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Elsevier, Physica B: Condensed Matter, 1-4(320), p. 23-25

DOI: 10.1016/s0921-4526(02)00610-5

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Identification of first- and second-order magnetic phase transitions in ferromagnetic perovskites

Journal article published in 2002 by J. Mira ORCID, J. Rivas, F. Rivadulla ORCID, M. A. López Quintela ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

A criterion used for the determination of first- and second-order magnetic phase transitions from purely magnetic methods is applied to manganese perovskites of formula La2/3(Ca1−xSrx)1/3MnO3. A crossover from first- to second-order character at a tolerance factor t=0.92 is found, which also brings about several variations in other physical properties. At t=0.92 a change from orthorhombic to rhombohedral symmetry also takes place. The impossibility of establishing static cooperative Jahn–Teller distortions in the rhombohedral symmetry is suggested as being responsible for the observed behaviour.