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Commensurate-Incommensurate Magnetic Phase Transition in Magnetoelectric Single Crystal LiNiPO4

Published inPhysical review letters, vol. 92, no. 20, p. 207201/1-207201/4
Publication date2004
Abstract

Neutron scattering studies of single crystal LiNiPO4 reveal a spontaneous first-order commensurate-incommensurate magnetic phase transition. Short- and long-range incommensurate phases are intermediate between the high temperature paramagnetic and the low temperature antiferromagnetic phases. The modulated structure has a predominant antiferromagnetic component, giving rise to satellite peaks in the vicinity of the fundamental antiferromagnetic Bragg reflection, and a ferromagnetic component, giving rise to peaks at small momentum transfers around the origin at (0,±Q,0). The wavelength of the modulated magnetic structure varies continuously with temperature. It is argued that the incommensurate short- and long-range phases are due to spin-dimensionality crossover from a continuous to the discrete Ising state.

Keywords
  • Magnetic transition
  • Magnetoelectric effect (commensurate-incommensurate magnetic phase transition in magnetoelec. single crystal LiNiPO4)
  • Phase transition (commensurate-incommensurate commensurate-incommensurate magnetic phase transition in magnetoelec. single crystal LiNiPO4)
Citation (ISO format)
VAKNIN, David et al. Commensurate-Incommensurate Magnetic Phase Transition in Magnetoelectric Single Crystal LiNiPO4. In: Physical review letters, 2004, vol. 92, n° 20, p. 207201/1–207201/4. doi: 10.1103/PhysRevLett.92.207201
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ISSN of the journal0031-9007
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