Static Critical Behavior of the Spin-Freezing Transition in the Geometrically Frustrated Pyrochlore Antiferromagnet Y{sub 2}Mo{sub 2}O{sub 7}

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.947· OSTI ID:450450

Gingras, M ^[1]; Stager, C; Gaulin, B ^[2]; Raju, N; Greedan, J ^[3]

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1. TRIUMF, Theory Group, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T-2A3 (Canada)
2. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)
3. Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)

Some frustrated pyrochlore antiferromagnets, such as Y{sub 2}Mo{sub 2}O{sub 7}, show a spin-freezing transition and magnetic irreversibilities below a temperature T{sub f} similar to what is observed in {ital randomly} frustrated spin-glasses. We present results of nonlinear dc magnetization measurements on Y{sub 2}Mo{sub 2}O{sub 7} that provide strong evidence that there is an underlying thermodynamic phase transition at T{sub f}, which is characterized by critical exponents {gamma}{approx}2.8 and {beta}{approx}0.8. These values are typical of those found in random spin-glasses, despite the fact that the level of random disorder in Y{sub 2}Mo{sub 2}O{sub 7} is immeasurably small. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450450
• Journal Information: Physical Review Letters, Vol. 78, Issue 5; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM OXIDES
MAGNETIZATION
MOLYBDENUM OXIDES
PHASE TRANSFORMATIONS
ANTIFERROMAGNETISM
CRYSTAL DEFECTS
MAGNETIC SUSCEPTIBILITY
TEMPERATURE DEPENDENCE
PYROCHLORE