Magnetoelastic and elastocaloric effects in rare-earth metals,their alloys and compounds in the region of magnetic phase transitions |
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Authors: | S A Nikitin |
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Institution: | 1.Department of General Physics and Condensed Matter Physics, Faculty of Physics,Moscow State University,Moscow,Russia |
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Abstract: | This article discusses experimental data and their theoretical interpretation concerning the volume magnetostriction, spontaneous
magnetostriction, variation of magnetization under the action of pressure, and elastocaloric effects in rare-earth metals,
as well as their alloys and compounds. Particular attention is paid to the region of phase transitions. The volume magnetostriction
ω of true magnetization was investigated near the Curie temperature Θ as a function of magnetization and determined from the
change of magnetostriction under the action of pressure. From these data we obtained the dependence of the exchange integrals
on the unit cell volume. Giant volume magnetostriction and magnetoelastic elastocaloric effects were discovered in the rare-earth
metals and alloys in the region of their magnetic phase transitions. It was established that giant volume magnetostriction
in RCo2 compounds is caused by a critical increase of the magnetic moment of the 3d sublattice of cobalt in magnetic fields that
exceeds the critical field at T > Θ. Giant volume magnetostriction in R2Fe17 compounds near the temperature Θ is shown to occur due to strong deformational dependences of exchange interaction and the
value of the 3d electron bandwidth. |
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Keywords: | |
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