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Title: Revealing orbital and magnetic phase transitions in Pr0.5Ca0.5MnO3 epitaxial thin films by resonant soft x-ray scattering
Authors: Wadati, H.Geck, J.Schierle, E.Sutarto, R.He, F.-J.Hawthorn, D. G.Nakamura, M.Kawasaki, M.Tokura, Y.Sawatzky, G. A.
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Issue Date: 2014
Published in: New Journal of Physics, Volume 16
Publisher: Milton Park : Taylor & Francis
Abstract: Coherent epitaxial growth allows us to produce strained crystalline films with structures that are unstable in the bulk. Thereby, the overlayer lattice parameters in the interface plane, (a, b), determine theminimum-energy out-of-plane lattice parameter, cmin (a, b).We showbymeans of density-functional total energy calculations that this dependence can be discontinuous and predict related firstorder phase transitions in strained tetragonal films of the elements V, Nb, Ru, La, Os, and Ir. The abrupt change of cmin can be exploited to switch properties specific to the overlayer material. This is demonstrated for the example of the superconducting critical temperature of a vanadium film which we predict to jump by 20% at a discontinuity of cmin.
Keywords: Structural transitions; crystallography; superconducting films; nanoscale materials
DDC: 530
License: CC BY 3.0 Unported
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