Origin and tuning of the magnetocaloric effect for the magnetic refrigerant MnFe(P1-xGex)
Autor: | Liu, Danmin, Zhang, Ming Yue Jiuxing, McQueen, T. M., Lynn, Jeffrey W., Wang, Xiaolu, Chen, Ying, Li, Jiying, Cava, R. J., Liu, Xubo, Altounian, Zaven, Huang, Qingzhen |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | Phys. Rev. B79, 014435 (2009) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevB.79.014435 |
Popis: | 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. Comment: 6 Figures. One table |
Databáze: | arXiv |
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