384 citations · 889 across the 33 of their papers we have counts for
17 papers · 1 filter
Half-quantum flux in spin-triplet superconducting rings with bias current
Kazushi Aoyama
Effects of a bias electric current have been theoretically investigated in a spin-triplet superconducting ring in a magnetic field. Based on the Ginzburg-Landau theory, we show tha…
Little-Parks oscillation and -vector texture in spin-triplet superconducting rings with bias current
Kazushi Aoyama
We theoretically investigate the critical bias current for a superconducting (SC) ring in a magnetic field. Based on the Ginzburg-Landau theory, we show that exhibits a…
Surface scattering effect and the stripe order in films of the superfluid He B phase
Kazushi Aoyama
Surface scattering effects in thin films of the superfluid 3He B phase have been theoretically investigated, with an emphasis on the stability of the stripe order with spontaneous…
Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
S. Kasahara, T. Watashige, T. Hanaguri +13
Fermi systems in the crossover regime between weakly coupled Bardeen-Cooper-Schrieffer (BCS) and strongly coupled Bose-Einstein-condensate (BEC) limits are among the most fascinati…
Stripe order in superfluid 3He confined in narrow cylinders
Kazushi Aoyama
We theoretically investigate pairing states of the spin-triplet p-wave superfluid 3He confined in narrow cylinders. The surface-induced distortion and the multiple internal degrees…
Signatures of the Helical Phase in the Critical Fields at Twin Boundaries of Non-Centrosymmetric Superconductors
Kazushi Aoyama, Lucile Savary, Manfred Sigrist
Domains in non-centrosymmetric materials represent regions of different crystal structure and spin-orbit coupling. Twin boundaries separating such domains display unusual propertie…
Field-induced reentrant superconductivity in thin films of nodal superconductor
M. Hachiya, K. Aoyama, R. Ikeda
Previous works on nodal d-wave superconductors have shown that a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like modulated superconducting (SC) state can be realized with no magnetic…
Inhomogeneous Superconducting States of Mesoscopic Thin-Walled Cylinders in External Magnetic Fields
K. Aoyama, R. Beaird, D. E. Sheehy +1
We theoretically investigate the appearance of spatially modulated superconducting states in mesoscopic superconducting thin-wall cylinders in a magnetic field at low temperatures.…
Model for magnetic flux pattern induced by in-plane magnetic fields on spatially inhomogeneous superconducting interfaces of LaAlO_3-SrTiO_3
Kazushi Aoyama, Manfred Sigrist
The effect of spatial inhomogeneity on the properties of a two-dimensional non-centrosymmetric superconductor in an in-plane magnetic field is investigated, as it can be realized i…
Fluctuation and Order of Antiferromagnetism induced by Paramagnetic Pair-Breaking in Superconducting Vortex Lattice
Kazushi Aoyama, Ryusuke Ikeda
Effects of the strong Pauli-paramagnetic pair-breaking (PPB) on the vortex lattice in d-wave superconductors are theoretically studied by putting emphasis on consequences of the PP…
Vortex core transitions in superfluid 3He in globally anisotropic aerogels
Kazushi Aoyama, Ryusuke Ikeda
Core structures of a single vortex in A-like and B-like phases of superfluid 3He in uniaxially compressed and stretched aerogels are studied by numerically solving Ginzburg-Landau…
Antiferromagnetic ordering induced by paramagnetic depairing in unconventional superconductors
Ryusuke Ikeda, Yuhki Hatakeyama, Kazushi Aoyama
Antiferromagnetic (AFM) (or spin-density wave) quantum critical fluctuation enhanced just below H_c2(0) have been often observed in d-wave superconductors with a strong Pauli param…
Roles of Antiferromagnetic Fluctuation in High Field Phase Diagram of Superconductors with Strong Paramagnetic Depairing
Ryusuke Ikeda, Kazushi Aoyama
The high field phase diagram and magnetic properties of CeCoIn_5 below H_c2(0) are examined from the picture regarding the high field and low temperature (HFLT) phase as a possible…
Anisotropy-induced Vortex Core Transitions in Superfluid 3He in Aerogel
Kazushi Aoyama, Ryusuke Ikeda
Core structures of a single vortex in A-like and B-like phases of superfluid 3He in uniaxially compressed and stretched aerogels are studied by numerically solving Ginzburg-Landau…
Superfluid He in globally isotropic random media
Ryusuke Ikeda, Kazushi Aoyama
Recent theoretical and experimental studies of superfluid He in aerogels with a global anisotropy, e.g., due to an external stress, have definitely shown that the A-like phase…
Strong Coupling Correction in Superfluid He in Aerogel
Kazushi Aoyama, Ryusuke Ikeda
Effects of impurity scatterings on the strong coupling (SC) contribution, stabilizing the ABM (axial) pairing state, to the quartic term of the Ginzburg-Landau (GL) free energy of…
Equal-Spin Pairing State of Superfluid He in Aerogel
Kazushi Aoyama, Ryusuke Ikeda
The equal-spin pairing (ESP) state, the so-called A-like phase, of superfluid He in aerogels is studied theoretically in the Ginzburg-Landau (GL) region by examining thermodyna…