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Variation of magnetostriction with temperature in Tb5Si2 2Ge1 8 single crystal

Ring, A. P., Ziegler, H. L., Lograsso, T., Schlagel, D., Snyder, John Evan and Jiles, David 2006. Variation of magnetostriction with temperature in Tb5Si2 2Ge1 8 single crystal. Journal of Applied Physics 99 (8) , 08R104. 10.1063/1.2171951

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Abstract

The Tb5(SixGe4−x) alloy system is similar to the better known Gd5(SixGe4−x), except it has a more complex magnetic and structural phase diagram. Gd5(SixGe1−x)4 has received much attention recently due to its giant magnetocaloric effect, colossal magnetostriction and giant magnetoresistance in the vicinity of a first order combined magnetic-structural phase transition. The magnetostriction changes that accompany the phase transitions of single crystal Tb5(Si2.2Ge1.8) have been investigated at temperatures between 20 and 150 K by measurements of magnetostriction along the a axis. Over this temperature range the shape and slope of the magnetostriction curves change, indicative of changes in the magnetic state, crystal structure, and magnetic anisotropy. The results appear to indicate a phase transition that occurs near 106 K (onset-completion range of 116–100 K). The steepness of the strain transition, its unusual hysteresis, and its temperature dependence appear to indicate a first order phase transition which is activated by applied magnetic field in addition to temperature (see Fig. 1). Magnetostriction measurements at temperature below the transition region appear to indicate a magnetostriction of small overall magnitude (about 30×10−6) but high anisotropy, with anistropy showing considerable temperature dependence.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: terbium alloys, silicon alloys, germanium alloys, magnetostriction, magnetic transitions, magnetocaloric effects, giant magnetoresistance, crystal structure, magnetic anisotropy, magnetic hysteresis
Publisher: American Institute of Physics
ISSN: 0021-8979
Last Modified: 04 Jun 2017 02:54
URI: http://orca-mwe.cf.ac.uk/id/eprint/13634

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