Journal Article

IMPULSE-2026-00133

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetoelastic effects in the metallic frustrated antiferromagnet CrB$_{2}$

Watanabe, T. (Corresponding author) ; Watanabe, M. ; Suganuma, S. ; Bauer, A.MLZ* ; Pfleiderer, C.MLZ*

2026
Inst. Woodbury, NY

Please use a persistent id in citations: doi:10.1103/b4zd-yhkl

Abstract: Hexagonal chromium diboride CrB2is a metallic frustrated antiferromagnet with a Néel temperature 𝑇𝑁∼88 K. In CrB2, Cr 3⁢𝑑electrons not only give rise to localized magnetic moments but also contribute to metallic conduction. We perform ultrasound velocity measurements on a single crystal of hexagonal CrB2to determine its elastic properties. The temperature dependence of the 𝑎⁢𝑏-plane shear elastic modulus exhibits Curie-type softening upon cooling from ∼120Kdown to 𝑇𝑁. This behavior is interpreted as a precursor to a symmetry-lowering lattice distortion at 𝑇𝑁, indicating that magnetic frustration is relieved via transverse magnetoelastic coupling. In addition, the 𝑎-axis and 𝑐-axis compressive elastic moduli show unusual softness and their suppression upon cooling, which are naturally explained by Fermi-surface nesting and its suppression upon cooling. The present results suggest that, in CrB2, longitudinal magnetoelastic coupling suppresses Fermi-surface nesting and enhances frustrated exchange interactions, while transverse magnetoelastic coupling plays a key role in relieving the frustration.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. Heinz Maier-Leibnitz Zentrum (MLZ)
2. E21 (E21)

Experiment(s):

1. No specific instrument

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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