Juxtaposition of Spin Freezing and Long Range Order in a Series of Geometrically Frustrated Antiferromagnetic Gadolinium Garnets

Specific heat measurements in zero magnetic field are presented on a homologous series of geometrically frustrated, antiferromagnetic, Heisenberg garnet systems. Measurements of Gd3Ga5O12, grown with isotopically pure Gd, agree well with previous results on samples with naturally abundant Gd, showin...

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Bibliographic Details
Published in:arXiv.org 2013-04
Main Authors: Quilliam, J A, Meng, S, Craig, H A, Corruccini, L R, Balakrishnan, G, Petrenko, O A, Gomez, A, Kycia, S W, Gingras, M J P, Kycia, J B
Format: Article
Language:English
Subjects:
Antiferromagnetism
Dilution
Freezing
Gadolinium
Gadolinium-gallium garnet
Garnets
Homology
Long range order
Low level
Structural analysis
X-ray diffraction
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Summary:Specific heat measurements in zero magnetic field are presented on a homologous series of geometrically frustrated, antiferromagnetic, Heisenberg garnet systems. Measurements of Gd3Ga5O12, grown with isotopically pure Gd, agree well with previous results on samples with naturally abundant Gd, showing no ordering features. In contrast, samples of Gd3Te2Li3O12 and Gd3Al5O12 are found to exhibit clear ordering transitions at 243 mK and 175 mK respectively. The effects of low level disorder are studied through dilution of Gd3+ with non-magnetic Y3+ in Gd3Te2Li3O12. A thorough structural characterization, using X-ray diffraction, is performed on all of the samples studied. We discuss possible explanations for such diverse behavior in very similar systems.
ISSN:2331-8422
DOI:10.48550/arxiv.1006.2969