Please use this identifier to cite or link to this item:
Type: Artigo
Title: Anharmonic rattling vibrations effects in the ESR of Er3+ doped SmB6 Kondo insulator
Author: Lesseux, G. G.
Rosa, P. F. S.
Fisk, Z.
Schlottmann, P.
Pagliuso, P. G.
Urbano, R. R.
Rettori, C.
Abstract: We report X-band Electron Spin Resonance (ESR) experiments on ≈0.2% and ≈0.7 % Er3+ doped SmB6 at low temperature (4 K - 40 K). The crystal field ground state of Er3+ in SmB6 is a Γ8 quartet with a nearby Γ6 excited doublet. The angular dependence of the resonances is not consistent with transitions between pure cubic crystal field states. The data were interpreted in terms of a dynamic Jahn-Teller (JT) effect by a coupling to Γ3 vibrational modes, which we propose to originate from the rattling of the small Er3+ ions in the large SmB6 cage. Our data show an anisotropic pair of E and E' resonances at g ≈4.4 and two nearly isotropic signals at g ≈5.8, one intense and narrow (A vibrational mode) and the other broad and faint, which we attribute to Er3+ ions at lattice sites which are strongly affected by strain, defects and/or extrinsic Al impurities that inhibits the JT effects. Our results are in general consistent with those previously reported by Sturm et al. In addition to the angular dependence of the lines, we discuss the intensities, g-values and the linewidths of the Er3+ transitions as a function of temperature.
Subject: Spin
Baixas temperaturas
Modos vibracionais
Country: Estados Unidos
Editor: AIP Publishing
Rights: aberto
Identifier DOI: 10.1063/1.4974914
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000402797100076.pdf2.67 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.