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Magnetic Behaviour of the $Bi_2-y Sr_y Ir_2 O_7$ Pyrochlore Solid Solution

by: C. Cosio-Castaneda, de la Mora, F. Morales, R. Escudero, G. Tavizon
(12 Jan 2013)  Key: citeulike:11895408

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Abstract

The temperature dependence of magnetic susceptibility of the Bi$_2-y$Sr$_y$Ir$_2$O$_7$ system was studied from 2 to 300 K. According to these measurements, the solid solution $(0≤ y≤ 0.9)$ does not show any magnetic transition; however, a noticeable deviation from the Curie-Weiss law occurs and the magnetic behavior of this system can be ascribed to short-range magnetic order that is also present in several geometrically frustrated systems. The Pauli magnetic susceptibility decreases as the Sr content increases, this can be associated with a shift towards Ir$^5+$ in samples; also the Ir effective magnetic moment decreases. The estimated Wilson-ratio indicates the presence of strong electron-electron correlations.


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