249 citations · 1.1k across the 47 of their papers we have counts for
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Pseudogap due to antiferromagnetic fluctuations and the phase diagram of the high temperature oxide superconductors
Hiroshi Shimahara, Yasumasa Hasegawa, Mahito Kohmoto
A reduction of the density of states near the Fermi energy in the normal state (pseudogap) of high-temperature oxide superconductors is examined on the basis of the two-dimensional…
Spin triplet superconductivity with line nodes in Sr2RuO4
Yasumasa Hasegawa, Kazushige Machida, Masa-aki Ozaki
Several possible odd-parity states are listed up group-theoretically and examined in light of recent experiments on SrRuO. Those include some of the -wave pairing states…
Spin Splitting in de Haas-van Alp-hen Oscillation in Two-Dimensional Two-Band Systems
Keita Kishigi, Yasumasa Hasegawa, Mitake Miyazaki
We study the effects of the Zeeman term on the de Haas van Alphen (dHvA) oscillation in two-dimensional two-band systems. We found that the Fourier transform amplitudes of the osci…
Possible Spin-Singlet Superconductivity in (TMTSF)2X: Superconducting Transition Temperature in a Magnetic Field
Mitake Miyazaki, Keita Kishigi, Yasumasa Hasegawa
We study the transition temperature Tc(H) of a quasi-one-dimensional (Q1D) superconductivity which is derived from the quantum effect of an electron motion in a strong magnetic fie…
Enhancement of de Haas-van Alphen Oscillation due to Spin in the Magnetic Breakdown System
Keita Kishigi, Yasumasa Hasegawa, Mitake Miyazaki
The effects of the Zeeman term on the de Haas-van Alphen oscillation is studied in the magnetic breakdown system. We find that the amplitude of the oscillation with the frequencies…
Superconductivity of Quasi-Two-Dimensional Tight-Binding Electrons in a Strong Magnetic Field
Mitake Miyazaki, Keita Kishigi, Yasumasa Hasegawa
We have investigated the transition temperature of superconductiv ity in quasi-two-dimensional (Q2D) tight-binding electrons in a strong magnetic field. When the mag…