Band Jahn-Teller Structural Phase Transition in Y2In

Published

February 23, 2018

Author(s)

E. Svanidze, C. Georgen, Qingzhen Huang, J. M. Santiago, Jeffrey W. Lynn, E. Morosan

Abstract

The number of paramagnetic materials that undergo a structural phase transition is rather small, which ca perhaps explain the limited understanding of the band Jahn-Teller mechanism responsible for the effect. Here we present a structural phase transition observed in paramagnetic Y₂In at temperature Τ₀=250 plus or minus} 1 K. Below Τ₀, the high-temperature hexagonal Ρ6₃/mmc phase transforms into the low-temperature orthorhombic Pnma phase. This transition is accompanied by an unambiguous thermal hysteresis of about 10 K, observed in both magnetic susceptibility M/H (T) and resistivity p(T), indicating a first order transition. Band structure calculations suggest a band Jahn-Teller mechanism, during which the degeneracy of electron bands close to the Fermi energy is broken. It was established that this structural phase transition does not have a magnetic component; however, a possibility of a charge density wave formation has not been eliminated.

Citation

Physical Review B

Volume

97

Issue

5

Pub Type

Journals

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Keywords

Neutron Diffraction, band Jahn-Teller Transition, profile refinement, hysteresis, First-order Structural Transition, Paramagnet, band structure calculations

Citation

Svanidze, E. , Georgen, C. , Huang, Q. , Santiago, J. , Lynn, J. and Morosan, E. (2018), Band Jahn-Teller Structural Phase Transition in Y₂In, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923588 (Accessed October 10, 2025)