Static critical behavior of the spin-freezing transition in the geometrically frustrated pyrochlore antiferromagnet Y2Mo2O7

被引:224
作者
Gingras, MJP
Stager, CV
Raju, NP
Gaulin, BD
Greedan, JE
机构
[1] TRIUMF,THEORY GRP,VANCOUVER,BC V6T 2A3,CANADA
[2] MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON,ON L8S 4M1,CANADA
[3] MCMASTER UNIV,DEPT CHEM,HAMILTON,ON L8S 4M1,CANADA
关键词
D O I
10.1103/PhysRevLett.78.947
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Some frustrated pyrochlore antiferromagnets, such as Y2Mo2O7, show a spin-freezing transition and magnetic irreversibilities below a temperature T-f similar to what is observed in randomly frustrated spin-glasses. We present results of nonlinear de magnetization measurements on Y2Mo2O7 that provide strong evidence that there is an underlying thermodynamic phase transition at T-f, which is characterized by critical exponents gamma approximate to 2.8 and beta approximate to 0.8. These values are typical of those found in random spin-glasses, despite the fact that the level of random disorder in Y2Mo2O7 is immeasurably small.
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页码:947 / 950
页数:4
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