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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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Driving magnetostructural transitions in layered intermetallic compounds.

J L Wang1, L Caron, S J Campbell

  • 1Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia. jianli@uow.edu.au

Physical Review Letters
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

Applied pressure and magnetic fields dramatically alter the magnetic transitions in Pr(0.5)Y(0.5)Mn(2)Ge(2). Pressure induces a giant magnetocaloric effect, enhancing entropy change at low temperatures due to strong magnetoelastic coupling.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Layered intermetallic compounds exhibit complex magnetic behaviors.
  • Pr(0.5)Y(0.5)Mn(2)Ge(2) displays room-temperature ferromagnetism and undergoes two first-order magnetic transitions (FOMT) to antiferromagnetic and then ferromagnetic states.
  • Understanding these transitions is crucial for developing advanced magnetic materials.

Purpose of the Study:

  • To investigate the influence of applied pressure and magnetic field on the magnetic properties of Pr(0.5)Y(0.5)Mn(2)Ge(2).
  • To explore the magnetocaloric effect under pressure.
  • To elucidate the underlying physical mechanisms responsible for the observed magnetic behavior.

Main Methods:

  • Experimental synthesis and characterization of Pr(0.5)Y(0.5)Mn(2)Ge(2).
  • Measurements of magnetic properties under varying temperature, pressure, and magnetic field.
  • First-principles calculations using density functional theory (DFT).

Main Results:

  • Applied magnetic fields shift the magnetic transitions closer, while pressure separates them.
  • A giant magnetocaloric effect was observed under pressure, with a threefold increase in entropy change at the lower transition.
  • DFT calculations revealed strong magnetoelastic coupling of manganese layers as the origin of the observed phenomena.

Conclusions:

  • The magnetic behavior of Pr(0.5)Y(0.5)Mn(2)Ge(2) is highly sensitive to external stimuli like pressure and magnetic fields.
  • Significant magnetocaloric effects can be achieved by applying pressure, highlighting potential applications in magnetic refrigeration.
  • The strong magnetoelastic coupling is key to understanding and potentially tuning the magnetic properties of this class of materials.