Magnetic Field Induced Phase Transitions in Gd(sub 5) (Si(sup 1.95)Ge(sup2.05)) Single Crystal and the Anisotropic Magnetocaloric Effect.

Tang, H. ; Pecharsky, V. K. ; Pecharsky, A. O.

Technical Information Center Oak Ridge Tennessee

关键词: Superconductivity;    Magnetic fields;    Superfluidity;    Magnetism;    Monocrystals;   

RP-ID  :  DE2005832902

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The magnetization measurements using a Gd5(Si1.95Ge2.0.) single crystal with the magnetic field applied along three crystalIographic directions, (OO1), (OlO) and (l00), were carried out as function of applied field (0 - 56 kOe) at various temperatures (Around 5 - 320 K).N The magnetic-field induced phase transformations at temperature above the zero-field critical temperature, i.e. the paramagnetic (PM)Hferromagnetic (FM) transitions with application or removal of magnetic field, are found to be temperature dependent and hysteretic. The corresponding critical fields increase with increasing temperature. The magnetic field (II)-temperature (T) phase diagrams have been constructed for the GdS(Si1.95Ge2,05) single crystal with fieId along the three directions. A small anisotropy has been observed. The magnetocaloric effect (MCE) has been calculated from the isothermal magnetization data, and the observed anisotropy correlates with H-T phase diagrams. The results are discussed in connection with the magnetic-field induced martensitic- like structural transition observed in the Gd5(SizGez)-type compounds.