Multiple Field-Induced Phase Transitions in the Geometrically Frustrated Dipolar Magnet: Gd2Ti2O7

Phys. Rev. Lett. 89, 067202 – Published 23 July 2002
A. P. Ramirez, B. S. Shastry, A. Hayashi, J. J. Krajewski, D. A. Huse, and R. J. Cava

Abstract

Field-driven phase transitions generally arise from competition between Zeeman energy and exchange or crystal-field anisotropy. Here we present the phase diagram of a frustrated pyrochlore magnet Gd2Ti2O7, where crystal-field splitting is small compared to the dipolar energy. We find good agreement between zero-temperature critical fields and those obtained from a mean-field model. Here, dipolar interactions couple real space and spin space, so the transitions in Gd2Ti2O7 arise from field-induced “cooperative anisotropy,” reflecting the broken spatial symmetries of the pyrochlore lattice.

DOI: http://dx.doi.org/10.1103/PhysRevLett.89.067202

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  • Received 6 August 2001
  • Published 23 July 2002

© 2002 The American Physical Society

Authors & Affiliations

A. P. Ramirez1,*, B. S. Shastry2,3,5, A. Hayashi4, J. J. Krajewski3, D. A. Huse5, and R. J. Cava4

  • 1Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545
  • 2Department of Physics, Indian Institute of Science, Bangalore 560012, India
  • 3Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974
  • 4Chemistry Department, Princeton University, Princeton, New Jersey 08540
  • 5Physics Department, Princeton University, Princeton, New Jersey 08540

  • *Experimental work performed at Bell Laboratories.

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