Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe
Abstract
For this study, the B20-type cobalt germanide CoGe was investigated by measuring the specific heat, resistivity, and 59Co nuclear magnetic resonance (NMR). We observed a phase transition at TQ = 13.7 K, evidenced by a very narrow peak of the specific heat and sharp changes of the nuclear spin-spin (T2–1) and spin-lattice ( T1– 1) relaxation rates. The fact that the entropy release is extremely small and the Knight shift is almost independent of temperature down to low temperatures as anticipated in a paramagnetic metal indicates that the TQ transition is of nonmagnetic origin. In addition, we detected a crossover scale T0 ~ 30 K below which the resistivity and the NMR linewidth increase, and T1–1 is progressively distributed in space, that is, a static and dynamical spatial inhomogeneity develops. While the order parameter for the TQ transition remains an open question, a group-theoretical analysis suggests that the finite electric quadrupole density arising from the low local site symmetry at cobalt sites could drive the crystal symmetry lowering from the P213 symmetry that is commensurate to the R3 symmetry with an incommensurate wave vector, which fairly well accounts for the TQ transition. The quadrupole-order-driven commensurate-incommensurate phase transition may be anothermore »
- Authors:
-
[1];
[2];
[5];
[2]
- Changwon National University (Korea, Republic of)
- Russian Academy of Sciences (RAS), Moscow (Russian Federation). Vereshchagin Institute for High Pressure Physics
- Lomonosov Moscow State University (Russian Federation)
- Gdansk University of Technology (Poland)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 2318944
- Report Number(s):
- LA-UR-21-32121
Journal ID: ISSN 2469-9950
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 16; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; phase transitions; structural phase transition; helimagnets; noncentrosymmetric materials; transition metal alloys; group theory; nuclear magnetic resonance; resistivity measurements; specific heat measurements; x-ray diffraction
Citation Formats
Baek, S. -H., Sidorov, V. A., Nikolaev, A. V., Klimczuk, T., Ronning, Filip, and Tsvyashchenko, A. V. Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe. United States: N. p., 2022.
Web. doi:10.1103/physrevb.105.165132.
Baek, S. -H., Sidorov, V. A., Nikolaev, A. V., Klimczuk, T., Ronning, Filip, & Tsvyashchenko, A. V. Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe. United States. https://doi.org/10.1103/physrevb.105.165132
Baek, S. -H., Sidorov, V. A., Nikolaev, A. V., Klimczuk, T., Ronning, Filip, and Tsvyashchenko, A. V. Mon .
"Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe". United States. https://doi.org/10.1103/physrevb.105.165132. https://www.osti.gov/servlets/purl/2318944.
@article{osti_2318944,
title = {Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe},
author = {Baek, S. -H. and Sidorov, V. A. and Nikolaev, A. V. and Klimczuk, T. and Ronning, Filip and Tsvyashchenko, A. V.},
abstractNote = {For this study, the B20-type cobalt germanide CoGe was investigated by measuring the specific heat, resistivity, and 59Co nuclear magnetic resonance (NMR). We observed a phase transition at TQ = 13.7 K, evidenced by a very narrow peak of the specific heat and sharp changes of the nuclear spin-spin (T2–1) and spin-lattice ( T1– 1) relaxation rates. The fact that the entropy release is extremely small and the Knight shift is almost independent of temperature down to low temperatures as anticipated in a paramagnetic metal indicates that the TQ transition is of nonmagnetic origin. In addition, we detected a crossover scale T0 ~ 30 K below which the resistivity and the NMR linewidth increase, and T1–1 is progressively distributed in space, that is, a static and dynamical spatial inhomogeneity develops. While the order parameter for the TQ transition remains an open question, a group-theoretical analysis suggests that the finite electric quadrupole density arising from the low local site symmetry at cobalt sites could drive the crystal symmetry lowering from the P213 symmetry that is commensurate to the R3 symmetry with an incommensurate wave vector, which fairly well accounts for the TQ transition. The quadrupole-order-driven commensurate-incommensurate phase transition may be another remarkable phenomenon arising from the structural chirality inherent in the noncentrosymmetric B20 family.},
doi = {10.1103/physrevb.105.165132},
journal = {Physical Review. B},
number = 16,
volume = 105,
place = {United States},
year = {Mon Apr 18 00:00:00 EDT 2022},
month = {Mon Apr 18 00:00:00 EDT 2022}
}
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