Yoshida, T., Hashimoto, M., Ideta, S., Fujimori, A., Tanaka, K., Mannella, N., ...
We have investigated the doping and temperature dependences of the pseudogap/superconducting gap in the single-layer cuprate La$_{2-x}$Sr$_x$CuO$_4$ by angle-resolved photoemission spectroscopy. The...
Appearance of Universal Metallic Dispersion in a Doped Mott Insulator (2008)
Sahrakorpi, S., Markiewicz, R. S., Lin, Hsin, Lindroos, M., Zhou, X. J., Yoshida, T., ...
We have investigated the dispersion renormalization $Z_{disp}$ in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) over the wide doping range of $x=0.03-0.30$, for binding energies extending to several hundred meV's....
AC and DC Conductivity Anisotropies in Lightly Doped La(2-x)Sr(x)CuO(4) (2008)
Neto, M. B. Silva, Blumberg, G., Gozar, A., Komiya, Seiki, Ando, Yoichi
The AC and DC conductivity anisotropies in the low temperature orthorhombic phase of lightly doped La(2-x)Sr(x)CuO(4) are ascribed to the rotational symmetry broken, localized impurity states...
Pasupathy, Abhay N., Pushp, Aakash, Gomes, Kenjiro K., Parker, Colin V., Wen, Jinsheng, Xu, Zhijun, ...
Identifying the mechanism of superconductivity in the high-temperature cuprate superconductors is one of the major outstanding problems in physics. We report local measurements of the onset of...
Universal critical behavior in single crystals and films of YBa$_2$Cu$_3$O$_{7-\delta}$ (2008)
Li, Su, Xu, Hua, Sullivan, M. C., Segawa, Kouji, Ando, Yoichi, Anlage, Steven M., ...
We have studied the normal-superconducting phase transition in optimally-doped YBa$_2$Cu$_3$O$_{7-\delta}$ in zero external magnetic field using dc transport measurements. We find consistent values...
Hashimoto, M., Yoshida, T., Yagi, H., Takizawa, M., Fujimori, A., Kubota, M., ...
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of the single-layer cuprate Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ (Bi2201) and revealed the doping evolution...
Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals (2008)
Sun, X. F., Taskin, A. A., Zhao, X., Lavrov, A. N., Ando, Yoichi
To study the effects of paramagnetic spins on phonons, both the in-plane and the c-axis heat transport of GdBaCo_{2}O_{5+x} (GBCO) single crystals are measured at low temperature down to 0.36 K and...
Quantum Spin Excitations through the metal-to-insulator crossover in $Y Ba_2 Cu_3 O_{6+y}$ (2007)
Li, Shiliang, Yamani, Zahra, Kang, Hye Jung, Segawa, Kouji, Ando, Yoichi, Yao, Xin, ...
We use inelastic neutron scattering to study the temperature dependence of the spin excitations of a detwinned superconducting YBa$_2$Cu$_3$O$_{6.45}$ ($T_c=48$ K). In contrast to earlier work on...
In a recent Letter [Phys. Rev. Lett. 97, 207001 (2006)], Doiron-Leyraud et al. reported a study of low-temperature thermal conductivity of underdoped YBa2Cu3Oy across the superconductor-insulator...
Implication of the Mott-limit violation in high-Tc cuprates (2007)
The Fermi arc is a striking manifestation of the strong-correlation physics in high-T_c cuprates. In this paper, implications of the metallic transport in the lightly hole-doped regime of the...
Pitfalls in the analysis of low-temperature thermal conductivity of high-Tc cuprates (2007)
Ando, Yoichi, Sun, X. F., Segawa, Kouji
Recently, it was proposed that phonons are specularly reflected below about 0.5 K in ordinary single-crystal samples of high-T_c cuprates, and that the low-temperature thermal conductivity should be...
Quantum Phase Transition in the Normal State of High-Tc Cuprates at Optimum Doping (2007)
Balakirev, F. F., Betts, J. B., Migliori, A., Tsukada, I., Ando, Yoichi, Boebinger, G. S.
By using a 60 T magnetic field to suppress superconductivity in La2-pSrpCuO4, (LSCO) we reveal an anomalous peak in the Hall number, located at optimum doping and developing at temperatures below the...
Observation of a 500meV Collective Mode in La$_{2-x}$Sr$_x$CuO$_4$ and Nd$_2$CuO$_4$ (2007)
Hill, J. P., Blumberg, G., Kim, Young-June, Ellis, D., Wakimoto, S., Birgeneau, R. J., ...
Utilizing resonant inelastic x-ray scattering, we report a previously unobserved mode in the excitation spectrum of La$_{2-x}$Sr$_x$CuO$_4$ at 500 meV. The mode is peaked around the ($\pi$,0) point...
Peculiar Ferrimagnetism Associated with Charge Order in Layered Perovskite GdBaMn2O5 (2007)
The magnetic properties of GdBaMn_{2}O_{5.0}, which exhibits charge ordering, are studied from 2 to 400 K using single crystals. In a small magnetic field applied along the easy axis, the...
Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+d (2007)
Gomes, Kenjiro K., Pasupathy, Abhay N., Pushp, Aakash, Ono, Shimpei, Ando, Yoichi, Yazdani, Ali
Pairing of electrons in conventional superconductors occurs at the superconducting transition temperature Tc, creating an energy gap D in the electronic density of states (DOS). In the high-Tc...
Disparities in the Josephson vortex state electrodynamics of high-Tc cuprates (2007)
LaForge, A. D., Padilla, W. J., Burch, K. S., Li, Z. Q., Dordevic, S. V., Segawa, Kouji, ...
We report on far infrared measurements of interplane conductivity for underdoped single-crystal YBa2Cu3Oy in magnetic field and situate these new data within earlier work on two other high-Tc cuprate...
Online Supplementary Material: Low temperature vortex liquid in $\rm La_{2-x}Sr_xCuO_4$ (2007)
Li, Lu, Checkelsky, J. G., Komiya, Seiki, Ando, Yoichi, Ong, N. P.
We report here the supplementary material for Ref. [1]. Using torque magnetometry, we measured the magnetization anisotropy of 7 crystals of $\rm La_{2-x}Sr_xCuO_4$ (LSCO). In optimally-doped...
Low temperature vortex liquid in $\rm La_{2-x}Sr_xCuO_4$ (2007)
Li, Lu, Checkelsky, J. G., Komiya, Seiki, Ando, Yoichi, Ong, N. P.
In the cuprates, the lightly-doped region is of major interest because superconductivity, antiferromagnetism, and the pseudogap state \cite{Timusk,Lee,Anderson} come together near a critical doping...
Kang, Hye Jung, Dai, Pengcheng, Campbell, Branton J., Chupas, Peter J., Rosenkranz, Stephan, Lee, Peter L., ...
High-transition-temperature superconductivity arises in copper oxides when holes or electrons are doped into the CuO2 planes of their insulating parent compounds. While hole-doping quickly induces...
Magnetization, Nernst effect and vorticity in the cuprates (2006)
Li, Lu, Wang, Yayu, Naughton, M. J., Komiya, Seiki, Ono, Shimpei, Ando, Yoichi, ...
Nernst and magnetization experiments reveal the existence of a large region of the cuprate phase diagram above the $T_c$ curve in which vorticity and weak diamagnetism exist without phase coherence....
Yoshida, T., Zhou, X. J., Lu, D. H., Komiya, Seiki, Ando, Yoichi, Eisaki, H., ...
We have performed a systematic angle-resolved photoemission spectroscopy (ARPES) study of the high-Tc cuprates La2-xSrxCuO4, ranging from the underdoped insulator to the superconductor to the...
Depairing field, onset temperature and the nature of the transition in cuprates (2006)
Li, Lu, Wang, Yayu, Checkelsky, J. G., Naughton, M. J., Komiya, Seiki, Ono, Shimpei, ...
The depairing (upper critical) field $H_{c2}$ in hole-doped cuprates has been inferred from magnetization curves $M$-$H$ measured by torque magnetometry in fields $H$ up to 45 T. We discuss the...
Ono, S., Komiya, Seiki, Ando, Yoichi
By measuring the Hall coefficient R_H up to 1000 K in La_2CuO_4, Pr_{1.3}La_{0.7}CuO_4, and La_{2-x}Sr_xCuO_4 (LSCO), we found that the temperature (T) dependence of R_H in LSCO for x = 0 - 0.05 at...
Wilson, Stephen D., Li, Shiliang, Dai, Pengcheng, Bao, Wei, Chung, Jae-Ho, Kang, H. J., ...
We use inelastic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate Pr0.88LaCe0.12CuO4-d (PLCCO) as the system is tuned from its...
Doping n-type carriers by La-substitution for Ba in YBa_2Cu_3O_y system (2006)
Thus far, there is no cuprate system where both n-type and p-type charge carriers can be doped without changing the crystallographic structure. For studying the electron-hole symmetry in an identical...
Wilson, Stephen D., Li, Shiliang, Woo, H., Dai, Pengcheng, Mook, H. A., Frost, C. D., ...
We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of electron-doped superconducting Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-\delta}$ ($T_c=21\pm 1$ K) over...
Benfatto, L., Neto, M. B. Silva, Gozar, A., Dennis, B. S., Blumberg, G., Miller, L. L., ...
We compare the theoretical predictions of the previous article [L. Benfatto and M. B. Silva Neto, cond-mat/0602419], with Raman spectroscopy experiments in Sr(2)CuO(2)Cl(2) and untwinned La(2)CuO(4)...
Origin of the large thermoelectric power in oxygen-variable RBaCo_{2}O_{5+x} (R=Gd, Nd) (2006)
Taskin, A. A., Lavrov, A. N., Ando, Yoichi
Thermoelectric properties of GdBaCo_{2}O_{5+x} and NdBaCo_{2}O_{5+x} single crystals have been studied upon continuous doping of CoO_2 planes with either electrons or holes. The thermoelectric...
Crystal structure and high-field magnetism of La2CuO4 (2006)
Reehuis, M., Ulrich, C., Prokes, K., Gozar, A., Blumberg, G., Komiya, Seiki, ...
Neutron diffraction was used to determine the crystal structure and magnetic ordering pattern of a La2CuO4 single crystal, with and without applied magnetic field. A previously unreported, subtle...
Strong-coupling Effects in cuprate High-$T_{c}$ Superconductors by magnetooptical studies (2005)
Lee, Y. S., Li, Z. Q., Padilla, W. J., Dordevic, S. V., Homes, C. C., Segawa, Kouji, ...
Signatures of strong coupling effects in cuprate high-$T_{c}$ superconductors have been authenticated through a variety of spectroscopic probes. However, the microscopic nature of relevant...
Sun, X. F., Ono, S., Abe, Yasushi, Komiya, Seiki, Segawa, Kouji, Ando, Yoichi
We report systematic, high-precision measurements of the low-T (down to 70 mK) thermal conductivity \kappa of YBa_{2}Cu_{3}O_{y}, La_{2-x}Sr_{x}CuO_{4} and Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}. Careful...
Infrared Hall effect in underdoped and optimally doped LSCO (2005)
Shi, L., Schmadel, D., Drew, H. D., Tsukada, I., Ando, Yoichi
We report a study of magneto-optical properties in the mid-infrared region of a series of La$_{2-x}$Sr$_x$CuO$_4$ samples with hole doping level ranging from severely underdoped ($x=0.03$)to...
Constituents of the "kink" in high-Tc cuprates (2005)
Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Geck, J., Knupfer, M., Fink, J., ...
Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in details the formation of the quasiparticle spectrum along the nodal direction of high-Tc cuprates. The heavily...
Doping Evolution of the Underlying Fermi Surface in La2-xSrxCuO4 (2005)
Yoshida, T., Zhou, X. J., Tanaka, K., Yang, W. L., Hussain, Z., ...
We have performed a systematic doping dependent study of La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) (0.03$\leq x \leq$0.3) by angle-resolved photoemission spectroscopy. In the entire doping range, the underlying...
Magnetic and Charge Correlations in La{2-x-y}Nd_ySr_xCuO_4: Raman Scattering Study (2005)
Gozar, A., Komiya, Seiki, Ando, Yoichi, Blumberg, G.
Two aspects in connection with the magnetic properties of La_{2-x-y}Nd_ySr_xCuO_4 single crystals are discussed. The first is related to long wavelength magnetic excitations in x = 0, 0.01, and 0.03...
In RBaCo_{2}O_{5+x} compounds (R is rare earth) variability of the oxygen content allows precise doping of CoO_2 planes with both types of charge carriers. We study transport properties of doped...
Constant effective mass across the phase diagram of high-T$_{c}$ cuprates (2005)
Padilla, W. J., Lee, Y. S., Dumm, M., Blumberg, G., Ono, S., Segawa, Kouji, ...
We investigate the hole dynamics in two prototypical high temperature superconducting systems: La$_{2-x}$Sr$_{x}$CuO$_{4}$ and YBa$_{2}$Cu$_{3}% $O$_{y}$ using a combination of DC transport and...
Gedik, N., Langner, M., Orenstein, J., Ono, S., Abe, Yasushi, Ando, Yoichi
We report time-resolved measurements of the photoinduced change in reflectivity, DeltaR, in the Bi2Sr2Ca1-yDyyCu2O8+delta (BSCCO) system of cuprate superconductors as a function of hole...
Electrodynamics of the Nodal Metal in Weakly Doped High-$T_{c}$ Cuprates (2005)
Lee, Y. S., Segawa, Kouji, Li, Z. Q., Padilla, W. J., Dumm, M., Dordevic, S. V., ...
We report on the detailed analysis of the infrared (IR) conductivity of two prototypical high-$T_{c}$ systems YBa$_{2}$Cu$_{3}$O$_{y}$ and La$_{2-x}$Sr$%_{x}$CuO$_{4}$ throughout the complex phase...
Strongly nonlinear magnetization above $T_c$ in $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ (2005)
Li, Lu, Wang, Yayu, Naughton, M. J., Ono, S., Ando, Yoichi, Ong, N. P.
Using high-resolution magnetometry we have investigated in detail the magnetization $M$ above the critical temperature $T_c$ in $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$. In a broad range of temperature $T$...
Infrared signatures of hole and spin stripes in La{2-x}Sr{x}CuO{4} (2005)
Padilla, W. J., Dumm, M., Komiya, Seiki, Ando, Yoichi, Basov, D. N.
We investigate the hole and lattice dynamics in a prototypical high temperature superconducting system La{2-x}Sr{x}CuO{4} using infrared spectroscopy. By exploring the anisotropy in the electronic...
Lee, Y. S., Segawa, Kouji, Ando, Yoichi, Basov, D. N.
We report the infrared (IR) response of Cu-O chains in the high-$T_{c}$ superconductor YBa$_{2}$Cu$_{3}$O$_{y}$ over the doping range spanning $% y=6.28-6.75$. We find evidence for a power law...
Gedik, N., Orenstein, J., Ono, S., Abe, Yasushi, Ando, Yoichi
We report time-resolved measurements of the photoinduced change in reflectivity, Delta R, in the Bi2Sr2Ca(1-y)Dy(y)Cu2O(8+delta) (BSCCO) system of cuprate superconductors as a function of hole...
Kang, H. J., Dai, Pengcheng, Mook, H. A., Argyriou, D. N., Sikolenko, V., Lynn, J. W., ...
We present comprehensive neutron scattering studies of nonsuperconducting and superconducting electron-doped Pr0.88LaCe0.12CuO4(PLCCO). At zero field, the transition from antiferromagnetic (AF)...
Sun, X. F., Tsukada, I., Suzuki, T., Komiya, Seiki, Ando, Yoichi
The magnetic-field (H) dependence of the thermal conductivity \kappa of Pr_{1.3}La_{0.7}CuO_4 is found to show a pronounced minimum for in-plane fields at low temperature, which is best attributed to...
Sun, X. F., Segawa, Kouji, Ando, Yoichi
In-plane transport properties of nonsuperconducting YBa_{2}Cu_{3}O_{y} (y = 6.35) are measured using high-quality untwinned single crystals. We find that both the a- and b-axis resistivities show...
Zhou, X. J., Shi, Junren, Yang, W. L., Komiya, Seiki, Ando, Yoichi, Plummer, W., ...
From consistency among different measurements, new measurements with better energy resolution, as well as simulations, we show that the fine structure we have identified in the electron self-enery of...
Taskin, A. A., Lavrov, A. N., Ando, Yoichi
Single crystals of the layered perovskite GdBaCo_{2}O_{5+x} (GBCO) have been grown by the floating-zone method, and their transport, magnetic, and structural properties have been studied in detail...
Achieving fast oxygen diffusion in perovskites by cation ordering (2005)
Taskin, A. A., Lavrov, A. N., Ando, Yoichi
The oxygen-exchange behavior has been studied in half-doped manganese and cobalt perovskite oxides. We have found that the oxygen diffusivity in Gd_{0.5}Ba_{0.5}MnO_{3-\delta} can be enhanced by...
Dai, Pengcheng, Kang, H. J., Mook, H. A., Matsuura, M., Lynn, J. W., Kurita, Y., ...
We use neutron scattering to demonstrate that electron-doped superconducting Pr0.88LaCe0.12CuO4 in the underdoped regime is electronically phase separated in the ground state, showing the coexistence...
Electron Localization in La_{2-x}Sr_xCuO_4 and the Role of Stripes (2004)
The normal-state in-plane resistivity (\rho_{ab}) is measured in lightly Zn-doped La_{2-x}Sr_xCuO_4 (LSCO) crystals with 0.06 \leq x \leq 0.17 to systematically study the localization behavior. It is...
Ono, S., Ando, Yoichi, Balakirev, F. F., Betts, J. B., Boebinger, G. S.
We measure the magnetic-field dependence of the c-axis resistivity, \rho_c(H), in a series of Bi_{2}Sr_{2-x}La_xCuO_{6+\delta} (BSLCO) single crystals for a wide range of doping using pulsed magnetic...
Ono, S., Komiya, Seiki, Lavrov, A. N., Ando, Yoichi, Balakirev, F. F., Betts, J. B., ...
The magnetoresistance (MR) in the in-plane resistivity is measured in magnetic fields up to 55 T in lightly doped La_{2-x}Sr_{x}CuO_{4} in the N\'eel state (x = 0.01) and in the spin-glass state (x =...
Magic Doping Fractions in High-Temperature Superconductors (2004)
Komiya, Seiki, Chen, Han-Dong, Zhang, Shou-Cheng, Ando, Yoichi
We report hole-doping dependence of the in-plane resistivity \rho_{ab} in a cuprate superconductor La_{2-x}Sr_{x}CuO_{4}, carefully examined using a series of high-quality single crystals. Our...
Segawa, Kouji, Ando, Yoichi, Basov, D. N.
We report on an infrared study of carrier dynamics within the CuO$_{2}$ planes in heavily underdoped detwinned single crystals of YBa$_{2}$Cu$_{3}$O$% _{y}$. In an effort to reveal the electronic...
Magnetic order in lightly doped La_{2-x}Sr_{x}CuO_{4} (2004)
Gozar, A., Dennis, B. S., Blumberg, G., Komiya, Seiki, Ando, Yoichi
We study long wavelength magnetic excitations in lightly doped La_{2-x}Sr_{x}CuO_{4} (x < 0.03) detwinned crystals. The lowest energy magnetic anisotropy induced gap can be understood in terms of the...
Molecular orbital excitations in cuprates (2004)
Kim, Young-June, Hill, J. P., Gu, G. D., Chou, F. C., Wakimoto, S., Birgeneau, R. J., ...
We report resonant inelastic x-ray scattering studies of electronic excitations in a wide variety of cuprate compounds. Specifically, we focus on the charge-transfer type excitation of an electron...
Wen, Hai-Hu, Liu, Zhi-Yong, Zhou, Fang, Xiong, Jiwu, Ti, Wenxing, Xiang, Tao, ...
Low temperature specific heat has been measured and extensively analyzed on a series of $La_{2-x}Sr_xCuO_4$ single crystals from underdoped to overdoped regime. From these data the quasiparticle...
Multiple Bosonic Mode Coupling in Electron Self-Energy of (La_2-xSr_x)CuO_4 (2004)
Zhou, X. J., Shi, Junren, Yoshida, T., Cuk, T., Yang, W. L., Brouet, V., ...
High resolution angle-resolved photoemission spectroscopy data along the (0,0)-($\pi$,$\pi$) nodal direction with significantly improved statistics reveal fine structure in the electron self-energy...
Doping dependence of charge-transfer excitations in La_{2-x}Sr_xCuO_4 (2004)
Kim, Young-June, Hill, J. P., Komiya, Seiki, Ando, Yoichi, Casa, D., Gog, T., ...
We report a resonant inelastic x-ray scattering (RIXS) study of the doping dependence of charge-transfer excitations in $\rm La_{2-x}Sr_xCuO_4$. The mome ntum dependence of these charge excitations...
A novel heavy-fermion state in CaCu_3Ru_4O12 (2004)
Kobayashi, W., Terasaki, I., Takeya, J., Tsukada, I., Ando, Yoichi
We have measured susceptibility, specific heat, resistivity, and thermopower of CaCu$_3$Ti$_{4-x}$Ru$_x$O$_{12}$ and CaCu$_{3-y}$Mn$_y$Ru$_4$O$_{12}$, and have found that CaCu$_3$Ru$_4$O$_{12}$ can...
Lavrov, A. N., Kang, H. J., Kurita, Y., Suzuki, T., Komiya, Seiki, Lynn, J. W., ...
We use transport and neutron-scattering measurements to show that a magnetic-field-induced transition from noncollinear to collinear spin arrangement in adjacent CuO_{2} planes of lightly...
Universal scaling relation in high-temperature superconductors (2004)
Homes, C. C., Dordevic, S. V., Strongin, M., Bonn, D. A., Liang, Ruixing, Hardy, W. N., ...
Scaling laws express a systematic and universal simplicity among complex systems in nature. For example, such laws are of enormous significance in biology. Scaling relations are also important in the...