Large Random-Field Behavior above the Vacancy Percolation Concentration Threshold: Fe0.84Zn0.16F2

Takuo Sakon; Satoshi Awaji; Mitsuhiro Motokawa; David P. Belanger

doi:10.1143/JPSJ.71.411

Large Random-Field Behavior above the Vacancy Percolation Concentration Threshold: Fe_0.84Zn_0.16F₂

Takuo Sakon, Satoshi Awaji, Mitsuhiro Motokawa, David P. Belanger

IMR - High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

High-field magnetization measurements, with H ≤ 20T, yield the random-field Ising model (RFIM) specific heat behavior near the H-T phase boundary in Fe_0.84Zn_0.16F₂. This sample, with x greater than the magnetic vacancy percolation threshold, X_v = 0.754, is in the concentration range that shows equilibrium neutron scattering line shapes at low temperature and |q| > 0, unlike samples for which x < X_v. The temperature derivative of the uniform magnetization shows the expected low-field random-field Ising scaling behavior for H ≤ 18 T. At H = 20 T, however, the peak temperature and amplitude are significantly suppressed, indicating a high-field RFIM region of the H-T phase diagram.

Original language	English
Pages (from-to)	411-413
Number of pages	3
Journal	Journal of the Physical Society of Japan
Volume	71
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.71.411
Publication status	Published - 2002 Feb

Keywords

FeZnF
High magnetic fields
Magnetization
Random-field Ising model

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10.1143/JPSJ.71.411

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abstract = "High-field magnetization measurements, with H ≤ 20T, yield the random-field Ising model (RFIM) specific heat behavior near the H-T phase boundary in Fe0.84Zn0.16F2. This sample, with x greater than the magnetic vacancy percolation threshold, Xv = 0.754, is in the concentration range that shows equilibrium neutron scattering line shapes at low temperature and |q| > 0, unlike samples for which x < Xv. The temperature derivative of the uniform magnetization shows the expected low-field random-field Ising scaling behavior for H ≤ 18 T. At H = 20 T, however, the peak temperature and amplitude are significantly suppressed, indicating a high-field RFIM region of the H-T phase diagram.",

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AB - High-field magnetization measurements, with H ≤ 20T, yield the random-field Ising model (RFIM) specific heat behavior near the H-T phase boundary in Fe0.84Zn0.16F2. This sample, with x greater than the magnetic vacancy percolation threshold, Xv = 0.754, is in the concentration range that shows equilibrium neutron scattering line shapes at low temperature and |q| > 0, unlike samples for which x < Xv. The temperature derivative of the uniform magnetization shows the expected low-field random-field Ising scaling behavior for H ≤ 18 T. At H = 20 T, however, the peak temperature and amplitude are significantly suppressed, indicating a high-field RFIM region of the H-T phase diagram.

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Large Random-Field Behavior above the Vacancy Percolation Concentration Threshold: Fe_0.84Zn_0.16F₂

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