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Type: Artigo de periódico
Title: Noncubic symmetry in Ca1-xEuxB6 (0.15 less than or similar to x <= 1.00): An electron-spin-resonance study
Author: Urbano, RR
Pagliuso, PG
Rettori, C
Schlottmann, P
Fisk, Z
Oseroff, SB
Abstract: The Eu2+ (4f(7), S=7/2) g value in Ca1-xEuxB6 (0.15 less than or similar to x <= 1.00) was measured by means of electron spin resonance at two frequencies (fields), 9.4 (approximate to 3.4 kOe) and 34.4 GHz (approximate to 12.1 kOe). The g value was found to be anisotropic and magnetic-field dependent. The amplitude of the anisotropy increases at low temperatures. The observed angular and temperature dependences of the g value suggest tetragonal symmetry caused, presumably, by a distortion along a direction perpendicular to the largest crystal face, the [001] direction. Due to the platelet shape of the samples, part of the anisotropy of the g value can also be attributed to demagnetization effects. The g values decrease at higher fields, which is interpreted in terms of a two-band model involving an exchange interaction between the localized Eu2+ 4f(7) electrons with conduction Eu2+ 5d-like electrons and B 2p-like holes. (C) 2006 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 99, n. 8, 2006.
Rights: aberto
Identifier DOI: 10.1063/1.2164427
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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