Successive inverse and normal magnetocaloric effects in the Mn-vacancy compound Mn0.95Co0.75Cu0.25Ge

Ferromagnetic-structural transformation has been studied widely in MnCoGe-based materials. However, the magnetostructural transition (MST) from antiferromagnetic (AFM) orthorhombic phase to ferromagnetic (FM) hexagonal phase, which may lead to a large inverse magnetocaloric effect (MCE), has rarely...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2020-07, Vol.63 (7), p.277511, Article 277511
Main Authors: Liu, FengXia, Zhang, Hu, Zhou, He, Cong, DaoYong, Huang, RongJin, Wang, LiChen, Long, Yi
Format: Article
Language:English
Subjects:
Antiferromagnetism
Astronomy
Classical and Continuum Physics
Cooling
Critical temperature
Cryostats
Crystal structure
Electrons
Ferromagnetic materials
Hexagonal phase
Incubators
Magnetic fields
Observations and Techniques
Orthorhombic phase
Phase transitions
Physics
Physics and Astronomy
Science
Temperature
Thermostats
Transition temperature
Transition temperatures
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Summary:Ferromagnetic-structural transformation has been studied widely in MnCoGe-based materials. However, the magnetostructural transition (MST) from antiferromagnetic (AFM) orthorhombic phase to ferromagnetic (FM) hexagonal phase, which may lead to a large inverse magnetocaloric effect (MCE), has rarely been reported. Here, the introduction of Mn vacancy lowers the structural transition temperature while retains the AFM state in the orthorhombic phase, thus successfully realizing the AFM-FM MST in Mn 0.95 Co 0.75 Cu 0.25 Ge. Moreover, successive inverse and normal MCEs are observed around the first-order AFM-FM MST and the second-order FM-paramagnetic (PM) transition, respectively. A thermostat is proposed based on this special feature, which could release heat above the critical temperature while absorb heat below the critical temperature by simply applying the same magnetization/demagnetization cycles. This thermostat can be very useful in many applications where a constant temperature is required, such as cryostats and incubators.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-020-1536-5