Title :
Electrical transport studies on Gd4.5Dy0.5Si2Ge2
Author :
Nirmala, R. ; Sankaranarayanan, V. ; Sethupathi, K. ; Morozkin, A.V. ; Yamamoto, Y. ; Hori, H.
Author_Institution :
Dept. of Phys., Indian Inst. of Technol., Madras, India
Abstract :
A new compound, Dy0.5Gd4.5Si2Ge2, has been synthesized and its electrical transport properties have been studied. Dy is substituted for Gd in Gd5Si2Ge2, due to the fact that Dy has more magnetic entropy in its elemental form among rare earths. Since the parent compound Gd5Si2Ge2 has been found to exhibit giant magnetoresistance near the ferromagnetic transition, magnetoresistance measurements was carried out. AC magnetic susceptibility, electrical resistivity and thermoelectric power were measured. The Dy-substitution in the parent compound was observed to decrease the ferromagnetic ordering temperature. The magnon scattering in the ordered state appears to give rise to large MR.
Keywords :
dysprosium alloys; electrical resistivity; entropy; ferromagnetic materials; gadolinium alloys; germanium alloys; giant magnetoresistance; magnetic susceptibility; magnetocaloric effects; magnons; silicon alloys; thermoelectric power; AC magnetic susceptibility; Gd4.5Dy0.5Si2Ge2; electrical resistivity; electrical transport; ferromagnetic ordering temperature; ferromagnetic transition; giant magnetoresistance; magnetic entropy; magnon scattering; thermoelectric power; Chemical technology; Conductivity; Magnetoresistance; Scattering; Solid state circuits; Temperature;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464486
