| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Tuning Martensitic Phase Transition by Non-Magnetic Atom Vacancy in MnCoGe Alloys and Related Giant Magnetocaloric Effect |
| Li-Fu Bao1**, Wen-Deng Huang1,2, Ya-Jie Ren1 |
1School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723000
2MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049
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| Cite this article: |
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Li-Fu Bao, Wen-Deng Huang, Ya-Jie Ren 2016 Chin. Phys. Lett. 33 077502 |
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Abstract The effects of non-magnetic atom vacancy on structural, martensitic phase transitions and the corresponding magnetocaloric effect in MnCoGe$_{1-x}$ alloys are investigated using x-ray diffraction and magnetic measurements. The introduction of non-magnetic atom vacancy leads to the decrease of the martensitic transition temperature and realizes a temperature window where magnetic and martensitic phase transitions can be tuned together. Moreover, the giant magnetocaloric effect accompanied with the coupled magnetic-structural transition is obtained. It is observed that the peak values of magnetic entropy change of MnCoGe$_{0.97}$ are about $-$13.9, $-$35.1 and $-$47.4 J$\cdot$kg$^{-1}$K$^{-1}$ for $\Delta H=2$, 5, 7 T, respectively.
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Received: 26 January 2016
Published: 01 August 2016
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| PACS: |
75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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75.50.Cc
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(Other ferromagnetic metals and alloys)
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75.60.Ej
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(Magnetization curves, hysteresis, Barkhausen and related effects)
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