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Novel phase transition and metastable regions in the frustrated magnet CdCr2O4

S. Zherlitsyn, V. Tsurkan, A. A. Zvyagin, S. Yasin, S. Erfanifam, R. Beyer, M. Naumann, E. Green, J. Wosnitza, and A. Loidl
Phys. Rev. B 91, 060406(R) – Published 27 February 2015

Abstract

A new magnetic phase transition, which we assign to the separation of two different spiral phases, has been observed by ultrasound studies below the Néel temperature (TN=7.8 K) in the frustrated antiferromagnet CdCr2O4. This transition renormalizes the velocity and amplitude of the transverse acoustic mode cT whereas the longitudinal mode cL is not affected. The specific heat does not show any significant change in the entropy at this transition. Furthermore, in an applied magnetic field, the mode cT exhibits extended metastable magnetostructural states neighboring the one-half magnetization plateau in CdCr2O4. By applying an exchange-striction model we can quantitatively describe the field dependence of the sound velocity below and above the one-half magnetization plateau.

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  • Received 12 December 2014
  • Revised 10 February 2015

DOI:https://doi.org/10.1103/PhysRevB.91.060406

©2015 American Physical Society

Authors & Affiliations

S. Zherlitsyn1, V. Tsurkan2,3, A. A. Zvyagin4,5, S. Yasin1, S. Erfanifam1, R. Beyer1, M. Naumann1, E. Green1, J. Wosnitza1, and A. Loidl2

  • 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
  • 2Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics, Universität Augsburg, D-86159 Augsburg, Germany
  • 3Institute for Applied Physics, Academy of Science of Moldova, MD-2028 Chisinau, Republic of Moldova
  • 4Max Planck Institut für Physik komplexer Systeme, D-01187 Dresden, Germany
  • 5B.I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkov 61103, Ukraine

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Issue

Vol. 91, Iss. 6 — 1 February 2015

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