TY - JOUR
T1 - Quasiparticle excitations and evidence for superconducting double transitions in monocrystalline U0.97Th0.03Be13
AU - Shimizu, Yusei
AU - Kittaka, Shunichiro
AU - Nakamura, Shota
AU - Sakakibara, Toshiro
AU - Aoki, Dai
AU - Homma, Yoshiya
AU - Nakamura, Ai
AU - Machida, Kazushige
N1 - Funding Information:
Acknowledgments. We greatly appreciate valuable discussions with M. Yokoyama, Y. Kono, Y. Haga, H. Amitsuka, and T. Yanagisawa. We also would like to thank K. Mochidzuki and K. Kindo for the use of the magnetic properties measurement system (Quantum Design, Inc.) and their support. Y.S. would like to acknowledge all the support from Institute for Materials Research, Tohoku University in growing monocrystalline samples using the joint research facility at Oarai. The present work was supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas “J-Physics” (Grants No. 15H05883, No. 15H05884, and No. 15K05882) from MEXT, and KAKENHI (Grants No. 15H03682, No. 15H05745, No. 15K05158, No. 16H04006, No. 26400360, and No. 17K14328).
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/9/18
Y1 - 2017/9/18
N2 - Superconducting (SC) gap symmetry and magnetic response of cubic U0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dc magnetization measurements using a single crystal, in order to address the long-standing question of its second phase transition at Tc2 in the SC state below Tc1. The absence (presence) of an anomaly at Tc2 in the field-cooling (zero-field-cooling) magnetization indicates that this transition is between two different SC states. There is a qualitative difference in the field variation of the transition temperatures; Tc2(H) is isotropic, whereas Tc1(H) exhibits a weak anisotropy between the [001] and [111] directions. In the low-temperature phase below Tc2(H), the angle-resolved heat capacity C(T,H,φ) reveals that the gap is fully opened over the Fermi surface, narrowing down the possible gap symmetry.
AB - Superconducting (SC) gap symmetry and magnetic response of cubic U0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dc magnetization measurements using a single crystal, in order to address the long-standing question of its second phase transition at Tc2 in the SC state below Tc1. The absence (presence) of an anomaly at Tc2 in the field-cooling (zero-field-cooling) magnetization indicates that this transition is between two different SC states. There is a qualitative difference in the field variation of the transition temperatures; Tc2(H) is isotropic, whereas Tc1(H) exhibits a weak anisotropy between the [001] and [111] directions. In the low-temperature phase below Tc2(H), the angle-resolved heat capacity C(T,H,φ) reveals that the gap is fully opened over the Fermi surface, narrowing down the possible gap symmetry.
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U2 - 10.1103/PhysRevB.96.100505
DO - 10.1103/PhysRevB.96.100505
M3 - Article
AN - SCOPUS:85029932611
VL - 96
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 10
M1 - 100505
ER -