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Type: Artigo de periódico
Title: ESR study of the Eu2+ g-value in the metallic phase of cubic hexaboride Ca1-xEuxB6 (0.15 less than or similar to x <= 1.00)
Author: Urbano, RR
Pagliuso, PG
Rettori, C
Malachias, A
Granado, E
Schlottmann, P
Fisk, Z
Oseroff, SB
Abstract: The angular, magnetic field, and temperature dependence of the Eu2+(4f(7),S=7/2) g-value in Ca1-xEuxB6(0.15 less than or similar to x <= 1.00) is measured by means of electron spin resonance at two microwave frequencies, 9.4 and 34.4 GHz. The g-value is found to be anisotropic and magnetic-field-dependent. The reduction with field of the positive g-shift is interpreted in terms of the exchange interaction between the localized Eu(2+)4f(7) electrons with the conduction Eu2+ 5d-like electrons and B 2p-like holes. The angular, temperature, and x dependence of the anisotropy of the g-value can be attributed to demagnetization effects due to the platelet-like shape of the samples. High-resolution synchrotron x-ray diffraction experiments show the absence of distortions larger than delta a/a similar to 10(-4). However, a mechanism for the anisotropy based on a weak tetragonal lattice distortion arising from the crystal surface cannot be excluded.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 73, n. 11, 2006.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.73.115123
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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