Polar Metals Taxonomy for Materials Classification and Discovery

Hickox-Young, Daniel; Puggioni, Danilo; Rondinelli, James M.

doi:10.48550/arxiv.2210.05110

Cited by 1 publication

(1 citation statement)

References 116 publications

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“…Magnetic anisotropy is systematically determined by the CEF effect of R ions, and low-temperature transitions are dominated by the lowest CEF levels. Continuous structural evolution of the polarity and its potential interplay with nontrivial magnetism would be viewed as a promising platform for studying metallic multiferroics [62,63]. Findings in the present study provide basic understanding of single crystalline properties of a family of polar semimetal RAuGe.…”

Section: Resultsmentioning

confidence: 65%

Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd-Tm, and Lu)

Kurumaji¹,

Gen²,

Kitou³

et al. 2023

Preprint

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We study structural and magnetic properties of rare-earth based semimetals RAuGe (R = Y, Gd−Tm, and Lu) using flux-grown single crystals. These compounds belong to the noncentrosymmetric polar space group P 63mc. We confirm the systematic structural evolution at room temperature as a function of ionic radius of rare earths to clarify the isopointal crossover between two polar structures: three-dimensional LiGaGe-type and quasi-two-dimensional NdPtSb-type. Magnetism shows a characteristic anisotropy in reasonable agreement with the crystal electric field (CEF) theory; the easy-plane-type anisotropy for R = Tb and Dy turns into the Ising-type anisotropy for R = Er and Tm. We evaluate the CEF parameters based on the Stevens operators to reasonably reproduce the temperature dependence of magnetic susceptibilities and specific heat for RAuGe (R = Tb−Tm). The estimated energy scale of the Ising gap (∼ 11 meV) in TmAuGe is consistent with an excitation observed in an inelastic neutron scattering experiment. These findings suggest an opportunity for interplay between conduction electrons and nontrivial spin structures in the family of magnetic polar semimetals RAuGe.

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Section: Resultsmentioning

confidence: 65%