Influence of Pressure on Magnetic Properties of La1-x SrxCoO3-δ (x=0.5, 0.67, 1)

J. Piętosaa, A. Wiśniewskia, R. Puźniaka, S. Kolesnikb, M. Majjigab and B. Dabrowskib aInstitute of Physics, Polish Academy of Sciences, al.i Lotników 32/46, 02-668 Warsaw, Poland bPhysics Department, Northern Illinois University, De Kalb, IL 60115, USA

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Received: 25 09 2005;

Influence of pressure on the phase transition temperature T C and on the spontaneous magnetisation M0 of highly Sr substituted and oxygen nonstoichiometric La1-xSrxCoO3-δ samples was investigated. An increase in TC and M0 with pressure in investigated samples was found, indicating strengthening of ferromagnetic double exchange interactions, and the expansion of volume of ferromagnetic phase as a result of enhancement in ferromagnetic interactions in both cluster-glass and long range ferromagnetic states. We did not observe clear correlation between changes in pressure coefficient dTC/dP and changes in the formal oxidation state of the Co ion.

DOI: 10.12693/APhysPolA.109.527 PACS numbers: 75.30.-m, 75.47.Gk, 75.30.Kz