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17 papers · 1 filter
Fourth-Order Perturbation Expansion for Hubbard Model on a Two-Dimensional Square Lattice
H. Ikeda, S. Shinkai, K. Yamada
We investigate the Hubbard model on a two-dimensional square lattice by the perturbation expansion to the fourth order in the on-site Coulomb repulsion U. Numerically calculating a…
Spin Dynamics in Iron-based Layered Superconductor (La_{0.87}Ca_{0.13})FePO Revealed by ^{31}P and ^{139}La NMR Studies
Yusuke Nakai, Kenji Ishida, Yoichi Kamihara +2
We report ^{31}P and ^{139}La NMR studies of (La_{0.87}Ca_{0.13})FePO, which is a family member of the recently discovered superconductor LaFeAs(O_{1-x}F_x). In the normal state, K…
Entanglement of Solid Vortex Matter: A Boomerang Shaped Reduction Forced by Disorder in Interlayer Phase Coherence in Bi2Sr2CaCu2O8+y
T. Kato, T. Shibauchi, Y. Matsuda +2
We present evidence for entangled solid vortex matter in a glassy state in a layered superconductor BiSrCaCuO containing randomly splayed linear defects. The in…
Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors
T. Shibauchi, L. Krusin-Elbaum, M. Hasegawa +3
In high transition temperature (T_c) superconductivity, charge doping is a natural tuning parameter that takes copper oxides from the antiferromagnet to the superconducting region.…
Magnetic-Field Variations of the Pair-Breaking Effects of Superconductivity in (TMTSF)2ClO4
Shingo Yonezawa, Shuichi Kusaba, Yoshiteru Maeno +3
We have studied the onset temperature of the superconductivity Tc_onset of the organic superconductor (TMTSF)2ClO4, by precisely controlling the direction of the magnetic field H.…
Supersolid state of ultracold fermions in an optical lattice
Akihisa Koga, Takuji Higashiyama, Kensuke Inaba +2
We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by means of the dynamical mean-field approximation. It is demonstrated that a supersolid…