Magnetic and structural transitions tuned through valence electron concentration in magnetocaloric Mn(Co1–xNix)Ge

Simple item page
dc.contributor.authorRen, QYen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorCampbell, SJen_AU
dc.date.accessioned2025-02-13T00:33:33Zen_AU
dc.date.available2025-02-13T00:33:33Zen_AU
dc.date.issued2018-02en_AU
dc.date.statistics2025-02-12en_AU
dc.description.abstractThe structural and magnetic properties of magnetocaloric Mn(Co1-xNix)Ge compounds have been studied. Two responses to the increase of valence electron concentration on substitution of Ni (3d84s2) for Co (3d74s2) in the orthorhombic phase (Pnma) are proposed: expansion of unit-cell volume and redistribution of valence electrons. We present experimental evidence for electronic redistribution associated with the competition between magnetism and bonding. This competition in turn leads to complex dependences of the reverse martensitic transformation temperature TM (orthorhombic to hexagonal (P63/mmc)) and the magnetic structures on the Ni concentration. Magnetic transitions from ferromagnetic structures below x = 0.50 to noncollinear spiral antiferromagnetic structures above x = 0.55 at low temperature (e.g., 5 K) are induced by modification of the density of states at the Fermi surface due to the redistribution of valence electrons. TM is found to decrease initially with increasing Ni content and then increase. Both direct and inverse magnetocaloric effects are observed. © 2018 American Chemical Society.en_AU
dc.description.sponsorshipThis work was supported in part by grants from the Australian Research Council: Discovery project DP110102386 and LIEF grant LE1001000177. QYR is grateful to the UNSW Canberra for a Research Training Scholarship and the support from the National Natural Science Foundation of China (Grant No. 11774223). The authors thank Professor J. M. Cadogan, UNSW Canberra, for helpful discussions, particularly his assistance with aspects of the Rietveld refinements.en_AU
dc.identifier.citationRen, Q., Hutchison, W. D., Wang, J., Studer, A. J., & Campbell, S. J. (2018). Magnetic and structural transitions tuned through valence electron concentration in magnetocaloric Mn(Co1–xNix)Ge. Chemistry of Materials, 30(4), 1324-1334. doi:10.1021/acs.chemmater.7b04970en_AU
dc.identifier.issn0897-4756en_AU
dc.identifier.issn1520-5002en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleChemistry of Materialsen_AU
dc.identifier.pagination1324-1334en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.chemmater.7b04970en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15975en_AU
dc.identifier.volume30en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectMictomagnetismen_AU
dc.subjectCobalten_AU
dc.subjectNickelen_AU
dc.subjectGermaniumen_AU
dc.subjectElectronsen_AU
dc.subjectFerromagnetismen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectPhase transformationsen_AU
dc.subjectMetalsen_AU
dc.subjectTemperature rangeen_AU
dc.subjectCrystal structureen_AU
dc.subjectMagnetic momentsen_AU
dc.titleMagnetic and structural transitions tuned through valence electron concentration in magnetocaloric Mn(Co1–xNix)Geen_AU
dc.typeJournal Articleen_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
cm7b04970_si_001.pdf
Size:
2.96 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.66 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles