Spin reorientation and glassy dynamics in La1.55Sr0.45NiO4

S. R. Giblin, P. G. Freeman, K. Hradil, D. Prabhakaran, and A. T. Boothroyd
Phys. Rev. B 78, 184423 – Published 19 November 2008

Abstract

The magnetism of charge-stripe-ordered La1.55Sr0.45NiO4 was studied by a combination of neutron diffraction, muon-spin relaxation (μSR), and bulk susceptibility. Long-range magnetic ordering was observed at a lower temperature by μSR than by neutron diffraction, consistent with a glassy transition to the ordered phase. A second magnetic transition is detected by all techniques and is consistent with a spin reorientation. On cooling below TSR=42K the spins reorientate from lying 32.9±0.6° away from the stripe direction at 70 K to 56.8±0.4° at 10 K. The magnetic order was observed by neutron diffraction to have both three-dimensional and two-dimensional (without any correlation along the c axis) characters. μSR measurements confirmed this and are consistent with a single magnetically ordered spin-stripe phase. The effects of checkerboard charge order on the ordered phase and the characteristics of the phase diagram of the spin reorientation in charge-ordered La2xSrxNiO4 are commented on.

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  • Received 24 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.184423

©2008 American Physical Society

Authors & Affiliations

S. R. Giblin*

  • ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

P. G. Freeman

  • Institute Laue-Langevin, Boîte Postale 156, 38042 Grenoble Cedex 9, France

K. Hradil

  • Institut für Physikalische Chemie, Universität Göttingen, Tammanstrasse 6, 37077 Göttingen, Germany

D. Prabhakaran and A. T. Boothroyd

  • Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom

  • *sean.giblin@rl.ac.uk

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Issue

Vol. 78, Iss. 18 — 1 November 2008

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