Structural Aspects of Metamagnetism in Ca2xSrxRuO4: Evidence for Field Tuning of Orbital Occupation

M. Kriener, P. Steffens, J. Baier, O. Schumann, T. Zabel, T. Lorenz, O. Friedt, R. Müller, A. Gukasov, P. G. Radaelli, P. Reutler, A. Revcolevschi, S. Nakatsuji, Y. Maeno, and M. Braden
Phys. Rev. Lett. 95, 267403 – Published 20 December 2005

Abstract

The crystal structure of Ca2xSrxRuO4 with 0.2x1.0 has been studied by diffraction techniques and by high resolution capacitance dilatometry as a function of temperature and magnetic field. Upon cooling in zero magnetic field, the crystal structure and the octahedra shrink along the c direction and elongate in the a and b planes, whereas the opposite occurs upon cooling at high field (x=0.2 and 0.5). These findings yield evidence for an orbital rearrangement driven by temperature and magnetic field, which accompanies the metamagnetic transition at low temperature. The temperature and magnetic-field dependencies are found to be governed by the same energy scale.

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  • Received 29 July 2004

DOI:https://doi.org/10.1103/PhysRevLett.95.267403

©2005 American Physical Society

Authors & Affiliations

M. Kriener1, P. Steffens1, J. Baier1, O. Schumann1, T. Zabel1, T. Lorenz1, O. Friedt1, R. Müller1, A. Gukasov2, P. G. Radaelli3, P. Reutler4,5, A. Revcolevschi5, S. Nakatsuji6, Y. Maeno6,7, and M. Braden1,*

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 2Laboratoire Léon Brillouin, CEA/CNRS, F-91191 Gif-sur-Yvette CEDEX, France
  • 3ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
  • 4II. Physikalisches Insitut, RWTH Aachen, Huykensweg, D-52056 Aachen, Germany
  • 5Laboratoire de Physico-Chimie de l’Etat Solide, Université Paris Sud, 91405 Orsay CEDEX, France
  • 6Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 7International Innovation Center and Department of Physics, Kyoto 606-8502, Japan

  • *Electronic address: braden@ph2.uni-koeln.de

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Issue

Vol. 95, Iss. 26 — 31 December 2005

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