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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.23: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

In-plane upper critical field of d-wave superconductors — •Wang Jing-Rong^1,2, Liu Guo-Zhu¹, Ribeiro Pedro², and Kirchner Stefan^2,3 — ¹Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China — ²Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany — ³Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Determining the full gap symmetry of unconventional superconductors is an important but difficult task. One experimental method to determine the gap symmetry is to measure the angular dependence of the in-plane upper critical field. Due to their large effective mass, heavy fermion superconductors are usually Pauli limited but also orbital coupling contributes to H_c2. Recent experiments on CeCu₂Si₂ indicate that the in-plane upper critical field exhibits a number of interesting behaviors. Motivated by these experiments, we systematically study the angular independence of the upper critical field including both orbital coupling and Zeeman coupling. We compare our theoretical results with the relevant experiments[1].
[1] H. Vieyra et al. PRL 106, 207001 (2011).