Relationship between the Spontaneous Magnetization, Spontaneous Magnetostriction and Heat Capacity in the Compound Mn5Ge3

S.M. Podgonykh; K.E. Bolotin

doi:10.4028/www.scientific.net/SSP.168-169.153

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Relationship between the Spontaneous Magnetization, Spontaneous Magnetostriction and Heat Capacity in the Compound Mn₅Ge₃

Abstract:

Spontaneous magnetization Ms of the ferromagnetic compound Mn5Ge3 with the Curie temperature TC=305 K has been studied in the temperature range from 2 to 400 K. The relationships between the magnetic part of the heat capacity (CMAG), the magnetic part of the volume thermal expansion coefficient (TEC) MAG, and the Ms for the compound Mn5Ge3 have been considered. It has been found that the magnetic part of the heat capacity can be well approximated by the dependence CMAG(T)=a×|dMs2/dT|–b×|dMs4/dT| with a>0 and b>0, and the magnetic part of the TEC, by the dependence  MAG=C1×dMs2/dT+C2×dMs4/dT with C1<0 and C2>0 in the whole temperature. It is assumed that the main sources in the formation of the observed CMAG(T) and MAG(T) dependences are the changes in the elastic, magnetoelastic, magnetovolume, and magnetostatic energies of the sample that appear as a result of the spontaneous magnetostrictive deformation with temperature changing.

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Periodical:

Solid State Phenomena (Volumes 168-169)

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153-156

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https://doi.org/10.4028/www.scientific.net/SSP.168-169.153

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Online since:

December 2010

Authors:

S.M. Podgonykh, K.E. Bolotin

Keywords:

Heat Capacity, Mn Alloys, Spontaneous Magnetization, Spontaneous Magnetostriction, Thermal Expansion

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