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Omnidirectional Measurements of Angle-Resolved Heat Capacity for Complete Detection of Superconducting Gap Structure in the Heavy-Fermion Antiferromagnet UPd2Al3.
- Source :
-
Physical Review Letters . 7/15/2016, Vol. 117 Issue 3, p1-1. 1p. - Publication Year :
- 2016
-
Abstract
- Quasiparticle excitations in UPd2Al3 were studied by means of heat-capacity (C) measurements under rotating magnetic fields using a high-quality single crystal. The field dependence shows C(H)∞H1/2-like behavior at low temperatures for both two hexagonal crystal axes, i.e., H||[0001] (c axis) and H||[1120] (a axis), suggesting the presence of nodal quasiparticle excitations from heavy bands. At low temperatures, the polar-angle (?) dependence of C exhibits a maximum along H||[0001] with a twofold symmetric oscillation below 0.5 T, and an unusual shoulder or hump anomaly has been found around 30°-60° from the c axis in C(θ) at intermediate fields (1≲µ0H≲2T). These behaviors in UPd2Al3 purely come from the superconducting nodal quasiparticle excitations, and can be successfully reproduced by theoretical calculations assuming the gap symmetry with a horizontal linear line node. We demonstrate the whole angle-resolved heat-capacity measurements done here as a novel spectroscopic method for nodal gap determination, which can be applied to other exotic superconductors. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HEAT capacity
*HEAVY fermion superconductors
*ANTIFERROMAGNETISM
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 117
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 118978192
- Full Text :
- https://doi.org/10.1103/PhysRevLett.117.037001