μSR studies of magnetic superconductors based on the BETS molecule

FL Pratt, SJ Blundell, IM Marshall, T Lancaster, Stephen Leslie Lee, AJ Drew, U Divakar, H Matsui, N Toyota

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Muon spin rotation and relaxation measurements have been made on the molecular magnetic superconductors kappa-BETS2FeCl4 and kappa-BETS2FeBr4 and the non-magnetic molecular metals kappa-BETS2GaCl4 and lambda-BETS2GaCl4. In the magnetic materials, zero field muon spin relaxation signals show the formation of static antiferromagnetically ordered states and multiple precession frequencies are observed, corresponding to muon sites situated both within the anion layers and within the BETS layers. Studies of the relaxation behavior in the FeCl4 salt have previously shown significant changes around its superconducting transition and the FeBr4 salt reveals similar changes in the region of its superconducting transition, whose onset is around 1.5 K. In the non-magnetic GaCl4 salts the formation of a superconducting vortex lattice was observed and the penetration depth lambda was derived from the transverse field muon relaxation. When the BETS superconductors are compared with the ET-based superconductors that we have already studied using muSR, a striking correlation was observed between T-c and lambda(-3). (C) 2003 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2307-2310
Number of pages4
JournalPolyhedron
Volume22
Issue number14-17
DOIs
Publication statusPublished - 15 Jul 2003

Keywords

  • BETS
  • superconducting transition
  • muon
  • = BIS(ETHYLENEDITHIO)TETRASELENAFULVALENE
  • ORGANIC CONDUCTORS
  • KAPPA-(BETS)(2)FECL4
  • DENSITY
  • METAL

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