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Title: Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe

Abstract

We present details of materials synthesis, crystal structure, and anisotropic magnetic properties of single crystals of CeAlGe, a proposed type-II Weyl semimetal. Single-crystal x-ray diffraction confirms that CeAlGe forms in a noncentrosymmetric I41md space group, in line with predictions of nontrivial topology. Magnetization, specific heat, and electrical transport measurements were used to confirm antiferromagnetic order below 5 K, with an estimated magnon excitation gap of Δ = 9.11 K from heat capacity and hole-like carrier density of 1.4 × 1020 cm–3 from Hall effect measurements. The easy magnetic axis is along the [100] crystallographic direction, indicating that the moment lies in the tetragonal ab plane below 7 K. A spin-flop transition to less than 1 μB/Ce is observed to occur below 30 kOe at 1.8 K in the M(H) (H ∥ a) data. Furthermore, small magnetic fields of 3 and 30 kOe are sufficient to suppress magnetic order when applied along the a and c axes, respectively, resulting in a complex T–H phase diagram for H ∥ a and a simpler one for H ∥ c.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1613136
Alternate Identifier(s):
OSTI ID: 1488634
Grant/Contract Number:  
SC0019154
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 24; 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; Physics; Antiferromagnetism; Metamagnetism; Topological materials; Weyl semimetal; AC susceptibility measurements; Magnetization measurements; Specific heat measurements; X-ray diffraction

Citation Formats

Hodovanets, H., Eckberg, C. J., Zavalij, P. Y., Kim, H., Lin, W. -C., Zic, M., Campbell, D. J., Lin, W. -C., and Paglione, J. Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.245132.
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Hodovanets, H., Eckberg, C. J., Zavalij, P. Y., Kim, H., Lin, W. -C., Zic, M., Campbell, D. J., Lin, W. -C., & Paglione, J. Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe. United States. https://doi.org/10.1103/physrevb.98.245132
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Hodovanets, H., Eckberg, C. J., Zavalij, P. Y., Kim, H., Lin, W. -C., Zic, M., Campbell, D. J., Lin, W. -C., and Paglione, J. Thu . "Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe". United States. https://doi.org/10.1103/physrevb.98.245132. https://www.osti.gov/servlets/purl/1613136.
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@article{osti_1613136,
title = {Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe},
author = {Hodovanets, H. and Eckberg, C. J. and Zavalij, P. Y. and Kim, H. and Lin, W. -C. and Zic, M. and Campbell, D. J. and Lin, W. -C. and Paglione, J.},
abstractNote = {We present details of materials synthesis, crystal structure, and anisotropic magnetic properties of single crystals of CeAlGe, a proposed type-II Weyl semimetal. Single-crystal x-ray diffraction confirms that CeAlGe forms in a noncentrosymmetric I41md space group, in line with predictions of nontrivial topology. Magnetization, specific heat, and electrical transport measurements were used to confirm antiferromagnetic order below 5 K, with an estimated magnon excitation gap of Δ = 9.11 K from heat capacity and hole-like carrier density of 1.4 × 1020 cm–3 from Hall effect measurements. The easy magnetic axis is along the [100] crystallographic direction, indicating that the moment lies in the tetragonal ab plane below 7 K. A spin-flop transition to less than 1 μB/Ce is observed to occur below 30 kOe at 1.8 K in the M(H) (H ∥ a) data. Furthermore, small magnetic fields of 3 and 30 kOe are sufficient to suppress magnetic order when applied along the a and c axes, respectively, resulting in a complex T–H phase diagram for H ∥ a and a simpler one for H ∥ c.},
doi = {10.1103/physrevb.98.245132},
journal = {Physical Review. B},
number = 24,
volume = 98,
place = {United States},
year = {Thu Dec 20 00:00:00 EST 2018},
month = {Thu Dec 20 00:00:00 EST 2018}
}
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https://doi.org/10.1103/physrevb.98.245132
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    Works referencing / citing this record:

    Seeing is believing: visualization of antiferromagnetic domains
    journal, January 2020

    Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields
    journal, January 2020

    Large anomalous Hall effect in ferromagnetic Weyl semimetal candidate PrAlGe
    journal, May 2019

    • Meng, Biao; Wu, Hao; Qiu, Yang
    • APL Materials, Vol. 7, Issue 5
    • DOI: 10.1063/1.5090795

    Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe 1− x Si x
    journal, January 2020

    • Yang, Hung-Yu; Singh, Bahadur; Lu, Baozhu
    • APL Materials, Vol. 8, Issue 1
    • DOI: 10.1063/1.5132958

    Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe
    journal, January 2020

    Singular angular magnetoresistance in a magnetic nodal semimetal
    journal, June 2019

    Seeing is believing: visualization of antiferromagnetic domains
    text, January 2020

    Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields
    text, January 2020

    • Destraz, Daniel; Das, Lakshmi; Tsirkin, Stepan S.
    • Nature Publishing Group
    • DOI: 10.5167/uzh-182396

    Noncollinear ferromagnetic Weyl semimetal with anisotropic anomalous Hall effect
    journal, March 2021

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