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Crystal symmetry and pressure effects on the properties of mixed-valence manganites
Umeå University, Faculty of Science and Technology, Physics.
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2003 (English)In: Journal of Magnetism and Magnetic Materials vol. 258-259, Special Issue SI: Proceedings of the 2nd Moscow International Symposium on Magnetism, Amsterdam: Elsevier B.V. , 2003, 312-314 p.Conference paper (Refereed)
Abstract [en]

A lattice structure effect on the magnetic and magnetotransport properties of La0.7Ca(0.3-x)SrxMnO3 lanthanum manganites have been studied. The Curie temperature pressure coefficient increased almost linearly under an applied pressure as dTc/dP=14K/GPa and as dTc/dP=7.5K/GPa in the orthorhombic and rhombohedral structures,respectively. This is caused by the different pressure effect on the Mn–O bond distances and on the Mn–O–Mn bond angles in those phases. The anomalous low value of dTc/dP(=3.5K/GPa) for La0.7Ca0.15Sr0.15MnO3 composition and a jump of the magnetoresistance maximum value at the concentrational Pbnm2R%3c phase transition were observed and discussed.

Place, publisher, year, edition, pages
Amsterdam: Elsevier B.V. , 2003. 312-314 p.
, Journal of Magnetism and Magnetic Materials, ISSN 0304-8853 ; 258-259
Keyword [en]
Magnetic susceptibility, Curie temperature, lanthanum manganites, high pressure, low temperature
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-19199DOI: 10.1016/S0304-8853(02)01152-6OAI: diva2:201563
N. Perov, EditorAvailable from: 2009-03-05 Created: 2009-03-05 Last updated: 2010-01-19

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Sundqvist, Bertil
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Condensed Matter Physics

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