Magnetic phase transition and thermal expansion in LaFe13-x-yCoySiz

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dc.contributor.authorWang, JLen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorShamba, Pen_AU
dc.contributor.authorZeng, Ren_AU
dc.contributor.authorDou, SXen_AU
dc.date.accessioned2022-08-19T02:07:01Zen_AU
dc.date.available2022-08-19T02:07:01Zen_AU
dc.date.issued2012-02-02en_AU
dc.date.statistics2021-09-10en_AU
dc.description.abstractThe structural and magnetic properties of a series of LaFe13-x-yCoySix compounds have been investigated by X-ray diffraction, thermal expansion, magnetic and Mössbauer effect measurements. As is evident from the thermal expansion curves of Fig. 1(a), the Curie temperatures of LaFe13-xSix compounds increase with increasing Si content from TC~219 K for x=1.6 to TC~250 K for x=2.6. Further enhancement in the Curie temperature from TC~250 K to TC~281 K is obtained on substitution of Co for Fe in LaFe10.4Si2.6 to LaFe9.4CoSi2.6. A pronounced positive spontaneous volume magnetostriction has been observed below the Curie temperature TC (see Fig. 1(a)). The anomalous thermal expansion can be attributed to the volume dependence of the magnetic energy. Both the magnetization and Mössbauer spectroscopy studies (e.g. Fig. 1(b)) indicate that the type of the magnetic phase transition at TC changes from first order for LaFe11.4Si1.6 to second order for LaFe10.4Si2.6 and LaFe9.4CoSi2.6. The different natures of the magnetic transitions in LaFe13-x-yCoySix are discussed in terms of the classical model for itinerant ferromagnets and the volume dependence of the magnetic energy which is very sensitive to the distance between first-neighbor transition-metal atoms.en_AU
dc.identifier.citationWang, J. L., Campbell, S. J., Kennedy, S. J., Shamba, P., Zeng, R., & Dou, S. X. (2012). Magnetic phase transition and thermal expansion in LaFe13-x-yCoySiz. Poster presented to the 36th Annual Condensed Matter and Materials Meeting, Wagga 2012, Charles Sturt University, Wagga Wagga, NSW 31st January – 3rd February, 2012. Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2012/en_AU
dc.identifier.conferenceenddate3 February 2012en_AU
dc.identifier.conferencename36th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate1 January 2012en_AU
dc.identifier.isbn978-0-646-57071-6en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2012/en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13579en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectPhase transformationsen_AU
dc.subjectThermal expansionen_AU
dc.subjectLanthanumen_AU
dc.subjectIronen_AU
dc.subjectCobalten_AU
dc.subjectSiliconen_AU
dc.subjectCurie pointen_AU
dc.subjectX-ray diffractionen_AU
dc.titleMagnetic phase transition and thermal expansion in LaFe13-x-yCoySizen_AU
dc.typeConference Posteren_AU
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