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

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Zeitschrift für Physik B Condensed Matter

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) atT s =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 belowT N =316 K, and a hysteretic reorientation to a noncollinear spin structure occurs belowT s . The low energy spin dynamics of La1.65Nd0.35CuO4 aboveT s 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 belowT s .

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Author notes

  1. B. Keimer

    Present address: Department of Physcis, Princeton University, 08544, Princeton, NJ, USA

Authors and Affiliations

  1. Center for Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    B. Keimer, R. J. Birgeneau, A. Cassanho, M. Greven & M. A. Kastner

  2. Department of Physics, Tohoku University, Sendai 980, Japan

    Y. Endoh

  3. Brookhaven National Laboratory, 11973, Upton, NY, USA

    G. Shirane

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  1. B. Keimer
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  2. R. J. Birgeneau
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  3. A. Cassanho
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  4. Y. Endoh
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  5. M. Greven
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  6. M. A. Kastner
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  7. G. Shirane
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Keimer, B., Birgeneau, R.J., Cassanho, A. et al. Soft phonon behavior and magnetism at the low temperature structural phase transition of La1.65Nd0.35CuO4 . Z. Physik B - Condensed Matter 91, 373–382 (1993). https://doi.org/10.1007/BF01344067

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  • DOI: https://doi.org/10.1007/BF01344067

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