Muon spin relaxation measurements of magnetic-field penetration depth in Ba8Si46

Citation
Im. Gat et al., Muon spin relaxation measurements of magnetic-field penetration depth in Ba8Si46, PHYSICA B, 289, 2000, pp. 385-388
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
289
Year of publication
2000
Pages
385 - 388
Database
ISI
SICI code
0921-4526(200008)289:<385:MSRMOM>2.0.ZU;2-L
Abstract
Muon spin relaxation (mu SR) and high-field magnetization measurements have been performed in Ba8S46, a superconductor with T-c = 8 K having a silicon clathrate three-dimensional cage structure. The upper critical field H-c2 = 6.5 T, determined from the magnetization, indicates a short coherence len gth xi = 72 Angstrom. The magnetic field penetration depth lambda(T --> 0) = 4000 Angstrom was obtained from the muon spin relaxation rate sigma(T --> 0) similar to 0.46 mu s(-1) observed in transverse fields of 0.1-1 T. Thes e values of xi and lambda indicate that this system is a strongly type-II s uperconductor with a high value of kappa = 56, We deduce the effective Ferm i temperature T-F and compare the present system with other superconducting systems in a plot of T-c versus T-F. (C) 2000 Elsevier Science B.V. All ri ghts reserved.