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Magnetocaloric effect across the metamagnetic transition in Dy5Si2Ge2 single crystal

Title
Magnetocaloric effect across the metamagnetic transition in Dy5Si2Ge2 single crystal
Authors
Nirmala, R.Lee, Chan IkKwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2018-02
Citation
Journal of Magnetism and Magnetic Materials, 448, 19-22
Type
Article
Article Type
Article; Proceedings Paper
Keywords
Antiferromagnetic Ordering TemperatureAntiferromagnetismEarth (Planet)Easy Direction of MagnetizationsEntropyIntermetallicsIsothermal Magnetic Entropy ChangeMagnetic Entropy ChangeMagnetic PropertiesMagnetismMagnetizationMagnetocaloric EffectMagnetocaloric Effects (MCE)Metamagnetic TransitionsPolycrystallineRare Earth AlloysRare Earth CompoundsRare Earth Intermetallic CompoundsRare Earth Intermetallic Compounds and AlloysRare EarthsSingle CrystalsSoldering AlloysTemperature Dependent
ISSN
0304-8853
Abstract
A single crystal of rare earth intermetallic compound Dy5Si2Ge2 (Orthorhombic, Space group Pnma) has been prepared by Czochralski method. Magnetization of Dy5Si2Ge2 single crystal has been measured with magnetic field applied (i) along b axis and (ii) parallel to ac plane. Although a same Neél temperature (TN) of ∼55K is obtained when 50 Oe field is applied along b axis and in ac plane, the magnitude of magnetization is substantially different. This TN value is close to the antiferromagnetic ordering temperature of polycrystalline Dy5Si2Ge2 as well. The magnetization vs field data at 1.8K shows an ultra-sharp metamagnetic transition when field is applied along both the directions, in a critical field of about 28 kOe. It is observed that b axis is easy direction of magnetization. Magnetocaloric effect of this Dy5Si2Ge2 crystal has been estimated using magnetization vs field data obtained at various temperatures. A maximum magnetic entropy change (δSm max) of ∼-15.6J/kg/K has been observed at 22K with field along b axis and δSm max is ∼-11.2J/kg/K at 54K when field is parallel to ac plane, for a field change of 50 kOe. Occurrence of metamagnetic transition at temperatures below TN gives rise to a second peak at ∼22K in the temperature dependent isothermal magnetic entropy change that leads to the observed large magnetocaloric effect. © 2017 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5038
DOI
10.1016/j.jmmm.2017.06.100
Publisher
Elsevier B.V.
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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