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Title

Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4

Authors
Eremin, M. V.
Published in Physical review. B, Condensed matter and materials physics. 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 Cerny
Groupe Van der Marel
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TEYSSIER, Jérémie et al. Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4. In: Physical review. B, Condensed matter and materials physics, 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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