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Title: Unusual diffusive effects on the ESR of Nd 3+ ions in the tunable topologically nontrivial semimetal YBiPt

Electron spin resonance (ESR) of diluted Nd 3+ ions in the topologically nontrivial semimetallic (TNSM) YBiPt compound is reported. The cubic YBiPt compound is a non-centrosymmetric half Heusler material which crystallizes in the F43m space group. The low temperature Nd 3+ ESR spectra showed a g-value of 2.66(4) corresponding to a $${{\Gamma}_{6}}$$ cubic crystal field Kramers' doublet ground state. Remarkably, the observed metallic and diffusive (Dysonian) Nd 3+ lineshape presented an unusual dependence with grain size, microwave power, Nd 3+ concentration and temperature. Furthermore, the spin dynamic of the localized Nd 3+ ions in YBiPt was found to be characteristic of a phonon-bottleneck regime. It is claimed that, in this regime for YBiPt, phonons are responsible for mediating the diffusion of the microwave energy absorbed at resonance by the Nd 3+ ions to the thermal bath throughout the skin depth ($$\delta \simeq 15$$ μm). We argue that this is only possible because of the existence of highly mobile conduction electrons inside the skin depth of YBiPt that are strongly coupled to the phonons by spin–orbit coupling. Thus, our unexpected ESR results point to a coexistence of metallic and insulating behaviors within the skin depth of YBiPt. This scenario is discussed in the light of the TNSM properties of this compound.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [1] ;  [1] ;  [6]
  1. Univ. of Campinas (UNICAMP) (Brazil). Inst. of Physics
  2. Univ. of Campinas (UNICAMP) (Brazil). Inst. of Physics; Univ. of California, Irvine, CA (United States)
  3. San Diego State Univ., CA (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Federal Univ. of ABC (UFABC), San Andrew (Brazil)
  5. Univ. of California, Irvine, CA (United States)
  6. Univ. of Campinas (UNICAMP) (Brazil). Inst. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Federal Univ. of ABC (UFABC), San Andrew (Brazil)
Publication Date:
Report Number(s):
LA-UR-17-27525
Journal ID: ISSN 0953-8984; TRN: US1800908
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 12; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1416300

Lesseux, G. G., Garitezi, T. M., Rosa, P. F. S., Jesus, C. B. R., Oseroff, S. B., Sarrao, J. L., Fisk, Z., Urbano, R. R., Pagliuso, P. G., and Rettori, C.. Unusual diffusive effects on the ESR of Nd 3+ ions in the tunable topologically nontrivial semimetal YBiPt. United States: N. p., Web. doi:10.1088/0953-8984/28/12/125601.
Lesseux, G. G., Garitezi, T. M., Rosa, P. F. S., Jesus, C. B. R., Oseroff, S. B., Sarrao, J. L., Fisk, Z., Urbano, R. R., Pagliuso, P. G., & Rettori, C.. Unusual diffusive effects on the ESR of Nd 3+ ions in the tunable topologically nontrivial semimetal YBiPt. United States. doi:10.1088/0953-8984/28/12/125601.
Lesseux, G. G., Garitezi, T. M., Rosa, P. F. S., Jesus, C. B. R., Oseroff, S. B., Sarrao, J. L., Fisk, Z., Urbano, R. R., Pagliuso, P. G., and Rettori, C.. 2016. "Unusual diffusive effects on the ESR of Nd 3+ ions in the tunable topologically nontrivial semimetal YBiPt". United States. doi:10.1088/0953-8984/28/12/125601. https://www.osti.gov/servlets/purl/1416300.
@article{osti_1416300,
title = {Unusual diffusive effects on the ESR of Nd 3+ ions in the tunable topologically nontrivial semimetal YBiPt},
author = {Lesseux, G. G. and Garitezi, T. M. and Rosa, P. F. S. and Jesus, C. B. R. and Oseroff, S. B. and Sarrao, J. L. and Fisk, Z. and Urbano, R. R. and Pagliuso, P. G. and Rettori, C.},
abstractNote = {Electron spin resonance (ESR) of diluted Nd3+ ions in the topologically nontrivial semimetallic (TNSM) YBiPt compound is reported. The cubic YBiPt compound is a non-centrosymmetric half Heusler material which crystallizes in the F43m space group. The low temperature Nd3+ ESR spectra showed a g-value of 2.66(4) corresponding to a ${{\Gamma}_{6}}$ cubic crystal field Kramers' doublet ground state. Remarkably, the observed metallic and diffusive (Dysonian) Nd3+ lineshape presented an unusual dependence with grain size, microwave power, Nd3+ concentration and temperature. Furthermore, the spin dynamic of the localized Nd3+ ions in YBiPt was found to be characteristic of a phonon-bottleneck regime. It is claimed that, in this regime for YBiPt, phonons are responsible for mediating the diffusion of the microwave energy absorbed at resonance by the Nd3+ ions to the thermal bath throughout the skin depth ($\delta \simeq 15$ μm). We argue that this is only possible because of the existence of highly mobile conduction electrons inside the skin depth of YBiPt that are strongly coupled to the phonons by spin–orbit coupling. Thus, our unexpected ESR results point to a coexistence of metallic and insulating behaviors within the skin depth of YBiPt. This scenario is discussed in the light of the TNSM properties of this compound.},
doi = {10.1088/0953-8984/28/12/125601},
journal = {Journal of Physics. Condensed Matter},
number = 12,
volume = 28,
place = {United States},
year = {2016},
month = {2}
}