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Title: Magnetism of Ho 1-xTb xAl₂ alloys: Critical dependence of a first-order transition on Tb concentration

Abstract

HoAl₂ exhibits a first-order spin reorientation transition at 20 K, which is manifested as a sharp peak in the heat capacity. When Ho is partially replaced by only 5% of Tb, the sharp heat-capacity peak in Ho 1-xTb xAl₂ (x = 0.05) disappears, and then reappears again for x ≥ 0.07. For x = 0.05, the anomaly corresponding to the spin reorientation transition is barely seen in the heat capacity, but as x exceeds 0.07 the weak anomaly transforms to a sharp peak. The spin reorientation transition temperature increases to 29 K for x = 0.05, and as x increases further the transition shifts to lower temperature and returns to ~20 K for x = 0.25. The transition is no longer observed when x exceeds 0.60. Temperature-dependent x-ray powder-diffraction data confirm the first-order nature of the spin reorientation transition for the alloy with x = 0.40, and indicate that the compound retains the room-temperature cubic structure within the sensitivity of the technique. Experimental observations are discussed considering the easy magnetization directions of HoAl₂ and TbAl₂.

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1098492
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 21; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., and Pecharsky, V. K.. Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.84.214437.
Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., & Pecharsky, V. K.. Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration. United States. doi:10.1103/PhysRevB.84.214437.
Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., and Pecharsky, V. K.. Tue . "Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration". United States. doi:10.1103/PhysRevB.84.214437.
@article{osti_1098492,
title = {Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration},
author = {Khan, Mahmud and Mudryk, Ya. and Gschneidner, K. A. and Pecharsky, V. K.},
abstractNote = {HoAl₂ exhibits a first-order spin reorientation transition at 20 K, which is manifested as a sharp peak in the heat capacity. When Ho is partially replaced by only 5% of Tb, the sharp heat-capacity peak in Ho1-xTbxAl₂ (x = 0.05) disappears, and then reappears again for x ≥ 0.07. For x = 0.05, the anomaly corresponding to the spin reorientation transition is barely seen in the heat capacity, but as x exceeds 0.07 the weak anomaly transforms to a sharp peak. The spin reorientation transition temperature increases to 29 K for x = 0.05, and as x increases further the transition shifts to lower temperature and returns to ~20 K for x = 0.25. The transition is no longer observed when x exceeds 0.60. Temperature-dependent x-ray powder-diffraction data confirm the first-order nature of the spin reorientation transition for the alloy with x = 0.40, and indicate that the compound retains the room-temperature cubic structure within the sensitivity of the technique. Experimental observations are discussed considering the easy magnetization directions of HoAl₂ and TbAl₂.},
doi = {10.1103/PhysRevB.84.214437},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 21,
volume = 84,
place = {United States},
year = {2011},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevB.84.214437

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Cited by: 4 works
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