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Chin. Phys. B, 2010, Vol. 19(5): 057501    DOI: 10.1088/1674-1056/19/5/057501
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds

E. Yüzüaka), B. Emrea), Y. Elermana), and A. Yücelb)
a Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Besevler, Ankara, Turkey; b Faculty of Science and Letters, Physics Department, Mugla University, K?tekli 48000 Mugla, Turkey
Abstract  The crystal structure, magnetic and magnetocaloric characteristics of the pseduo ternary compounds of Tb$_{5}$Ge$_{2-x}$Si$_{2-x}$Mn$_{2x}$ (0 $\leq $ 2$x$ $\leq$ 0.1) were investigated by x-ray powder diffraction and magnetization measurements. The x-ray powder diffraction results show that all compounds preserve the monoclinic phase as the majority phase and all the synthesized compounds were observed to be ferromagnetic from magnetization measurements. Magnetic phase transitions were interpreted in terms of Landau theory. Maximum isothermal magnetic entropy change value (20.84 J$\cdot$kg$^{-1}$$\cdot$K$^{-1}$) was found for Tb$_{5}$Ge$_{1.95}$Si$_{1.95}$Mn$_{0.1}$ at around 123 K in the magnetic field change of 5 T.
Keywords:  magnetic properties      magnetocaloric effect      isothermal magnetic entropy change  
Received:  19 May 2009      Revised:  17 September 2009      Accepted manuscript online: 
PACS:  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  61.05.cp (X-ray diffraction)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  61.66.Dk (Alloys )  
  75.50.Cc (Other ferromagnetic metals and alloys)  
Fund: Project supported by the Scientific and Technological Research Council of Turkey under Project No. 104T382.

Cite this article: 

E. Yüzüak, B. Emre, Y. Elerman, and A. Yücel Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds 2010 Chin. Phys. B 19 057501

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