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Title: Transformations in the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition

Abstract

Temperature dependencies of the dc electrical resistivity, dc magnetization, and heat capacity of virgin Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) samples and after they had been cycled through the first-order phase transition by varying temperature or magnetic field were studied. The virgin sample shows a transition from the low-temperature phase {alpha} to the high-temperature, low-resistance phase {beta}{prime}. After several temperature and/or magnetic field induced cycles of the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy through the first-order phase transition, the {alpha} phase transforms to {beta}'' where {beta}'' is the high-resistance phase. The dc magnetization and zero magnetic field heat capacity data indicate that the temperature of the {alpha}{leftrightarrow}{beta}'' phase transition is lower by {approx}2 K relative to {alpha}{leftrightarrow}{beta}{prime}, while the electrical resistance shows {approx}7 K temperature difference. The observed phenomena are discussed based on the mechanism of the simultaneous magnetic/crystallographic phase transition in Gd{sub 5}(Si{sub x}Ge{sub 4-x}).

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205554
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 63; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevB.63.064426; Othernumber: PRBMDO000063000006064426000001; 064106PRB; PBD: 1 Feb 2001; Journal ID: ISSN 0163-1829
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALLOYS; ELECTRIC CONDUCTIVITY; MAGNETIC FIELDS; MAGNETIZATION; SPECIFIC HEAT; TRANSFORMATIONS

Citation Formats

Levin, E M, Pecharsky, A O, Pecharsky, V K, and Gschneidner, K A. Transformations in the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition. United States: N. p., 2001. Web. doi:10.1103/PhysRevB.63.064426.
Levin, E M, Pecharsky, A O, Pecharsky, V K, & Gschneidner, K A. Transformations in the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition. United States. doi:10.1103/PhysRevB.63.064426.
Levin, E M, Pecharsky, A O, Pecharsky, V K, and Gschneidner, K A. Thu . "Transformations in the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition". United States. doi:10.1103/PhysRevB.63.064426.
@article{osti_40205554,
title = {Transformations in the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition},
author = {Levin, E M and Pecharsky, A O and Pecharsky, V K and Gschneidner, K A},
abstractNote = {Temperature dependencies of the dc electrical resistivity, dc magnetization, and heat capacity of virgin Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) samples and after they had been cycled through the first-order phase transition by varying temperature or magnetic field were studied. The virgin sample shows a transition from the low-temperature phase {alpha} to the high-temperature, low-resistance phase {beta}{prime}. After several temperature and/or magnetic field induced cycles of the Gd{sub 5}(Si{sub 1.95}Ge{sub 2.05}) alloy through the first-order phase transition, the {alpha} phase transforms to {beta}'' where {beta}'' is the high-resistance phase. The dc magnetization and zero magnetic field heat capacity data indicate that the temperature of the {alpha}{leftrightarrow}{beta}'' phase transition is lower by {approx}2 K relative to {alpha}{leftrightarrow}{beta}{prime}, while the electrical resistance shows {approx}7 K temperature difference. The observed phenomena are discussed based on the mechanism of the simultaneous magnetic/crystallographic phase transition in Gd{sub 5}(Si{sub x}Ge{sub 4-x}).},
doi = {10.1103/PhysRevB.63.064426},
journal = {Physical Review B},
issn = {0163-1829},
number = 6,
volume = 63,
place = {United States},
year = {2001},
month = {2}
}