Single crystal EPR study of trivalent gadolinium in Cs2NaInCl6 in the 6 - 300 K interval
J.L. Boldú, R.J. Gleason, and E. Muñoz P.
Instituto de Física, Universidad Nacional Autónoma de México Circuito de la Investigación Científica, Ciudad Universitaria México, D.F. 04510. MÉXICO, e-mail: boldu@fisica.unam.mx, gleason@fisica.unam.mx, emp@fisica.unam.mx.
Recibido el 15 de noviembre de 2004; ]]> aceptado el 24 de marzo de 2005
Abstract
A cubic symmetry site is reported for Gd3+ in Cs2NaInCl6 at room temperature. The temperature dependence of the cubic spin-Hamiltonian parameter has been measured in the temperature interval 6-300 K using electron paramagnetic resonance (EPR) spectrometry. A thorough EPR examination for a crystal sample clearly demonstrates that there are no new symmetry sites arising in the temperature interval under study (6-300 K) suggesting, therefore, that the site symmetry remains cubic. We fit an analytical expression for the cubic spin-Hamiltonian parameter 604 as a function of temperature. The absolute sign of this spin Hamiltonian parameter is also determined.
Keywords: Electron paramagnetic resonance (EPR); Elpasolite crystals; S-state ions; Gd3+.
Resumen
Se reporta un sitio de simetría cubica para Gd3+ en Cs2NaInCl6 a temperatura ambiente. Se mide la dependencia con la temperatura del parámetro cubico del Hamiltoniano de spin en el intervalo de 6 a 300 K por medio de resonancia paramagnética electrónica (RPE). Un examen detallado del cristal, por RPE, demuestra claramente que no hay sitios con nuevas simetrías en el intervalo de temperatura estudiado, sugiriendo, por lo tanto, que la simetría del sitio permanece cubica. Adaptamos una expresión analítica en función de la temperatura para el parámetro cúbico del Hamiltoniano de spin. Además se determina el signo absoluto de este parámetro.
Descriptores: Resonancia paramagnética electrónica; elpasolitas; iones estado S; Gd3+.
]]> PACS: 75.10.Dg; 75.30.-v; 76.30.Kg; 32.30.Dx
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Acknowledgments
We are grateful for the DGAPA grants (proyecto IN103500) for financial support. We also acknowledge with thanks the technical contribution of J. Barreto.
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