Effect of hydrostatic pressure upon the magnetic transitions in the Gd5(SixGe1x)4 giant magnetocaloric compounds: X-ray magnetic circular dichroism study

Y. C Tseng, D. Haskel, J. C. Lang, S. Sinogeikin, Ya. Mudryk, V. K. Pecharsky, and K. A. Gschneidner, Jr.
Phys. Rev. B 76, 014411 – Published 10 July 2007

Abstract

The pressure dependence of the magnetic transitions in the giant magnetocaloric materials Gd5(SixGe1x)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 xT phase diagram are also present in the PT phase diagram. These include a nearly linear increase in Curie temperature, Tc, with increasing both x and P up to 275K, and a discontinuity accompanied by a change in slope, dTcd(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.

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  • Received 27 April 2007

DOI:https://doi.org/10.1103/PhysRevB.76.014411

©2007 American Physical Society

Authors & Affiliations

Y. C Tseng1,2, D. Haskel2,*, J. C. Lang2, S. Sinogeikin3, Ya. Mudryk4, V. K. Pecharsky4, and K. A. Gschneidner, Jr.4

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201, USA
  • 2Magnetic Materials Group, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3HPCAT, Carnegie Institution of Washington, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Materials and Engineering Physics Program, Ames Laboratory, Iowa State University, Iowa 50011, USA

  • *haskel@aps.anl.gov

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Vol. 76, Iss. 1 — 1 July 2007

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