期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 76, 期 5, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.051004
关键词
heavy fermion system; anisotropic superconductor; nodal structure; specific heat measurement; Doppler shift effect; quasiparticles; zero energy density of states
Heavy electron superconductors mostly have anisotropic gap function which vanishes (has nodes) for certain directions in the momentum space. Since the nodal structure is closely related to the pairing mechanism, its experimental determination is very important. In anisotropic superconductors, low energy spectrum of the quasiparticles in the vortex state much depends on the nodal structure. In particular, the electronic specific heat has been demonstrated to exhibit the characteristic dependence on the angle between the field and the nodal direction, thereby the nodal structure can be probed experimentally. In this contribution, we present our recent experimental results on the field-orientation dependence of the specific heat on f electron superconductors CeRu2, CeCoIn5, PrOs4Sb12, and URu2Si2, and discuss their gap structures.
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