Variation of magnetostriction with temperature in Tb5Si2.2Ge1.8 single crystalAmes Laboratory Conference Papers, Posters, and Presentations
Document TypeConference Proceeding
Conference50th Annual Conference on Magnetism and Magnetic Materials
AbstractThe 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 and150 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.
Copyright OwnerAmerican Institute of Physics
Citation InformationA. P. Ring, H. L. Ziegler, Thomas A. Lograsso, Deborah L. Schlagel, et al.. "Variation of magnetostriction with temperature in Tb5Si2.2Ge1.8 single crystal" San Jose, CA(2006)
Available at: http://works.bepress.com/thomas_lograsso/126/