TY - JOUR
T1 - (P, T) phase diagram of clathrate superconductor Ba24Ge 100
AU - Miyake, Atsushi
AU - Kagayama, Tomoko
AU - Shimizu, Katsuya
AU - Tang, Jun
AU - Tanigaki, Katsumi
PY - 2011
Y1 - 2011
N2 - Precise electrical resistivity and ac calorimetry measurements under pressures have revealed (P, T) phase diagram of superconducting clathrate Ba24Ge100. Following conventional superconducting theory, the pressure dependence of the density of state at Fermi energy, N(E F), estimated by the electronic specific heat C/T has been discussed with the Tc(P). Up to P= 2.1 GPa, where Tc(P) starts to saturate, C/T increases with Tc in agreement with the theory. On further compression, C/T is strongly suppressed while Tc slightly decreases. Across Pc ∼ 2.9 GPa, where structural deforming transitions at Ts1(s2) are suppressed, pressure variation of C/T becomes smaller. In addition to the enhancement of the N(EF), other changes in crystal and/or electrical structure may play important roles to pressure dependence of Tc in Ba24Ge100.
AB - Precise electrical resistivity and ac calorimetry measurements under pressures have revealed (P, T) phase diagram of superconducting clathrate Ba24Ge100. Following conventional superconducting theory, the pressure dependence of the density of state at Fermi energy, N(E F), estimated by the electronic specific heat C/T has been discussed with the Tc(P). Up to P= 2.1 GPa, where Tc(P) starts to saturate, C/T increases with Tc in agreement with the theory. On further compression, C/T is strongly suppressed while Tc slightly decreases. Across Pc ∼ 2.9 GPa, where structural deforming transitions at Ts1(s2) are suppressed, pressure variation of C/T becomes smaller. In addition to the enhancement of the N(EF), other changes in crystal and/or electrical structure may play important roles to pressure dependence of Tc in Ba24Ge100.
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U2 - 10.1088/1742-6596/273/1/012079
DO - 10.1088/1742-6596/273/1/012079
M3 - Article
AN - SCOPUS:79960708098
VL - 273
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012079
ER -