Neutron scattering study of magnetic ordering and excitations in the doped spin-gap system Tl(Cu1xMgx)Cl3

A. Oosawa, M. Fujisawa, K. Kakurai, and H. Tanaka
Phys. Rev. B 67, 184424 – Published 30 May 2003
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Abstract

Neutron elastic and inelastic scattering measurements have been performed in order to investigate the spin structure and the magnetic excitations in the impurity-induced antiferromagnetic ordered phase of the doped spin gap system Tl(Cu1xMgx)Cl3 with x=0.03. The magnetic Bragg reflections indicative of the ordering were observed at Q=(h,0,l) with integer h and odd l below TN=3.45K. It was found that the spin structure of the impurity-induced antiferromagnetic ordered phase on average in Tl(Cu1xMgx)Cl3 with x=0.03 is the same as that of the field-induced magnetic ordered phase for Hb in the parent compound TlCuCl3. The triplet magnetic excitation was clearly observed in the a*c* plane and the dispersion relations of the triplet excitation were determined along four different directions. The lowest triplet excitation corresponding to the spin gap was observed at Q=(h,0,l) with integer h and odd l, as observed in TlCuCl3. It was also found that the spin gap increases steeply below TN upon decreasing temperature. This strongly indicates that the impurity-induced antiferromagnetic ordering coexists with the spin gap state in Tl(Cu1xMgx)Cl3 with x=0.03.

  • Received 31 July 2002

DOI:https://doi.org/10.1103/PhysRevB.67.184424

©2003 American Physical Society

Authors & Affiliations

A. Oosawa1, M. Fujisawa2, K. Kakurai1, and H. Tanaka3

  • 1Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
  • 2Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • 3Research Center for Low Temperature Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan

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Vol. 67, Iss. 18 — 1 May 2003

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