Effect of hydrostatic pressure upon the magnetic transitions in the Gd5 (Six Ge1-x) 4 giant magnetocaloric compounds: X-ray magnetic circular dichroism study

Yuan-Chieh Tseng*, D. Haskel, J. C. Lang, S. Sinogeikin, Ya Mudryk, V. K. Pecharsky, K. A. Gschneidner

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The pressure dependence of the magnetic transitions in the giant magnetocaloric materials Gd5 (Six Ge1-x) 4 (x=0.125,0.5) has been investigated using x-ray magnetic circular dichroism (XMCD) measurements in a diamond anvil cell (DAC). We found that the most notable features of the x-T phase diagram are also present in the P-T phase diagram. These include a nearly linear increase in Curie temperature, Tc, with increasing both x and P up to 275 K, and a discontinuity accompanied by a change in slope, d Tc /d (x,P), at this temperature. However, the results indicate that a similar volume change results in ∼3 times larger increase in Tc with Si doping than with pressure. Si doping, hence, does more to stabilize ferromagnetic interactions than simply uniformly reducing the unit cell volume.

Original languageEnglish
Article number014411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number1
DOIs
StatePublished - 10 Jul 2007

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