Conduction electron spin resonance in AlB2

Autor(es):Mostrar menos -

Holanda, L. M. ^[1] ; Mendonca-Ferreira, L. ^[2] ; Ribeiro, R. A. ^[2] ; Osorio-Guillen, J. M. ^{[2, 3]} ; Dalpian, G. M. ^[2] ; Kuga, K. ^[4] ; Nakatsuji, S. ^[4] ; Fisk, Z. ^[5] ; Urbano, R. R. ^[1] ; Pagliuso, P. G. ^{[1, 5]} ; Rettori, C. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

^[3] Univ Antioquia, Inst Fis, Medellin - Colombia

^[4] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581 - Japan

^[5] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 25, n. 21 MAY 29 2013.
• Citações Web of Science: 4

Resumo

This work reports on electron spin resonance experiments in oriented single crystals of the hexagonal AlB2 diboride compound (P6/mmm, D16h structure) which display conduction electron spin resonance. The X-band electron spin resonance spectra showed a metallic Dysonian resonance with g-value and intensity independent of temperature. The thermal broadening of the anisotropic electron spin resonance linewidth Delta H tracks the T-dependence of the electrical resistivity below T similar or equal to 100 K. These results confirm the observation of a conduction electron spin resonance in AlB2 and are discussed in comparison with other boride compounds. Based on our main findings for AlB2 and the calculated electronic structure of similar layered honeycomb-like structures, we conclude that any array of covalent B-B layers potentially results in a conduction electron spin resonance signal. This observation may shed new light on the nature of the non-trivial conduction electron spin resonance-like signals of complex f-electron systems such as beta-YbAlB4. (AU)

• Processo FAPESP: 06/60440-0 - Estudo de sistemas fortemente correlacionados em condições extremas
• Beneficiário: Carlos Rettori
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 11/01564-0 - Síntese e caracterização de novos materiais complexos e avançados
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Linha de fomento: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 12/05903-6 - Ressonância magnética nuclear de novos materiais complexos e avançados em física da matéria condensada
• Beneficiário: Ricardo Rodrigues Urbano
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores