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Title: The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2

Abstract

The chiral helimagnet Cr1/3NbS2 hosts exotic spin textures, whose influence on the magneto-transport properties make this material an ideal candidate for future spintronic applications. To date, the interplay between macroscopic magnetic and transport degrees of freedom is believed to result from a reduction in carrier scattering following spin order. Here, we present electronic structure measurements across the helimagnetic transition temperature TC that challenges this view. We show that the Fermi surface is comprised of strongly hybridized Nb- and Cr-derived electronic states, and that spectral weight close to the Fermi level increases anomalously as the temperature is lowered below TC. These findings are rationalized on the basis of first principle density functional theory calculations, which reveal a large nearest-neighbor exchange energy, suggesting the interaction between local spin moments and hybridized Nb- and Cr-derived itinerant states to go beyond the perturbative interaction of Ruderman-Kittel-Kasuya-Yosida, suggesting instead a mechanism rooted in a Hund’s exchange interaction.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [3]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [3];  [3];  [2];  [2];  [7];  [8];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. IOM CNR Lab. TASC, Basovizza (Italy)
  4. IOM CNR Lab. TASC, Basovizza (Italy); Elettra-Sincrotrone Trieste S.C.p.A., Basovizza (Italy)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. IOM CNR Lab. TASC, Basovizza (Italy); International Centre for Theoretical Physics, Trieste (Italy)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1633567
Alternate Identifier(s):
OSTI ID: 1631651; OSTI ID: 1649063
Report Number(s):
LA-UR-20-22038
Journal ID: ISSN 2399-3650
Grant/Contract Number:  
89233218CNA000001; AC02-05CH11231; DMR-1151687; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Communications Physics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2399-3650
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material science; magnetism; electronic structure; photoemission

Citation Formats

Sirica, Nicholas Steven, Vilmercati, Paolo, Bondino, Federica, Pis, Igor, Nappini, Silvia, Mo, Sung -Kwan, Fedorov, Alexei V., Das, Pranab K., Vobornik, Ivana, Fujii, Jun, Li, Ling, Sapkota, Deepak, Parker, David S., Mandrus, David G., and Mannella, Norman. The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2. United States: N. p., 2020. Web. doi:10.1038/s42005-020-0333-3.
Sirica, Nicholas Steven, Vilmercati, Paolo, Bondino, Federica, Pis, Igor, Nappini, Silvia, Mo, Sung -Kwan, Fedorov, Alexei V., Das, Pranab K., Vobornik, Ivana, Fujii, Jun, Li, Ling, Sapkota, Deepak, Parker, David S., Mandrus, David G., & Mannella, Norman. The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2. United States. doi:https://doi.org/10.1038/s42005-020-0333-3
Sirica, Nicholas Steven, Vilmercati, Paolo, Bondino, Federica, Pis, Igor, Nappini, Silvia, Mo, Sung -Kwan, Fedorov, Alexei V., Das, Pranab K., Vobornik, Ivana, Fujii, Jun, Li, Ling, Sapkota, Deepak, Parker, David S., Mandrus, David G., and Mannella, Norman. Fri . "The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2". United States. doi:https://doi.org/10.1038/s42005-020-0333-3. https://www.osti.gov/servlets/purl/1633567.
@article{osti_1633567,
title = {The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2},
author = {Sirica, Nicholas Steven and Vilmercati, Paolo and Bondino, Federica and Pis, Igor and Nappini, Silvia and Mo, Sung -Kwan and Fedorov, Alexei V. and Das, Pranab K. and Vobornik, Ivana and Fujii, Jun and Li, Ling and Sapkota, Deepak and Parker, David S. and Mandrus, David G. and Mannella, Norman},
abstractNote = {The chiral helimagnet Cr1/3NbS2 hosts exotic spin textures, whose influence on the magneto-transport properties make this material an ideal candidate for future spintronic applications. To date, the interplay between macroscopic magnetic and transport degrees of freedom is believed to result from a reduction in carrier scattering following spin order. Here, we present electronic structure measurements across the helimagnetic transition temperature TC that challenges this view. We show that the Fermi surface is comprised of strongly hybridized Nb- and Cr-derived electronic states, and that spectral weight close to the Fermi level increases anomalously as the temperature is lowered below TC. These findings are rationalized on the basis of first principle density functional theory calculations, which reveal a large nearest-neighbor exchange energy, suggesting the interaction between local spin moments and hybridized Nb- and Cr-derived itinerant states to go beyond the perturbative interaction of Ruderman-Kittel-Kasuya-Yosida, suggesting instead a mechanism rooted in a Hund’s exchange interaction.},
doi = {10.1038/s42005-020-0333-3},
journal = {Communications Physics},
number = 1,
volume = 3,
place = {United States},
year = {2020},
month = {4}
}

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