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Title: Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Abstract

Cr1/3NbS2 is a unique example of a hexagonal chiral helimagnet with high crystalline anisotropy, and has generated growing interest for a possible magnetic field control of the incommensurate spin spiral. Here, we construct a comprehensive phase diagram based on detailed magnetization measurements of a high quality single crystal of Cr1/3NbS2 over three magnetic field regions. An analysis of the critical properties in the forced ferromagnetic region yields 3D Heisenberg exponents β = 0.3460 ± 0.040, γ = 1.344 ± 0.002, and TC = 130.78 K ± 0.044, which are consistent with the localized nature the of Cr3+ moments and suggest short-range ferromagnetic interactions. We exploit the temperature and magnetic field dependence of magnetic entropy change (ΔSM) to accurately map the nonlinear crossover to the chiral soliton lattice regime from the chiral helimagnetic phase. Our observations in the low field region are consistent with the existence of chiral ordering in a temperature range above the Curie temperature, TC < T < T*, where a first-order transition has been previously predicted. An analysis of the universal behavior of ΔSM(T,H) experimentally demonstrates for the first time the first-order nature of the onset of chiral ordering.

Authors:
 [1];  [1];  [2];  [2];  [1];  [2];  [2];  [1]
  1. Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Univ. of South Florida, Tampa, FL (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1423808
Grant/Contract Number:  
FG02-07ER46438; DMR-1410428
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetic properties and materials; phase transitions and critical phenomena

Citation Formats

Clements, Eleanor M., Das, Raja, Li, Ling, Lampen-Kelley, Paula J., Phan, Manh-Huong, Keppens, Veerle, Mandrus, David, and Srikanth, Hariharan. Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2. United States: N. p., 2017. Web. doi:10.1038/s41598-017-06728-5.
Clements, Eleanor M., Das, Raja, Li, Ling, Lampen-Kelley, Paula J., Phan, Manh-Huong, Keppens, Veerle, Mandrus, David, & Srikanth, Hariharan. Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2. United States. doi:10.1038/s41598-017-06728-5.
Clements, Eleanor M., Das, Raja, Li, Ling, Lampen-Kelley, Paula J., Phan, Manh-Huong, Keppens, Veerle, Mandrus, David, and Srikanth, Hariharan. Wed . "Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2". United States. doi:10.1038/s41598-017-06728-5. https://www.osti.gov/servlets/purl/1423808.
@article{osti_1423808,
title = {Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2},
author = {Clements, Eleanor M. and Das, Raja and Li, Ling and Lampen-Kelley, Paula J. and Phan, Manh-Huong and Keppens, Veerle and Mandrus, David and Srikanth, Hariharan},
abstractNote = {Cr1/3NbS2 is a unique example of a hexagonal chiral helimagnet with high crystalline anisotropy, and has generated growing interest for a possible magnetic field control of the incommensurate spin spiral. Here, we construct a comprehensive phase diagram based on detailed magnetization measurements of a high quality single crystal of Cr1/3NbS2 over three magnetic field regions. An analysis of the critical properties in the forced ferromagnetic region yields 3D Heisenberg exponents β = 0.3460 ± 0.040, γ = 1.344 ± 0.002, and TC = 130.78 K ± 0.044, which are consistent with the localized nature the of Cr3+ moments and suggest short-range ferromagnetic interactions. We exploit the temperature and magnetic field dependence of magnetic entropy change (ΔSM) to accurately map the nonlinear crossover to the chiral soliton lattice regime from the chiral helimagnetic phase. Our observations in the low field region are consistent with the existence of chiral ordering in a temperature range above the Curie temperature, TC < T < T*, where a first-order transition has been previously predicted. An analysis of the universal behavior of ΔSM(T,H) experimentally demonstrates for the first time the first-order nature of the onset of chiral ordering.},
doi = {10.1038/s41598-017-06728-5},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {7}
}

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