A quantum multi-critical point in CeCu6−xAux

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dc.contributor.authorRobinson, RAen_AU
dc.contributor.authorGoossens, DJen_AU
dc.contributor.authorTorikachvili, MSen_AU
dc.contributor.authorKakurai, Ken_AU
dc.contributor.authorOkumura, Hen_AU
dc.date.accessioned2022-11-30T01:45:45Zen_AU
dc.date.available2022-11-30T01:45:45Zen_AU
dc.date.issued2006-11-15en_AU
dc.date.statistics2022-05-10en_AU
dc.descriptionPhysical copy held by ANSTO Library at DDC 539.7213/3. Part Ien_AU
dc.description.abstractCeCu6−xAux is a well-known heavy-fermion system in which the ground state is antiferromagnetically ordered for x>0.1 and temperatures below 1 K. Non-Fermi liquid behaviour occurs around this critical concentration. The parent compound, CeCu6, exhibits a structural phase transition near 230 K, where it changes from the Pnma orthorhombic room-temperature structure to the P21/c monoclinic structure. The monoclinicity increases as temperature falls, with β reaching 91.44° at 10 K. In the work presented here, powder neutron diffraction is used to explore the monoclinicity at 8 K as a function of composition for 0.0<x<0.08, just short of the critical concentration. Extrapolation of the square of the monoclinic strain, (ac cosβ)2, suggests that the distortion vanishes at x=0.13. A reanalysis of single-crystal diffraction data on the magnetically ordered side of the phase diagram, x>0.1, indicates that long-range order disappears at exactly the same critical concentration. At a minimum, the structural distortion and antiferromagnetism seem to be competing with each other, and this raises the intriguing possibility that lattice degrees of freedom are important in the non-Fermi liquid regime.en_AU
dc.identifier.citationRobinson, R. A., Goossens, D. J., Torikachvili, M. S., Kakurai, K., & Okumura, H. (2006). A quantum multi-critical point in CeCu6−xAux. Paper presented at the Eighth International Conference on Neutron Scattering (ICNS 2005), "Neutrons for structure and dynamics - a new era", Sydney, Australia, 27 November to 2 December 2005. In Campbell, S. J., Cadogan, J. M., Furusaka, M., Hauser, N., & James, M. (Eds), Physica B: Condensed Matter, 385-386(Part 1), 38-40. doi:10.1016/j.physb.2006.05.095en_AU
dc.identifier.conferenceenddate2 December 2005en_AU
dc.identifier.conferencenameEighth International Conference on Neutron Scattering ICNS 2005: 'Neutrons for structure and dynamics - a new eraen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate27 November 2005en_AU
dc.identifier.editorsCampbell, S. J., Cadogan, J. M., Furusaka, M., Hauser, N., & James, M.en_AU
dc.identifier.issn0921-4526en_AU
dc.identifier.issuePart 1en_AU
dc.identifier.journaltitlePhysica B: Condensed Matteren_AU
dc.identifier.pagination38-40en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14123en_AU
dc.identifier.volume385-386en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectCrystal latticesen_AU
dc.subjectCrystal structureen_AU
dc.subjectDiffractionen_AU
dc.subjectDimensionless numbersen_AU
dc.subjectElectrodynamicsen_AU
dc.subjectEnergy levelsen_AU
dc.subjectMagnetismen_AU
dc.subjectQuantum field theoryen_AU
dc.subjectRare earth alloysen_AU
dc.subjectScatteringen_AU
dc.titleA quantum multi-critical point in CeCu6−xAuxen_AU
dc.typeConference Paperen_AU
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