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Evolution from insulator (x=0.003) to metal (x=1) of the Eu 2+ local environment in Ca 1-xEu xB 6

  • Author(s): Urbano, RR;
  • Pagliuso, PG;
  • Rettori, C;
  • Schlottmann, P;
  • Nakatsuji, S;
  • Fisk, Z;
  • Sarrao, JL;
  • Bianchi, A;
  • Oseroff, SB
  • et al.

Published Web Location

https://doi.org/10.1063/1.1855612Creative Commons 'BY' version 4.0 license
Abstract

The local environment of Eu2+ (4 f7, S=72) in Ca1-x Eux B6 (0.003≤x≤1.00) is studied by means of electron spin resonance (ESR). For x≲0.07 the resonances have Lorentzian line shape, indicating an insulating environment for the Eu2+ ions. For x≳0.07, the lines broaden and become Dysonian in shape, suggesting a change to metallic environment for the Eu2+ ions, anticipating the semimetallic character of EuB6. The broadening is attributed to a spin-flip scattering relaxation process due to the exchange interaction between conduction and Eu2+ 4f electrons. High field ESR measurements for x≳0.30 reveal narrower and anisotropic linewidths, which are attributed to magnetic polarons and Fermi surface effects, respectively. © 2005 American Institute of Physics.

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