Origin and tuning of the magnetocaloric effect for the magnetic refrigerant MnFe(P1-xGex)

Details Origin and tuning of the magnetocaloric effect for the magnetic refrigerant MnFe(P1-xGex) Origin and tuning of the magnetocaloric effect for the magnetic refrigerant MnFe(P1-xGex)

2008-07-23

arxiv.org/abs/0807.3707v2

Phys. Rev. B79, 014435 (2009)

Physics

Condensed Matter

Materials Science

6 Figures. One table

Scientific paper

10.1103/PhysRevB.79.014435

Neutron diffraction and magnetization measurements of the magneto refrigerant Mn1+yFe1-yP1-xGex reveal that the ferromagnetic and paramagnetic phases correspond to two very distinct crystal structures, with the magnetic entropy change as a function of magnetic field or temperature being directly controlled by the phase fraction of this first-order transition. By tuning the physical properties of this system we have achieved a maximum magnetic entropy change exceeding 74 J/Kg K for both increasing and decreasing field, more than twice the value of the previous record.

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