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Type: | Artigo |
Title: | Electron spin resonance of Gd3+ in three dimensional topological insulator Bi2se3 |
Author: | Garitezi, T. M. Lesseux, G. G. Jesus, C. B. R. Grant, T. Fisk, Z. Urbano, R. R. Rettori, C. Pagliuso, P. G. |
Abstract: | Bi2Se3 has been claimed to be a three dimensional topological insulator (TI) with topologically protected metallic surface states with exotic properties. We have performed electron spin resonance (ESR) measurements on Gd3+ doped (x approximate to 0.01) Bi2Se3 single crystal grown from stoichiometric melt. For the studied crystals, our preliminary results revealed a partly resolved Gd3+ fine structure spectrum with Dysonian (metallic character) lines. At room temperature, the central line has a g approximate to 1.98, a linewidth Delta H approximate to 95 G and the spectra have a overall splitting of roughly 1300 Oe. As the temperature is decreased, the Gd3+ ESR Delta H of the central line presents a very small Korringa-like behavior b = Delta H/Delta T approximate to 0.013 Oe/K and nearly T-independent g-value. However, for T less than or similar to 40 K, Delta H shows a stronger narrowing effect evolving to Korringa-like behavior (b approximate to 0.15 Oe/K) for T less than or similar to 30 K. Concomitantly with the change in Delta H behavior, the Gd3+ central line g value starts to decrease reaching a value of 1.976 at T less than or similar to 4.2 K. The ESR results are discussed in terms of possible effects of protected topological surface states enlightened by complementary data from macroscopic measurements |
Subject: | Compostos intermetálicos Íons |
Country: | Reino Unido |
Editor: | IOP Publishing |
Rights: | Aberto |
Identifier DOI: | 10.1088/1742-6596/592/1/012126 |
Address: | https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012125 |
Date Issue: | 2015 |
Appears in Collections: | IFGW - Artigos e Outros Documentos |
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