Superconductivity in heavily boron-doped silicon carbide (2008)
Kriener, M., Muranaka, T., Kato, J., Ren, Z. A., Akimitsu, J., Maeno, Y.
The discoveries of superconductivity in heavily boron-doped diamond (C:B) in 2004 and silicon (Si:B) in 2006 renew the interest in the superconducting state of semiconductors. Charge-carrier doping...
Kittaka, S., Yonezawa, S., Yaguchi, H., Maeno, Y., Fittipaldi, R., Vecchione, A., ...
Although Sr3Ru2O7 has not been reported to exhibit superconductivity so far, ac susceptibility measurements revealed multiple superconducting transitions occurring in the Sr3Ru2O7 region cut from...
Superconductivity of hexagonal heavily-boron doped silicon carbide (2008)
Kriener, M., Muranaka, T., Kato, J., Akimitsu, J., Maeno, Y.
In 2004 the discovery of superconductivity in heavily boron-doped diamond (C:B) led to an increasing interest in the superconducting phases of wide-gap semiconductors. Subsequently superconductivity...
High Field ESR in the Two-Dimensional Triangular Lattice Antiferromagnet NiGa2S4 (2008)
Yamaguchi, H., Kimura, S., Hagiwara, M., Nambu, Y., Nakatsuji, S., Maeno, Y., ...
In this Letter, we report the results of ESR measurements in high magnetic fields up to about 53 T on single crystals of NiGa2S4 to clarify the spin dynamics in more detail. We have found that the...
Cleaving-temperature dependence of layered-oxide surfaces (2008)
Pennec, Y., Ingle, N. J. C., Elfimov, I. S, Varene, E., Damascelli, A., Barth, J. V., ...
The surfaces generated by cleaving non-polar, two-dimensional oxides are often considered to be perfect or ideal. However, single particle spectroscopies on Sr2RuO4, an archetypal non-polar two...
High-temperature spin relaxation process in Dy$_2$Ti$_2$O$_7$ probed by $^{47}$Ti-NQR (2008)
Kitagawa, K., Higashinaka, R., Ishida, K., Maeno, Y., Takigawa, M.
We have performed nuclear quadrupole resonance (NQR) experiments on $^{47}$Ti nuclei in Dy$_2$Ti$_2$O$_7$ in the temperature range 70 -- 300 K in order to investigate the dynamics of $4f$ electrons...
Anomalous In-Plane Anisotropy of the Onset of Superconductivity in (TMTSF)2ClO4 (2008)
Yonezawa, Shingo, Kusaba, S, Maeno, Y, Auban-Senzier, P, Pasquier, C, Bechgaard, K, ...
Specific heat and electronic states of superconducting boron-doped silicon carbide (2008)
Kriener, M., Maeno, Y., Oguchi, T., Kato, J., Muranaka, T., ...
The discoveries of superconductivity in the heavily-boron doped semiconductors diamond (C:B) in 2004 and silicon (Si:B) in 2006 have renewed the interest in the physics of the superconducting state...
Anomalous In-Plane Anisotropy of the Onset of Superconductivity in (TMTSF)2ClO4 (2008)
Yonezawa, Shingo, Kusaba, S., Maeno, Y., Auban-Senzier, P., Pasquier, C., Bechgaard, K., ...
We report the magnetic field-amplitude and field-angle dependence of the superconducting onset temperature Tc_onset of the organic superconductor (TMTSF)2ClO4 in magnetic fields H accurately aligned...
Takeya, H., Ishida, K., Kitagawa, K., Ihara, Y., Onuma, K., Maeno, Y., ...
We have performed $^{69,71}$Ga nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) and muon spin rotation/resonance on the quasi two-dimensional antiferromagnet (AFM)...
Superconductivity in Sr2RuO4-Sr3Ru2O7 eutectic crystals (2007)
Fittipaldi, R., Vecchione, A., Ciancio, R., Pace, S., Cuoco, M., Stornaiuolo, D., ...
Superconducting behavior has been observed in the Sr2RuO4-Sr3Ru2O7 eutectic system as grown by the flux-feeding floating zone technique. A supercurrent flows across a single interface between Sr2RuO4...
Uruma, M., Sekiyama, A., Fujiwara, H., Yano, M., Fujita, H., Imada, S., ...
We report on experimental data of the three-dimensional bulk Fermi surfaces of the layered strongly correlated Ca1.5Sr0.5RuO4 system. The measurements have been performed by means of hn-depndent...
Takubo, K., Mizokawa, T., Nambu, Y., Onuma, K., Tonomura, H., ...
We have studied the electronic structure of the Ni triangular lattice in NiGa$_2$S$_4$ using photoemission spectroscopy and subsequent model calculations. The cluster-model analysis of the Ni 2$p$...
Upper limit on spontaneous supercurrents in Sr$_2$RuO$_4$ (2007)
Kirtley, J. R., Kallin, C., Hicks, C. W., Liu, Y., Moler, K. A., ...
It is widely believed that the perovskite Sr$_2$RuO$_4$ is an unconventional superconductor with broken time reversal symmetry. It has been predicted that superconductors with broken time reversal...
Field-induced paramagnons at the metamagnetic transition in Ca1.8Sr0.2RuO4 (2007)
Steffens, P., Sidis, Y., Link, P., Schmalzl, K., Nakatsuji, S., Maeno, Y., ...
The magnetic excitations in Ca1.8Sr0.2RuO4 were studied across the metamagnetic transition and as a function of temperature using inelastic neutron scattering. At low temperature and low magnetic...
Lattice dynamics and electron-phonon coupling in Sr2RuO4 (2007)
Braden, M., Reichardt, W., Sidis, Y., Mao, Z., Maeno, Y.
The lattice dynamics in Sr$_2$RuO$_4$ has been studied by inelastic neutron scattering combined with shell-model calculations. The in-plane bond-stretching modes in Sr$_2$RuO$_4$ exhibit a normal...
Magnetoelastic coupling across the metamagnetic transition in Ca2- x Sr x RuO4 (0.2 (2007)
Baier, J, Steffens, P, Schumann, O, Kriener, M, Stark, S, Hartmann, H, ...
Upper limit on spontaneous supercurrents in Sr2RuO4 (2007)
Kirtley, J.R., Kallin, C., Hicks, C.W., Liu, Y., Moler, K.A., ...
It is widely believed that the perovskite Sr2RuO4 is an unconventional superconductor with broken time-reversal symmetry. It has been predicted that superconductors with broken time-reversal symmetry...
Formation of a Nematic Fluid at High Fields in Sr3Ru2O7 (2006)
Borzi, R. A., Grigera, S. A., Farrell, J., Perry, R. S., Lister, S. J. S., Lee, S. L., ...
In principle, a complex assembly of strongly interacting electrons can self-organise into a wide variety of collective states, but relatively few such states have been identified in practice. We...
Baier, J., Steffens, P., Schumann, O., Kriener, M., Stark, S., Hartmann, H., ...
The magnetoelastic coupling in Ca$_{1.8}$Sr$_{0.2}$RuO$_4$ and in Ca$_{1.5}$Sr$_{0.5}$RuO$_4$ has been studied combining high-resolution dilatometer and diffraction techniques. Both compounds exhibit...
Spectroscopy of SrRuO/Ru Junctions in Eutectic (2006)
Yaguchi, H., Takizawa, K., Kawamura, M., Kikugawa, N., Maeno, Y., Meno, T., ...
We have investigated the tunnelling properties of the interface between superconducting Sr2RuO4 and a single Ru inclusion in eutectic. By using a micro-fabrication technique, we have made Sr2RuO4/Ru...
Orbital Properties of Sr3Ru2O7 and Related Ruthenates Probed by 17O-NMR (2006)
Kitagawa, K., Ishida, K., Perry, R. S., Murakawa, H., Yoshimura, K., Maeno, Y.
We report a site-separated $^{17}$O-NMR study of the layered perovskite ruthenate Sr$_3$Ru$_2$O$_7$, which exhibits nearly two-dimensional transport properties and itinerant metamagnetism at low...
Observation of a mixed pairing state in Ru microdomains embedded in $Sr_2 Ru O_4$ (2006)
Long, Z., Andreou, C., Mao, Z. Q., Yaguchi, H., Maeno, Y., Liu, Y.
We report first measurements on tunneling into the {\it interior} of a Ru microdomain embedded in bulk chiral p-wave superconductor Sr$_{2}$RuO$_{4}$. The junctions were prepared by pressing a pure...
Kittaka, S., Fusanobori, S., Yonezawa, S., Yaguchi, H., Maeno, Y., Fittipaldi, R., ...
We report superconducting properties of Sr3Ru2O7-Sr2RuO4 eutectic crystals, consisting of the spin-triplet superconductor Sr2RuO4 with a monolayer stacking of RuO2 planes and the metamagnetic normal...
Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir) (2006)
Moon, S. J., Kim, M. W., Kim, K. W., Lee, Y. S., ...
We investigated the electronic structures of the two-dimensional layered perovskite Sr$_{2}$\textit{M}O$_{4}$ (\textit{M}=4\textit{d} Ru, 4\textit{d} Rh, and 5\textit{d} Ir) using optical...
Mann, P. D. A., Sutherland, M., Bergemann, C., Yonezawa, S., Maeno, Y.
We measured the Fermi surface of the recently discovered superconductor Ag5Pb2O6 via a de Haas-van Alphen rotation study. Two frequency branches were observed and identified with the neck and belly...
Thermal conductivity in the vicinity of the quantum critical endpoint in Sr3Ru2O7 (2006)
Ronning, F., Hill, R. W., Sutherland, M., Hawthorn, D. G., Tanatar, M. A., Paglione, J., ...
Thermal conductivity of Sr3Ru2O7 was measured down to 40 mK and at magnetic fields through the quantum critical endpoint at H_c = 7.85 T. A peak in the electrical resistivity as a function of field...
Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice Pr2Ir2O7 (2006)
Nakatsuji, S, Machida, Y, Maeno, Y, Tayama, T, Sakakibara, T, Duijn, J Van, ...
Metamagnetic Quantum Criticality in Sr3Ru2O7 Studied by Thermal Expansion (2006)
Gegenwart, P., Weickert, F., Garst, M., Perry, R. S., Maeno, Y.
Beta-Detected NQR in Zero Field with a Low Energy Beam of \nuc{8}{Li}$^+$ (2005)
Salman, Z., Kiefl, R. F., Chow, K. H., MacFarlane, W. A., Arseneau, D. J., Daviel, S., ...
Beta-detected nuclear quadrupole resonances (\bnqr) at zero field are observed using a beam of low energy highly polarized radioactive \nuc{8}{Li}$^+$. The resonances were detected in SrTiO$_3$,...
Thermodynamic Properties of (Ca,Sr)$_2$RuO$_4$ in Magnetic Fields (2005)
Baier, J., Zabel, T., Kriener, M., Steffens, P., Schumann, O., Friedt, O., ...
We have studied the influence of a magnetic field on the thermodynamic properties of Ca$_{2-x}$Sr$_{x}$RuO$_4$ in the intermediate metallic region with tilt and rotational distortions ($0.2\leq x...
Orbital ordering transition in Ca$_2$RuO$_4$ observed with resonant x-ray diffraction (2005)
Zegkinoglou, I., Strempfer, J., Nelson, C. S., Hill, J. P., Chakhalian, J., Bernhard, C., ...
Resonant x-ray diffraction performed at the $\rm L_{II}$ and $\rm L_{III}$ absorption edges of Ru has been used to investigate the magnetic and orbital ordering in Ca$_2$RuO$_4$ single crystals. A...
Ingle, N. J. C., Shen, K. M., Baumberger, F., Meevasana, W., Lu, D. H., Shen, Z. X., ...
ARPES spectra hold a wealth of information about the many-body interactions in a correlated material. However, the quantitative analysis of ARPES spectra to extract the various coupling parameters in...
Balicas, L., Nakatsuji, S., Hall, D., Lee, H., Fisk, Z., Maeno, Y., ...
We report an electrical transport study in Ca$_{2-x}$Sr$_{x}$RuO$_4$ single crystals at high magnetic fields ($B$). For $x =0.2$, the Hall constant $R_{xy}$ decreases sharply at an anisotropic...
Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion (2005)
Gegenwart, P., Weickert, F., Garst, M., Perry, R. S., Maeno, Y.
We report low-temperature thermal expansion measurements on the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ as a function of magnetic field applied perpendicular to the Ruthenium-oxide planes. The...
Lee, J. S., Moon, S. J., Noh, T. W., Nakatsuji, S., Maeno, Y.
We investigated optical spectra of quasi-two-dimensional multi-band Ca$% _{2-x} $Sr$_{x}$RuO$_{4}$ systems. The extended Drude model analysis on the ab-plane optical conductivity spectra indicates...
Lupien, C., Dutta, S. K., Barker, B. I., Maeno, Y., Davis, J. C.
Atomic-resolution scanning tunneling spectroscopy is used to study the spectrum of quasiparticle states in superconducting Sr2RuO4. The measured temperature dependence of the quasiparticle spectrum...
High pressure diffraction studies on Ca2RuO4 (2005)
Steffens, P., Friedt, O., Alireza, P., Marshall, W. G., Schmidt, W., Nakamura, F., ...
We studied the crystal and magnetic structure of Ca2RuO4 by different diffraction techniques under high pressure. The observed first order phase transition at moderate pressure (0.5 GPa) between the...
Lattice dynamics and the electron-phonon interaction in Ca$_2$RuO$_4$ (2005)
Rho, H., Cooper, S. L., Nakatsuji, S., Fukazawa, H., Maeno, Y.
We present a Raman scattering study of Ca$_2$RuO$_4$, in which we investigate the temperature-dependence of the lattice dynamics and the electron-phonon interaction below the metal-insulator...
High pressure diffraction studies on Ca2RuO4 (2005)
Steffens, P, Friedt, O, Alireza, P, Marshall, W G, Schmidt, W, Nakamura, F, ...
Braden, M, Friedt, O, Schumann, O, Baier, J, Steffens, P, Kriener, M, ...
Kriener, M, Steffens, P, Baier, J, Schumann, O, Zabel, T, Lorenz, T, ...
The crystal structure of Ca2-xSrxRuO4 with 0.2
Orbital Ordering Transition in Ca2RuO4 Observed with Resonant X-Ray Diffraction (2005)
Zegkinoglou, I., Strempfer, J., Nelson, C. S., Hill, J. P., Chakhalian, J., Bernhard, C., ...
High-pressure diffraction studies on Ca2RuO4 (2005)
Stephens, P., Friedt, O., Marshall, W.G., Schmidt, W., Nakamura, F., Nakatsuji, S., ...
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Disorder-Sensitive Phase Formation Linked to Metamagnetic Quantum Criticality (2004)
Grigera,S. A., Gegenwart,P., Borzi,R. A., Weickert,F., Schofield,A. J., Perry,R. S., ...
Kawamura, M., Yaguchi, H., Kikugawa, N., Maeno, Y., Takayanagi, H.
We have investigated the magnetic field and temperature dependence of the tunneling spectra of the eutectic system Sr2RuO4-Ru. Electric contacts to individual Ru lamellae embedded in Sr2RuO4 enable...
Low-Temperature Hall Effect in Substituted Sr2RuO4 (2004)
Kikugawa, N., Mackenzie, A. P., Bergemann, C., Maeno, Y.
We report the results of a study of the Hall effect and magnetoresistance in single crystals of Sr2RuO4 in which Sr^(2+) has been substituted by La^(3+) (Sr(2-y)La(y)RuO(4)) or Ru^(4+) by Ti^(4+)...
Mechanism of hopping transport in disordered Mott insulators (2004)
Nakatsuji, S., Dobrosavljevic, V., Tanaskovic, D., Minakata, M., Fukazawa, H., Maeno, Y.
By using a combination of detailed experimental studies and simple theoretical arguments, we identify a novel mechanism characterizing the hopping transport in the Mott insulating phase of...
Kriener, M., Steffens, P., Baier, J., Schumann, O., Zabel, T., Lorenz, T., ...
The crystal structure of Ca_{2-x}Sr_xRuO_4 with 0.2 < x < 1.0 has been studied by diffraction techniques and by high resolution capacitance dilatometry as a function of temperature and magnetic...
Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure Sr3Ru2O7 (2004)
Perry, RS, Kitagawa, K, Grigera, SA, Borzi, RA, Mackenzie, AP, Ishida, K, ...
Systematic approach to the growth of high-quality single-crystals of Sr3Ru2O7 (2004)
We describe a simple procedure for optimising the growth condition for high quality single crystals of the strontium ruthenate perovskites using an image furnace. The procedure involves carefully...
The de Haas-van Alphen effect across the metamagnetic transition in Sr$_3$Ru$_2$O$_7$ (2004)
Borzi, R. A., Grigera, S. A., Perry, R. S., Kikugawa, N., Kitagawa, K., Maeno, Y., ...
We report a study of the de Haas-van Alphen (dHvA) effect on the itinerant metamagnet Sr$_3$Ru$_2$O$_7$. Extremely high sample purity allows the observation of dHvA oscillations both above and below...
Rigid-Band Shift of the Fermi Level in a Strongly Correlated Metal: Sr(2-y)La(y)RuO(4) (2004)
Kikugawa, N., Mackenzie, A. P., Bergemann, C., Borzi, R. A., Grigera, S. A., Maeno, Y.
We report a systematic study of electron doping of Sr2RuO4 by non-isovalent substitution of La^(3+) for Sr^(2+). Using a combination of de Haas-van Alphen oscillations, specific heat, and resistivity...
Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure (2004)
Perry, R. S., Kitagawa, K., Grigera, S. A., Borzi, R. A., Mackenzie, A. P., Ishida, K., ...
We present measurements on ultra clean single crystals of the bilayered ruthenate metal Sr3Ru2O7, which has a magnetic-field-tuned quantum critical point. Quantum oscillations of differing...