Agradecimentos: This work was supported by FAPESP-SP-Brazil and CNPq-Brazil.

Abstract: We report temperature dependent magnetic susceptibility and electron spin resonance (ESR) measurements on single crystals of the frustrated antiferromagnet Gd1-xYxInCu4 (x = 0, 0.01, 0.05 and 0.1). The magnetic susceptibility data revealed, as expected, a decreasing in the...

Abstract: We report temperature dependent magnetic susceptibility and electron spin resonance (ESR) measurements on single crystals of the frustrated antiferromagnet Gd1-xYxInCu4 (x = 0, 0.01, 0.05 and 0.1). The magnetic susceptibility data revealed, as expected, a decreasing in the antiferromagnetic ordering temperature as function of the Y-concentration, while the high-T Curie-Weiss temperatures remain nearly unaffect by the doping. For T greater than or similar to 100 K, a single Dysonian Gd3+ ESR line with a nearly temperature independent g similar to 1.989(8) is observed, and its linewidth follows a Korringa-like (Delta H/Delta T similar to 0.75(5) Oe/K) behavior as a function of temperature. Below T approximate to 100 K both the ESR g-value and linewidth are affected by the presence of strong short-range magnetic correlation in the paramagnetic phase well above T-N, consistently with the frustrated character of this compound. The role of chemical disorder and dilution effects induced by Y-doping in the properties of this highly frustrated material is discussed

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

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