High frequency (208 GHz) determination of the cubic spin Zeeman term for the U3+ ion in the dilute magnetic semiconductor crystals of Pb1-xUxTe and Pb1-xUxSe at 5 K by electron paramagnetic resonance

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:378

Article

Misra, Sushil K.¹  Michaels, Adam¹ 

[1] Concordia Univ, Dept Phys, Montreal, PQ H3G 1M8, Canada

关键词: High-frequency EPR;    Spin-Hamiltonian parameters;    Pb1-xUxTe and Pb1-xUxSe single crystals;    U3+ ion;    Zeeman cubic spin parameter;    Dilute magnetic semiconductor;   

DOI  :  10.1016/j.jmmm.2014.11.024

来源: Elsevier

【 摘 要 】

A high-frequency (208 GHz) Electron Paramagnetic Resonance (EPR) study on the U3+ ion (5r(3), I-4(9/2), S=3/2) embedded with 3% concentration in the dilute magnetic semiconductor crystals of PbTe and PbSe, each characterized by cubic symmetry, has been performed at similar to 5 K, especially in view to determine the value of the Zeeman cubic spin term parameter u, and the site symmetry of the U3+ ion (radius 0.089 nm), substituting for the Pb2+ ion (radius 0.119 nm). The experimental spectra reveal the presence of only one set of EPR lines from U3+ ions in these host crystals, exhibiting cubic symmetry, whose magnetic axes are oriented along the crystal axes. The spin-Hamiltonian parameters are for both crystals: g = 1.9811, u = -0.0257. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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