Eur. Phys. J. B 46, 201-205 (2005)
https://doi.org/10.1140/epjb/e2005-00246-8

Electron spin resonance of Eu₂₊ in the Eu doped clathrate Ba₆Ge₂₅

¹ Max Planck Institute for the Chemical Physics of Solids, 01187 Dresden, Germany
² MRS Laboratory, Kazan State University, 420008 Kazan, Russia

Corresponding author: ^a sichelschmidt@cpfs.mpg.de

Received: 19 November 2004
Revised: 18 March 2005
Published online: 11 August 2005

Abstract

We report electron spin resonance (ESR) investigations of the clathrate compound Ba_6-xEu_xGe₂₅ (x=0.03–0.4) which exhibits a temperature induced, two-step reconstructive structure transformation at temperatures between 185 K and 223 K. The linewidth of the Eu²⁺ ESR proves to be sensitive to the transformation. Another anomaly in the temperature dependence of the linewidth is found near T=60 K which points towards another possible structural transition. Both anomalies seen in the ESR linewidth are not sensitive to the Eu content in contrast to the strong Eu-concentration dependence of transport properties.