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Spin glass transitions in the absence of chemical disorder for the pyrochlores A2Sb2O7 (A=Mn, Co, Ni)
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DOI：10.1016/j.jssc.2010.01.025.png)
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Abstract
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The pyrochlores in the series A(2)Sb(2)O(7) have been synthesized and characterized as exhibiting spin glass transitions at T-SG=41, 4.5, and 2.6 K (for A=Mn2+ S=5/2, Co2+ S=3/2 and Ni2+ S=1, respectively) despite the lack of chemical disorder. Since the Curie-Weiss temperature remains essentially constant for all members in the series (theta similar to -40K), the frustration index for these materials increases significantly as the moment size is reduced from f =vertical bar theta vertical bar/T-SG =1.1 (Mn2+), to 9.3 (Co2+) to 14.6 (Ni2+). There is also a corresponding change in the spin dynamics measured by the shift in the AC susceptibility signal as a function of frequency. These new materials provide an avenue to investigate the effect of quantum fluctuations on the Heisenberg pyrochlore lattice in the low spin limit, and show there is a dramatic change in the spin dynamics as the quantum regime is approached. (C) 2010 Published by Elsevier Inc.
Keywords:
Geometrically frustrated oxides
Magnetic properties
Pyrochlores
Spin glasses
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