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Band Jahn-Teller Structural Phase Transition in Y2In



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


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.
Physical Review B


Neutron Diffraction, band Jahn-Teller Transition, profile refinement, hysteresis, First-order Structural Transition, Paramagnet, band structure calculations
Created February 23, 2018, Updated June 26, 2018