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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)|
|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.|
|Editor:||American Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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