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dc.contributor.authorHaines, Charles
dc.contributor.authorLampronti, Giulio
dc.contributor.authorKlooster, WT
dc.contributor.authorColes, SJ
dc.contributor.authorDutton, S
dc.contributor.authorCarpenter, MA
dc.date.accessioned2020-01-28T00:31:03Z
dc.date.available2020-01-28T00:31:03Z
dc.date.issued2020
dc.identifier.issn0003-004X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/301300
dc.description.abstractWe report the discovery of a low temperature spin-flop transition in 5C pyrrhotite at ~155 K that is similar to those seen in hematite at 260 K and FeS (troilite) at 440 K. The 5C crystal was produced by annealing a 4C pyrrhotite crystal at 875 K, to produce a change in the vacancy-ordering scheme that developed during cooling. The 5C structure is confirmed by single crystal x-ray diffraction and the stoichiometry and homogeneity by electron microprobe and SEM BSE mapping. RUS, heat capacity and magnetisation measurements from room temperature down to 2 K are reported. The transition is marked by a steep change in elastic properties at the transition temperature, a peak in the heat capacity and weak anomalies in measurements of magnetisation. Magnetic hysteresis loops and comparison with the magnetic properties of 4C pyrrhotite suggest that the transition involves a change in orientation of moments between two different antiferromagnetic structures, perpendicular to the crystallographic c-axis at high temperatures and parallel to the crystallographic c-axis at low temperatures. The proposed structures are consistent with a group theoretical treatment that also predicts a first order transition between the magnetic structures.
dc.description.sponsorshipLeverhulme Trust
dc.publisherWalter de Gruyter
dc.rightsAll rights reserved
dc.titleMorin-type transition in 5C pyrrhotite
dc.typeArticle
prism.endingPage1411
prism.issueIdentifier9
prism.publicationNameAmerican Mineralogist: an international journal of earth and planetary materials
prism.startingPage1404
prism.volume105
dc.identifier.doi10.17863/CAM.48381
dcterms.dateAccepted2020-02-26
rioxxterms.versionofrecord10.2138/am-2020-7266
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2020-02-26
dc.contributor.orcidHaines, Charles [0000-0002-1274-8329]
dc.contributor.orcidDutton, Sian [0000-0003-0984-5504]
dc.identifier.eissn1945-3027
dc.publisher.urlhttps://pubs.geoscienceworld.org/msa/ammin/article/105/9/1404/590551/Morin-type-transition-in-5C-pyrrhotite
rioxxterms.typeJournal Article/Review
pubs.funder-project-idLeverhulme Trust (RPG-2016-298)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M000524/1)
pubs.funder-project-idNERC (NE/B505738/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/I036079/1)
cam.issuedOnline2020-09-01
datacite.issupplementedby.doi10.2138/am-2020-7266
cam.orpheus.counter20
rioxxterms.freetoread.startdate2021-09-01


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