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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Multiband electronic characterization of the complex intermetallic cage system Y1-xGdxCo2Zn20

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Autor(es):
Cabrera-Baez, M. [1] ; Naranjo-Uribe, A. [2] ; Osorio-Guillen, J. M. [2] ; Rettori, C. [3, 1] ; Avila, M. A. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed ABC, CCNH, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Antioquia UdeA, Inst Fis, Medellin - Colombia
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 92, n. 21 DEC 10 2015.
Citações Web of Science: 5
Resumo

A detailed microscopic and quantitative description of the electronic and magnetic properties of Gd3+-doped YCo2Zn20 single crystals (Y1-xGdxCo2Zn20, 0.002 less than or similar to x <= 1.00) is reported through a combination of temperature-dependent electron spin resonance (ESR), heat capacity, and dc magnetic susceptibility experiments, plus first-principles density functional theory (DFT) calculations. The ESR results indicate that this system features an exchange bottleneck scenario wherein various channels for the spin-lattice relaxation mechanism of the Gd3+ ions can be identified via exchange interactions with different types of conduction electrons at the Fermi level. Quantitative support from the other techniques allows us to extract the exchange interaction parameters between the localized magnetic moments of the Gd3+ ions and the different types of conduction electrons present at the Fermi level (J(fs), J(fp), and J(fd)). Despite the complexity of the crystal structure, our combination of experimental and electronic structure data establish GdCo2Zn20 as a model RKKY system by predicting a Curie-Weiss temperature theta(C) = -1.2(2) K directly from microscopic parameters, in very good agreement with the bulk value from magnetization data. The successful microscopic understanding of the electronic structure and behavior for the two end compounds YCo2Zn20 and GdCo2Zn20 means they can be used as references to help describe the more complex electronic properties of related materials. (AU)

Processo FAPESP: 12/17562-9 - Preparação de monocristais orientados para estudos de anisotropias eletrônicas, magnéticas e térmicas
Beneficiário:Marcos de Abreu Avila
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 11/19924-2 - Estudo e desenvolvimento de novos materiais avançados: eletrônicos, magnéticos e nanoestruturados: uma abordagem interdisciplinar
Beneficiário:Carlos Rettori
Linha de fomento: Auxílio à Pesquisa - Temático