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Spin reorientation and glassy dynamics in La(1.55)Sr(0.45)NiO(4)

Authors :
Giblin, SR
Freeman, P
Hradil, K
Prabhakaran, D
Boothroyd, A
Source :
PHYSICAL REVIEW B. 78(18)
Publication Year :
2008

Abstract

The magnetism of charge-stripe-ordered La1.55Sr 0.45NiO4 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=42 K 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 La2-xSrxNiO4 are commented on. © 2008 The American Physical Society.

Details

Language :
English
ISSN :
1550235X and 10980121
Volume :
78
Issue :
18
Database :
OpenAIRE
Journal :
PHYSICAL REVIEW B
Accession number :
edsair.dedup.wf.001..c81595f94db8af51ef59551ca0976436