Magnetic double-q ordering of tetragonal GdNi2B2C: A way to explain the magnetoelastic paradox

Jens Jensen and Martin Rotter
Phys. Rev. B 77, 134408 – Published 2 April 2008

Abstract

The orbital contribution to the magnetic moment of Gd3+ is zero, and the anisotropy is weak and dominated by the classical dipole interaction in most Gd systems. At the ordering wave vector q(0.55,0,0) in GdNi2B2C, the transverse b components are more strongly coupled than the a and c components, and the magnetic moments order in a linearly polarized sinusoidal wave just below TN. In this situation, the fourth-order term in the Landau expansion favors the double-q ordering, which ordering is found to explain the magnetic phase diagram and the “magnetoelastic paradox.”

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  • Received 20 December 2007

DOI:https://doi.org/10.1103/PhysRevB.77.134408

©2008 American Physical Society

Authors & Affiliations

Jens Jensen1 and Martin Rotter2

  • 1Niels Bohr Institute, Universitetsparken 5, 2100 Copenhagen, Denmark
  • 2Institut für Physikalische Chemie, Universität Wien, Währingerstrasse 42, 1010 Wien, Austria

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Issue

Vol. 77, Iss. 13 — 1 April 2008

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