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Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4

Eremin, M. V.
Published in Physical Review. B, Condensed Matter. 2016, vol. 93, no. 125138
Abstract Using high resolution x-ray diffraction (XRD) on high purity powders, we resolved the structure and ab symmetry of the intriguing compound Sr2VO4 from room temperature down to 20 K to an unprecedented level of accuracy. Upon cooling, this set of data unambiguously reveals a second-order phase transition lowering the symmetry from tetragonal to orthorhombic at a temperature Tc2=136 K. The observation of an orthorhombic distortion of the ab plane is attributed to nematic phase formation supported by local Jahn-Teller (JT) dynamical instability. At TN=105 K, spins order and at Tc1=100 K the tetragonal structure is recovered with an elongated c axis.
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Research groups Groupe Van der Marel
Groupe Cerny
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TEYSSIER, Jérémie et al. Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4. In: Physical Review. B, Condensed Matter, 2016, vol. 93, n° 125138. doi: 10.1103/PhysRevB.93.125138 https://archive-ouverte.unige.ch/unige:82339

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Deposited on : 2016-04-05

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