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Low-temperature magnetic ordering in SrEr2O4

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Petrenko, O. A., Balakrishnan, Geetha, Wilson, Neil R., de Brion, S., Suard, E. and Chapon, L. C.. (2008) Low-temperature magnetic ordering in SrEr2O4. Physical Review B (Condensed Matter and Materials Physics), Volume 78 (Number 18). Article No. 184410 . ISSN 1098-0121

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Abstract

SrEr2O4 has been characterized by low-temperature powder neutron diffraction, as well as single-crystal specific-heat and magnetization measurements. Magnetization measurements show that the magnetic system is highly anisotropic at temperature above ordering. A magnetic field of 280 kOe applied at T=1.6 K does not overcome the anisotropic magnetization and fails to fully saturate the system. Long-range antiferromagnetic ordering develops below T-N=0.75 K, identified by magnetic Bragg reflections with propagation vector k=0 and a lambda anomaly in the specific heat. The magnetic structure consists of ferromagnetic chains running along the c axis, two adjacent chains being stacked antiferromagnetically. The moments point along the c direction, but only one of the two crystallographically inequivalent Er sites has a sizeable ordered magnetic moment, 4.5 mu(B) at 0.55 K. The magnetic properties of SrEr2O4 are discussed in terms of the interplay between the low dimensionality, competing exchange interactions, dipolar interactions, and low-lying crystal-field levels.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Strontium compounds -- Magnetic properties, Strontium compounds -- Thermal properties, Erbium, Oxides -- Thermal properties, Oxides -- Magnetic properties
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: November 2008
Volume: Volume 78
Number: Number 18
Number of Pages: 6
Page Range: Article No. 184410
Identification Number: 10.1103/PhysRevB.78.184410
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: European Commission (EC), Engineering and Physical Sciences Research Council (EPSRC)
Grant number: ITA-CT-2003-505474 (EC)
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URI: http://wrap.warwick.ac.uk/id/eprint/28898

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