TY - JOUR
T1 - Nodal structures of heavy fermion superconductors probed by the specific-heat measurements in magnetic fields
AU - Sakakibara, Toshiro
AU - Yamada, Atsushi
AU - Custers, Jeroen
AU - Yano, Kazuhiro
AU - Tayama, Takashi
AU - Aoki, Hidekazu
AU - Machida, Kazushige
PY - 2007/5
Y1 - 2007/5
N2 - 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 CeRu 2, CeCoIn 5, PrOs 4Sb 12, and URu 2Si 2, and discuss their gap structures.
AB - 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 CeRu 2, CeCoIn 5, PrOs 4Sb 12, and URu 2Si 2, and discuss their gap structures.
KW - Anisotropic superconductor
KW - Doppler shift effect
KW - Heavy fermion system
KW - Nodal structure
KW - Quasiparticles
KW - Specific heat measurement
KW - Zero energy density of states
UR - http://www.scopus.com/inward/record.url?scp=34547490832&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.76.051004
DO - 10.1143/JPSJ.76.051004
M3 - 学術論文
AN - SCOPUS:34547490832
SN - 0031-9015
VL - 76
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 5
M1 - 051004
ER -