Continuous magnetic and structural phase transitions in Fe1+yTe

I. A. Zaliznyak, Z. J. Xu, J. S. Wen, J. M. Tranquada, G. D. Gu, V. Solovyov, V. N. Glazkov, A. I. Zheludev, V. O. Garlea, and M. B. Stone
Phys. Rev. B 85, 085105 – Published 13 February 2012

Abstract

We report a sequence of continuous phase transformations in iron telluride, Fe1+yTe with y=0.10(1), which is observed by combining neutron diffraction, magnetic susceptibility, and specific-heat measurements on single-crystal samples. While a gradual increase of magnetic scattering near the wave vector (0.5,0,0.5) is seen below T70 K, a temperature where the discontinuous first-order magnetostructural phase transition is found in systems with small y (0.06), the reduction of the lattice symmetry in Fe1.1Te only occurs at Ts63 K. Below TN57.5 K, the long-range magnetic order develops, the incommensurate wave vector Qm of which varies with temperature. Finally, at Tm45 K, the system enters the low-T phase, where Qm is locked at (0.48,0,0.5). We conclude that these instabilities are weak compared to the strength of the underlying interactions, and we suggest that the impact of the Fe interstitials on the transitions can be treated with random-field models.

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  • Received 1 September 2011

DOI:https://doi.org/10.1103/PhysRevB.85.085105

©2012 American Physical Society

Authors & Affiliations

I. A. Zaliznyak1,*, Z. J. Xu1, J. S. Wen1,2, J. M. Tranquada1, G. D. Gu1, V. Solovyov1, V. N. Glazkov3,4, A. I. Zheludev4, V. O. Garlea5, and M. B. Stone5

  • 1CMPMSD, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Physics Department, University of California, Berkeley, California 94720, USA
  • 3P. Kapitza Institute for Physical Problems, Moscow, Russia
  • 4Neutron Scattering and Magnetism Group, Laboratorium für Festkörperphysik, ETH Hönggerberg, Zürich, Switzerland
  • 5Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA

  • *zaliznyak@bnl.gov

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Vol. 85, Iss. 8 — 15 February 2012

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