Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3

Abstract The leading order nonlinear (NL) susceptibility, χ 3, in a paramagnet is negative and diverges as T → 0. This divergence is destroyed when spins correlate and the NL response provides unique insights into magnetic order. Dimensionality, exchange interaction, and preponderance of quantum eff...

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Autores principales:	Ludwig Holleis, Joseph C. Prestigiacomo, Zhijie Fan, Satoshi Nishimoto, Michael Osofsky, Gia-Wei Chern, Jeroen van den Brink, B. S. Shivaram
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/0a16e793172a4c1396b37282e542867b
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spelling	oai:doaj.org-article:0a16e793172a4c1396b37282e542867b2021-12-02T16:14:59ZAnomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl310.1038/s41535-021-00364-z2397-4648https://doaj.org/article/0a16e793172a4c1396b37282e542867b2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00364-zhttps://doaj.org/toc/2397-4648Abstract The leading order nonlinear (NL) susceptibility, χ 3, in a paramagnet is negative and diverges as T → 0. This divergence is destroyed when spins correlate and the NL response provides unique insights into magnetic order. Dimensionality, exchange interaction, and preponderance of quantum effects all imprint their signatures in the NL magnetic response. Here, we study the NL susceptibilities in the proximate Kitaev magnet α-RuCl3, which differs from the expected antiferromagnetic behavior. For T < T c = 7.5 K and field B in the ab-plane, we obtain contrasting NL responses in low (<2 T) and high field regions. For low fields, the NL behavior is dominated by a quadratic response (positive χ 2), which shows a rapid rise below T c. This large χ 2 > 0 implies a broken sublattice symmetry of magnetic order at low temperatures. Classical Monte Carlo (CMC) simulations in the standard K − H − Γ model secure such a quadratic B dependence of M, only for T ≈ T c with χ 2 being zero as T → 0. It is also zero for all temperatures in exact diagonalization calculations. On the other hand, we find an exclusive cubic term (χ 3) that describes the high field NL behavior well. χ 3 is large and positive both below and above T c crossing zero only for T > 50 K. In contrast, for B ∥ c-axis, no separate low/high field behaviors are measured and only a much smaller χ 3 is apparent.Ludwig HolleisJoseph C. PrestigiacomoZhijie FanSatoshi NishimotoMichael OsofskyGia-Wei ChernJeroen van den BrinkB. S. ShivaramNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Ludwig Holleis Joseph C. Prestigiacomo Zhijie Fan Satoshi Nishimoto Michael Osofsky Gia-Wei Chern Jeroen van den Brink B. S. Shivaram Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
description	Abstract The leading order nonlinear (NL) susceptibility, χ 3, in a paramagnet is negative and diverges as T → 0. This divergence is destroyed when spins correlate and the NL response provides unique insights into magnetic order. Dimensionality, exchange interaction, and preponderance of quantum effects all imprint their signatures in the NL magnetic response. Here, we study the NL susceptibilities in the proximate Kitaev magnet α-RuCl3, which differs from the expected antiferromagnetic behavior. For T < T c = 7.5 K and field B in the ab-plane, we obtain contrasting NL responses in low (<2 T) and high field regions. For low fields, the NL behavior is dominated by a quadratic response (positive χ 2), which shows a rapid rise below T c. This large χ 2 > 0 implies a broken sublattice symmetry of magnetic order at low temperatures. Classical Monte Carlo (CMC) simulations in the standard K − H − Γ model secure such a quadratic B dependence of M, only for T ≈ T c with χ 2 being zero as T → 0. It is also zero for all temperatures in exact diagonalization calculations. On the other hand, we find an exclusive cubic term (χ 3) that describes the high field NL behavior well. χ 3 is large and positive both below and above T c crossing zero only for T > 50 K. In contrast, for B ∥ c-axis, no separate low/high field behaviors are measured and only a much smaller χ 3 is apparent.
format	article
author	Ludwig Holleis Joseph C. Prestigiacomo Zhijie Fan Satoshi Nishimoto Michael Osofsky Gia-Wei Chern Jeroen van den Brink B. S. Shivaram
author_facet	Ludwig Holleis Joseph C. Prestigiacomo Zhijie Fan Satoshi Nishimoto Michael Osofsky Gia-Wei Chern Jeroen van den Brink B. S. Shivaram
author_sort	Ludwig Holleis
title	Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
title_short	Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
title_full	Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
title_fullStr	Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
title_full_unstemmed	Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3
title_sort	anomalous and anisotropic nonlinear susceptibility in the proximate kitaev magnet α-rucl3
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0a16e793172a4c1396b37282e542867b
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Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3

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