Magnetic structures of magnetocaloric (Mn1-xNix)CoGe and Mn(Co1-xNix)Ge alloys

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dc.contributor.authorRen, QYen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorLee, WTen_AU
dc.contributor.authorCadogan, JMen_AU
dc.contributor.authorCampbell, SJen_AU
dc.date.accessioned2021-10-26T22:09:51Zen_AU
dc.date.available2021-10-26T22:09:51Zen_AU
dc.date.issued2016-11-29en_AU
dc.date.statistics2021-10-12en_AU
dc.description.abstractThe magnetocaloric effect (MCE) - a significant temperature change around the magnetic transitions in materials driven by magnetisation or demagnetisation - has emerged as an increasingly important topic in condensed matter physics in the past two decades. This development is due primarily to potential applications in refrigeration as an alternative to gas-based compression-expansion refrigeration [1]. A large MCE occurs generally around a magnetic transition, especially when the magnetic transition coincides with a structural transition (magneto-structural transition) [1]. MnCoGe-based compounds offer particular scope for MCE applications, particularly for cooling around room temperature with previous studies having shown that it is relatively straightforward to engineer the structural transition temperature and thereby produce a magneto-structural transition [2]. In the present work, a series of (Mn1-xNix)CoGe (x = 0.0-0.07) and Mn(Co1-xNix)Ge (x = 0.14-1.00) samples have been prepared in order to investigate the effects of doping the Mn and Co sites of MnCoGe with Ni. The crystal structures and magnetisation were measured using XRD (20-310 K) and PPMS (5-320 K) with the magneto-structural transitions studied using neutron powder diffraction and polarised neutron diffraction (5-450 K; WOMBAT, OPAL). Magneto-structural transitions from ferromagnetic-orthorhombic (FM-Orth) structure to paramagnetic-hexagonal (PM-Hex) structure were obtained in both (Mn1-xNix)CoGe and Mn(Co1-xNix)Ge around room temperature. A spiral antiferromagnetic (SP-AFM) structure was also observed in the orthorhombic structure of Mn(Co1-xNix)Ge (x ≥ 0.55) at low temperature, following by a magnetic transition from SP-AFM to FM at higher temperature. In addition, the influence of magnetic field on the FM-Orth/PM-Hex magneto-structural transition was studied using field dependent neutron diffraction (5-320 K; 0-9 T). Our investigations show that normal (inverse) MCE are obtained around the FM-Orth/PM-Hex (SP-AFM/FM) transitions in (Mn1-xNix)CoGe and Mn(Co1-xNix)Ge.en_AU
dc.identifier.citationRen, Q. Y., Hutchison, W. D., Wang, J. L., Studer, A. J., Lee, W. T., Cadogan, J. M., & Campbell, S. J. (2016). Magnetic structures of magnetocaloric (Mn1-xNix)CoGe and Mn(Co1-xNix)Ge alloys. Paper presented at 13th AINSE-ANBUG Neutron Scattering Symposium, Sydney, NSW, Australia, 29-30 November 2016.en_AU
dc.identifier.conferenceenddate30 November 2016en_AU
dc.identifier.conferencename13th AINSE-ANBUG Neutron Scattering Symposiumen_AU
dc.identifier.conferenceplaceSydney, NSW, Australiaen_AU
dc.identifier.conferencestartdate29 November 2016en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12104en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectMagnetizationen_AU
dc.subjectCrystal structureen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectMagnetic fieldsen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectOrthorhombic latticesen_AU
dc.titleMagnetic structures of magnetocaloric (Mn1-xNix)CoGe and Mn(Co1-xNix)Ge alloysen_AU
dc.typeConference Abstracten_AU
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