Sun, X. F., Ono, S., Zhao, X., Pang, Z. Q., Abe, Y., Ando, Y.
The temperature and magnetic-field (H) dependences of thermal conductivity (\kappa) of Bi_2Sr_2CaCu_2O_{8+\delta} (Bi2212) are systematically measured for a broad doping range by using both pure...
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...
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...
Sonier, J. E., Callaghan, F. D., Ando, Y., Kiefl, R. F., Brewer, J. H., Kaiser, C. V., ...
Highly disordered magnetism confined to individual weakly interacting vortices is detected by muon spin rotation in two different families of high-transition-temperature superconductors, but only in...
Avoided Quantum Criticality in YBa_2Cu_3O_y and La_{2-x}Sr_xCuO_4 (2006)
Sonier, J. E., Callaghan, F. D., Ando, Y., Kiefl, R. F., Brewer, J. H., Kaiser, C. V., ...
Spin-glass magnetism confined to individual weakly interacting vortices is detected in two different families of high-transition-temperature (T_c) superconductors, but only in samples on the...
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...
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...
Sun, X. F., Segawa, Kouji, Ando, Yoichi
It was recently demonstrated that in La_{2-x}Sr_{x}CuO_{4} the magnetic-field (H) dependence of the low-temperature thermal conductivity \kappa up to 16 T reflects whether the normal state is a metal...
Quantum Phase Transitions in a Cuprate Superconductor Bi_{2}Sr_{2-x}La_{x}CuO_{6+\delta} (2004)
Ando, Yoichi, Ono, S., Sun, X. F., Takeya, J., Balakirev, F. F., Betts, J. B., ...
To elucidate a quantum phase transition (QPT) in Bi_2Sr_{2-x}La_xCuO_{6+\delta}, we measure charge and heat transport properties at very low temperatures and examine the following characteristics for...
Sun, X. F., Kurita, Y., Suzuki, T., Komiya, Seiki, Ando, Yoichi
It was recently demonstrated that the anisotropic phonon heat transport behavior is a good probe of the stripe formation in La_{2-x}Sr_xCuO_4 (LSCO) [X. F. Sun {\it et al.}, Phys. Rev. B {\bf 67},...
Ando, Yoichi, Sun, X. F., Takeya, J., Komiya, Seiki
In-plane and out-of-plane thermal conductivities (\kappa_{ab} and \kappa_{c}) are measured on single crystals of pure, 1%-hole-doped, and 1%-Zn-doped La_{2}CuO_{4}. The roles of magnons and the spin...
Sun, X. F., Komiya, Seiki, Ando, Yoichi
To study the rare-earth doping effect on the phonon heat transport of La-based cuprates and shed light on the mechanism of phonon scattering, both $ab$-plane and c-axis thermal conductivities...
Liu, Z. Y., Wen, H. H., Xiang, T., Komiya, Seiki, Sun, X. F., Ando, Yoichi
Low temperature specific heat has been measured for an overdoped $La_{2-x}Sr_xCuO_4$ (x = 0.22) single crystal. The quasiparticle density of states (DOS) in the mixed state is found to deviate from...
Sun, X. F., Komiya, Seiki, Takeya, J., Ando, Yoichi
Magnetic-field-induced ordering of electrons around vortices is a striking phenomenon recently found in high-$T_c$ cuprates. To identify its consequence in the quasiparticle dynamics, the...
Thermal conductivity of lightly Sr- and Zn-doped La$_2$CuO$_4$ single crystals (2003)
Sun, X. F., Takeya, J., Komiya, Seiki, Ando, Yoichi
Both ab-plane and c-axis thermal conductivities ($\kappa_{ab}$ and $\kappa_c$) of lightly doped La$_{2-x}$Sr$_x$CuO$_4$ and La$_2$Cu$_{1-y}$Zn$_y$O$_4$ single crystals ($x$ or $y$ = 0 -- 0.04) are...
Significant suppression of weak ferromagnetism in (La${}_{1.8}$Eu${}_{0.2}$)CuO${}_4$ (2002)
Tsukada, I., Sun, X. F., Komiya, Seiki, Lavrov, A. N., Ando, Yoichi
The magnetic structure of (La${}_{1.8}$Eu${}_{0.2}$)CuO${}_4$ has been studied by magnetization measurements of single crystals, which show antiferromagnetic long-range order below $T_N$ = 265 K and...
Ando, Yoichi, Takeya, J., Abe, Yasushi, Sun, X. F., Lavrov, A. N.
Since the nature of pairing interactions is manifested in the superconducting gap symmetry, the exact gap structure, particularly any deviation from the simple d_{x^2-y^2} symmetry, would help...
Komiya, Seiki, Ando, Yoichi, Sun, X. F., Lavrov, A. N.
Both the in-plane and the out-of-plane resistivities (\rho_{ab} and \rho_{c}) are measured in high-quality La_{2-x}Sr_{x}CuO_{4} (LSCO) single crystals in the lightly- to moderately-doped region, x =...
Takeya, J., Ando, Yoichi, Komiya, Seiki, Sun, X. F.
The thermal conductivity \kappa is measured in a series of La_{2-x}Sr_{x}CuO_{4} (x = 0 - 0.22) single crystals down to 90 mK to elucidate the evolution of the residual electronic thermal...
Ando, Yoichi, Lavrov, A. N., Komiya, Seiki, Segawa, Kouji, Sun, X. F.
The emergence and the evolution of the metallic charge transport in the La_{2-x}Sr_{x}CuO_{4} system from lightly- to optimally-doped samples (x = 0.01 - 0.17) are studied. We demonstrate that in...
Molecular and Crystal Engineering of Polydiacetylenes: Modification of Optical Properties. (1998)
Clough, S. B., Kumar, S, Sun, X. F., Tripathy, S., Matsuda, H.
Polydiacetylenes have attracted a great deal of attention over the past decade due to their interesting electronic and optical properties. It is also one of few classes of polymeric materials that...
Dynamics Simulation of Langmuir-Blodgett Films. (1998)
Clough, S. B., Sun, X. F., Kumar, J., Tripathy, S.
Langmuir-Blodgett film monolayers are formed when amphiphilic molecules in solution are deposited on water surface followed by compression. During the compression, the randomly oriented molecules...
Computer Simulation of Substituted Polyacatylenes. (1998)
Clough, S. B., Sun, X. F., Tipathy, S.
A wide variety of substituted polyacetylenes has been synthesized in recent years. Polyacetylene itself is a semiconductor with omega values as high as 10(-4) Scm(-1) for oriented films; when doped,...
Molecular Dynamics Simulation of Substituted Polyacetylenes. (1998)
Sun, X. F., Clough, S. B., Tripathy, S. K., Baker, G. L.
Molecular mechanics and molecular dynamics calculations have been applied to several substituted polyacetylenes. Results for the barrier height for single bond rotation for polyacetylene were...