Phason mode in the incommensurate martensitic phase of Ni2MnGa - observed by neutron spectroscopy

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dc.contributor.authorVorderwisch, Pen_AU
dc.contributor.authorShapiro, SMen_AU
dc.contributor.authorHabicht, Ken_AU
dc.contributor.authorHradil, Ken_AU
dc.contributor.authorSchneider, Hen_AU
dc.date.accessioned2021-09-21T01:30:04Zen_AU
dc.date.available2021-09-21T01:30:04Zen_AU
dc.date.issued2006-12-04en_AU
dc.date.statistics2021-08-31en_AU
dc.description.abstractThe ferromagnetic shape-memory alloy Ni2MnGa, of technological interest as a magnetically driven actuator, undergoes a martensitic transformation from a cubic austenite to a tetragonally distorted martensite structure. Previous inelastic neutron scattering experiments, performed in the martensite phase, show an anomaly in the phonon dispersion for the [110] transverse acoustic branch TA2 [1]. This anomaly is identified (in ab-initio calculations through examination of Fermi-surface nesting and electron-phonon coupling) as a Kohn anomaly [2] and occurs at a wave vector incommensurate with the underlying lattice. Elastic neutron scattering reveals a modulation of the martensite phase with this incommensurate wave vector [1]. In very recent inelastic experiments, performed with cold- and thermal-neutron triple-axis-spectrometers, in addition to the known acoustic branch a new dispersive branch was found, showing all characteristics of a phason mode. In our interpretation, the new mode is caused by a charge-density-wave in the incommensurately distorted lattice. Inelastic neutron scattering is the only technique able to unambiguously detect a phason branch - and successful examples are rare. [1] P. Vorderwisch and S.M. Shapiro, submitted [2] C. Bungaro et al., Phys. Rev. B 68 (2003) 134104en_AU
dc.identifier.citationVorderwisch, P., Shapiro, S., Habicht, K., Hradil, K., & Schneider, H. (2006). Phason mode in the incommensurate martensitic phase of Ni2MnGa - observed by neutron spectroscopy. Paper presented at the Australian Instute of Physics 17th National Congress 2006, Brisbane Convention and Exhibition Centre, Brisbane Australia, Sunday 3 - Friday 8 December 2006. Retrieved from: https://www.aip.org.au/resources/Documents/Congress/AIPCongress-2006-Program.pdfen_AU
dc.identifier.conferenceenddate8 December 2006en_AU
dc.identifier.conferencenameAustralian Instute of Physics 17th National Congress 2006en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate3 December 2006en_AU
dc.identifier.urihttps://www.aip.org.au/resources/Documents/Congress/AIPCongress-2006-Program.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11754en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectFerromagnetic materialsen_AU
dc.subjectAlloysen_AU
dc.subjectActuatorsen_AU
dc.subjectMartensitic steelsen_AU
dc.subjectTransformationsen_AU
dc.subjectAusteniteen_AU
dc.subjectInelastic scatteringen_AU
dc.subjectSpectrometersen_AU
dc.titlePhason mode in the incommensurate martensitic phase of Ni2MnGa - observed by neutron spectroscopyen_AU
dc.typeConference Abstracten_AU
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