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Phys. Rev. Lett. 100, 056405 (2008) [4 pages]

Direct Observation of the High Magnetic Field Effect on the Jahn-Teller State in TbVO4

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C. Detlefs1, F. Duc2, Z. A. Kazeĭ3, J. Vanacken4, P. Frings2, W. Bras5, J. E. Lorenzo6, P. C. Canfield7, and G. L. J. A. Rikken2
1European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France
2Laboratoire National des Champs Magnétiques Pulsés, CNRS-INSA-UPS, Université de Toulouse, 143 Avenue de Rangueil, F-31400 Toulouse, France
3Moscow State University, Leninskye Gory, Moscow, 119992 Russia
4Pulsveldengroep, Institute for Nanoscale Physics and Chemistry, Clestijnenlaan 200D, B-3001 Leuven, Belgium
5Netherlands Organisation for Scientific Research (NWO), DUBBLE CRG at the ESRF, BP220, F-38043 Grenoble, France
6Institut Néel, CNRS, BP 166X, F-38043 Grenoble, France
7Ames Laboratory, USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 19 November 2007; published 8 February 2008

We report the first direct observation of the influence of high magnetic fields on the Jahn-Teller (JT) transition in TbVO4. Contrary to spectroscopic and magnetic methods, x-ray diffraction directly measures the JT distortion; the splitting between the (311)/(131) and (202)/(022) pairs of Bragg reflections is proportional to the order parameter. Our experimental results are compared to mean-field calculations, taking into account all possible orientations of the grains relative to the applied field, and qualitative agreement is obtained.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.056405
DOI:
10.1103/PhysRevLett.100.056405
PACS:
71.70.Ej, 75.10.−b, 75.25.+z
 
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