μSR studies of intercalated HfNCl superconductor
| Autor: | I. M. Gat, Graeme Luke, Y. Fudamoto, R. H. Heffner, Yasutomo J. Uemura, S. Yamanaka, M. I. Larkin, K Itoh, Kenji M. Kojima, Jack Merrin, D. E. MacLaughlin |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Transition temperature Fermi energy Muon spin spectroscopy Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Transverse plane Effective mass (solid-state physics) Condensed Matter::Superconductivity Electrical and Electronic Engineering Penetration depth |
| Zdroj: | Physica B: Condensed Matter. :389-392 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(00)00418-x |
| Popis: | Muon spin relaxation measurements of the magnetic field penetration depth λ have been performed in a quasi two-dimensional (2-d) superconductor based on HfNCl intercalated with Li and organic molecules. The relaxation rate σ(T→0)∼0.5 μs −1 was obtained with transverse fields applied perpendicular to the aligned HfN planes. Using the relation σ∝λ −2 ∝n s2d /m ∗ (2-d superconducting carrier density/effective mass), we deduced the 2-d Fermi temperature TF2d. The ratio Tc/TF2d for the HfNCl-(Li) system is very close to those in two other quasi-2-d superconductors, YBa2Cu3O7 and (BEDT-TTF)2-X. Compared to the Kosterlitz–Thouless (KT) transition temperature TKT=TF2d/8 for the limit of strong coupling, Tc's of these systems are reduced by a factor of 3–4, indicating the importance of carrier overlapping and/or 3-d coupling. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect