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Structure and pressure effects on the properties of La0.7Ca0.3-xSrxMnO3 manganites.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
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2002 (English)In: Journal of Applied Physics vol. 91: Proceedings of the 46th Annual Conference on Magnetism and Magnetic Materials, Seattle 2001, American Institute of Physics , 2002, 7739-7741 p.Conference paper (Refereed)
Abstract [en]

We report a study of the structure and pressure effects on magnetic and transport properties of a lanthanum manganite, La0.7Ca0.3–xSrxMnO3 (0<=x<=0.3, Deltax = 0.03). The pressure coefficient of the Curie temperature (Tc), dTc/dP, is shown to depend on x. The temperature Tc increases approximately linearly under applied pressure as dTc/dP[approximate]14 K/GPa in the orthorhombic (Pbnm) phase and as dTc/dP[approximate]7.5 K/GPa in the rhombohedral (R3-bar c). The value of dTc/dP shows a minimum ([approximate]3.5 K/GPa) and the temperature of the resistance maximum, Tp(x), shows a change of slope at x = 0.15, corresponding to a concentration structural phase transition. Differences between the values of dTc/dP and the slopes of Tp vs x in Pbnm and R3-bar c phases are explained by the different effect of external pressure on the Mn–O bond length and the Mn–O–Mn bond angle, and by the different internal pressure effect (depending on the value of x) in those phases, respectively.

Place, publisher, year, edition, pages
American Institute of Physics , 2002. 7739-7741 p.
, Journal of Applied Physics, ISSN 0021-8979 ; 91
Keyword [en]
Manganites, high pressure, magnetic properties, resistance, electrical transport properties, lanthanum manganite, LaCaSrMnO3, Curie temperature, orthorhombic structure, rhombohedral structure
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-20772DOI: 10.1063/1.1447293OAI: diva2:209527
Editors R.S. Beach, L. Folks, M.E. McHenry, M.J. O'Shea, M. Pardavi-Horvath, and M.J. Pechan.Available from: 2009-03-25 Created: 2009-03-25 Last updated: 2010-01-20

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Sundqvist, Bertil
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Condensed Matter Physics

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