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Jahn-Teller induced nematic orbital order in tetragonal Sr 2 VO 4

DOI: 10.1103/PhysRevB.93.125138 DOI Help

Authors: Jeremie Teyssier (University of Geneva) , E. Giannini (University of Geneva) , Adrien Stucky (University of Geneva) , R. Černý (Department of Quantum Matter Physics, University of Geneva) , M. V. Eremin (Kazan (Volga region) Federal University) , D. Van Der Marel (Department of Quantum Matter Physics, University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 93

State: Published (Approved)
Published: March 2016
Diamond Proposal Number(s): 7637

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.

Subject Areas: Physics

Instruments: I11-High Resolution Powder Diffraction

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