Svanidze, E.Georgen, C.Hallas, A.M.Huang, Q.Santiago, J.M.Lynn, J.W.Morosan, E.2018-07-162018-07-162018Svanidze, E., Georgen, C., Hallas, A.M., et al.. "Band Jahn-Teller structural phase transition inﾠY2In." <i>Physical Review B,</i> 97, no. 5 (2018) American Physical Society: https://doi.org/10.1103/PhysRevB.97.054111.https://hdl.handle.net/1911/102427The number of paramagnetic materials that undergo a structural phase transition is rather small, which can perhaps explain the limited understanding of the band Jahn-Teller mechanism responsible for this effect. Here we present a structural phase transition observed in paramagnetic Y2In at temperature T0=250±5 K. Below T0, the high-temperature hexagonal P63/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 ρ(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. We establish that this structural phase transition does not have a magnetic component; however, the possibility of a charge density wave formation has not been eliminated.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttps://doi.org/10.1103/PhysRevB.97.054111