Electron spin resonance study of the local environment for the Gd3+ and Eu2+ ions in Ca1-xRxB6(R=Gd,Eu)(0.0001⩽x⩽0.30)
Abstract
The environment of Gd3 + / Eu2 + (4 f7, S = frac(7, 2)) in Ca1 - x Rx B6 (R = Gd, Eu ; 0.0001 ≤ x ≤ 0.30) is studied by electron spin resonance (ESR). For x ≲ 0.001 the spectra show Lorentzian shape (insulating phase). As x increases, the spectra present a superposition of Lorentzian and Dysonian resonances (coexistence of insulating and metallic phases). For x ≳ 0.01, the line shape becomes pure Dysonian (metallic phase). Thus, the intermediate concentration regime of Ca1 - x Rx B6 is intrinsically inhomogeneous. These compounds show no weak ferromagnetism. © 2006 Elsevier B.V. All rights reserved.
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