Soft phonon behavior and magnetism at the low temperature structural phase transition of La1.65Nd0.35CuO4

B. Keimer, R. J. Birgeneau, A. Cassanho, Y. Endoh, M. Greven, M. A. Kastner, G. Shirane

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Abstract

We report a neutron scattering investigation of a La1.65Nd0.35CuO4 single crystal which undergoes a second order structural transition with decreasing temperature from a high temperature orthorhombic phase (space group Bmab) to a distinct low temperature orthorhombic phase (space group Pccn) at Ts=76 K. The transition is induced by the softening of the phonon mode that involves rotations of the tilt axis of the CuO6 octahedra. Antiferromagnetic long range order is established below TN=316 K, and a hysteretic reorientation to a noncollinear spin structure occurs below Ts. The low energy spin dynamics of La1.65Nd0.35CuO4 above Ts are closely similar to those of stoichiometric La2CuO4; at 100 K the gaps for in-plane and out-of-plane polarized spin waves are 2.3 meV and 5 meV, respectively. Out-of-plane polarized magnons are little affected by the structural transition, but the gap for in-plane polarized magnons increases markedly below Ts.

Original languageEnglish (US)
Pages (from-to)373-382
Number of pages10
JournalZeitschrift für Physik B Condensed Matter
Volume91
Issue number3
DOIs
StatePublished - Sep 1 1993

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