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- W2061493638 abstract "Elastic-constant measurements, made with use of a high-precision ultrasonic interferometer, have allowed determination of the susceptibility critical exponent ensuremath{gamma} in the random-field Ising system Dy(${mathrm{As}}_{mathit{x}}$${mathrm{V}}_{1mathrm{ensuremath{-}}mathit{x}}$)${mathrm{O}}_{4}$. For pure ${mathrm{DyVO}}_{4}$, a value ensuremath{gamma}=1.15ifmmodepmelsetextpmfi{}0.05 was obtained, which is between the values ensuremath{gamma}=1 for a mean-field system and ensuremath{gamma}=1.25 for a three-dimensional Ising system with nearest-neighbor interactions, and consistent with conclusions reached by previous authors that there is a strong short-range component to the exchange interactions. Random-field samples yielded a significantly higher value, specifically ensuremath{gamma}=1.79ifmmodepmelsetextpmfi{}0.07, consistent with the two-dimensional nearest-neighbor Ising value ensuremath{gamma}=7/4 and with results of simulations by other authors, but in disagreement with certain scaling-theory predictions. This is the most reliable value obtained thus far for ensuremath{gamma} in a random-field Ising system in three dimensions. Results of optical-birefringence measurements on the ultrasonics samples, along with numerical simulations, show that the measurement of ensuremath{gamma} was not significantly affected by arsenic-concentration inhomogeneities." @default.
- W2061493638 created "2016-06-24" @default.
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- W2061493638 date "1991-09-01" @default.
- W2061493638 modified "2023-10-17" @default.
- W2061493638 title "Ultrasonic investigation of critical behavior in the random-field Ising system Dy(AsxV1−x)O4" @default.
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- W2061493638 doi "https://doi.org/10.1103/physrevb.44.4127" @default.
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