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Title: Nematic State in CeAuSb 2

Abstract

At ambient pressure and zero field, tetragonal CeAuSb2 hosts stripe antiferromagnetic order at TN= 6.3 K. Here, we first show via bulk thermodynamic probes and x-ray diffraction measurements that this magnetic order is connected with a structural phase transition to a superstructure that likely breaks C4 symmetry, thus signaling nematic order. The temperature-field-pressure phase diagram of CeAuSb2 subsequently reveals the emergence of additional ordered states under applied pressure at a multicritical point. Our phenomenological model supports the presence of a vestigial nematic phase in CeAuSb2 akin to iron-based high-temperature superconductors; however, superconductivity, if present, remains to be discovered.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ; ; ; ; ; ; ORCiD logo; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1599487
Alternate Identifier(s):
OSTI ID: 1630855; OSTI ID: 1656854
Report Number(s):
LA-UR-19-27666
Journal ID: ISSN 2160-3308; PRXHAE; 011035
Grant/Contract Number:  
SC0012336; 89233218CNA000001; SC0020045
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science; Magnetic phase transitions; Magnetism; Nematic order; Phase diagrams; Pressure effects; Thermal expansion; Strongly correlated systems; Landau-Ginzburg theory; Resistivity measurements; Specific heat measurements; Thermodilatometry; X-ray diffraction

Citation Formats

Seo, S., Wang, Xiaoyu, Thomas, S. M., Rahn, M. C., Carmo, D., Ronning, F., Bauer, E. D., dos Reis, R. D., Janoschek, M., Thompson, J. D., Fernandes, R. M., and Rosa, P. F. S. Nematic State in CeAuSb 2. United States: N. p., 2020. Web. doi:10.1103/PhysRevX.10.011035.
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Seo, S., Wang, Xiaoyu, Thomas, S. M., Rahn, M. C., Carmo, D., Ronning, F., Bauer, E. D., dos Reis, R. D., Janoschek, M., Thompson, J. D., Fernandes, R. M., & Rosa, P. F. S. Nematic State in CeAuSb 2. United States. https://doi.org/10.1103/PhysRevX.10.011035
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Seo, S., Wang, Xiaoyu, Thomas, S. M., Rahn, M. C., Carmo, D., Ronning, F., Bauer, E. D., dos Reis, R. D., Janoschek, M., Thompson, J. D., Fernandes, R. M., and Rosa, P. F. S. Thu . "Nematic State in CeAuSb 2". United States. https://doi.org/10.1103/PhysRevX.10.011035.
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@article{osti_1599487,
title = {Nematic State in CeAuSb 2},
author = {Seo, S. and Wang, Xiaoyu and Thomas, S. M. and Rahn, M. C. and Carmo, D. and Ronning, F. and Bauer, E. D. and dos Reis, R. D. and Janoschek, M. and Thompson, J. D. and Fernandes, R. M. and Rosa, P. F. S.},
abstractNote = {At ambient pressure and zero field, tetragonal CeAuSb2 hosts stripe antiferromagnetic order at TN= 6.3 K. Here, we first show via bulk thermodynamic probes and x-ray diffraction measurements that this magnetic order is connected with a structural phase transition to a superstructure that likely breaks C4 symmetry, thus signaling nematic order. The temperature-field-pressure phase diagram of CeAuSb2 subsequently reveals the emergence of additional ordered states under applied pressure at a multicritical point. Our phenomenological model supports the presence of a vestigial nematic phase in CeAuSb2 akin to iron-based high-temperature superconductors; however, superconductivity, if present, remains to be discovered.},
doi = {10.1103/PhysRevX.10.011035},
journal = {Physical Review. X},
number = 1,
volume = 10,
place = {United States},
year = {2020},
month = {2}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevX.10.011035
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Specific heat divided by temperature of CeAuSb2 at ambient pressure. The inset is a magnified view near the peak position. Arrows indicate the transition temperatures Tnem and TN . (b) Calculated C/T versus reduced temperature for fixed anisotropy ζ and various inverse nematic coupling strength $\barα$. Themore » inset gives the derivative of C/T of the experimental data (purple) and of the calculations with $\barα$ = 2.7 (green). The theoretical curve was shifted and averaged over disorder for better comparison with the experimental data; details are given in the Supplemental Material. (c) Temperature-dependent magnetic susceptibility in an applied field of 1 kOe along the c axis. ZFC (zero-field cooled; open circles) and FC (field-cooled; solid circles) curves show two transitions without hysteresis. The inset plots the derivative dχ/dT. (d) Temperature dependence of the thermal expansion ΔL/ L of CeAuSb2 along [00] at zero field, 1 T, and 2 T applied along the c axis. The inset gives the thermal expansion coefficient.« less
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