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- Title
Phase transformations and magnetotransport properties of the PrSrCoMnO system.
- Authors
Troyanchuk, I.; Chobot, A.; Tereshko, N.; Karpinskii, D.; Efimov, V.; Sikolenko, V.; Henry, P.
- Abstract
The structural, magnetic, and magnetotransport properties of PrSrCoMnO ( x < 0.65) perovskites are studied by magnetization and electrical conductivity measurements in magnetic fields up to 14 T and by neutron diffraction. In the manganese concentration range x < 0.5 and T = 300 K, the crystal structure is described by monoclinic space group I2/ a; at x > 0.5, it is described by orthorhombic space group Imma. When the temperature decreases, a structural transformation without changing the symmetry takes place in all compounds. This transformation is caused by an active role of the inner shells of the praseodymium ion in chemical bond formation. The substitution of manganese for cobalt breaks a long-range ferromagnetic order near x ≈ 0.25, and a metal-dielectric transition occurs at x ≈ 0.15. The negative magnetoresistance is found to be maximal near a critical manganese concentration, where a long-range magnetic order is broken; it reaches 95% in a field of 14 T at T = 10 K for x = 0.2. An unusual dielectric magnetic state with a small spontaneous magnetic moment and a sharp transition into a paramagnetic state at T > 200 K is revealed in the concentration range 0.30 ≤ x ≤ 0.65 in spite of the absence of coherent magnetic neutron scattering. A model is proposed to explain the behavior of the magnetic properties in this phase.
- Subjects
PHASE transitions; PRASEODYMIUM; PEROVSKITE; MAGNETIZATION; MAGNETIC properties of metals; MAGNETIC fields; CHEMICAL structure; ELECTRIC conductivity; MAGNETORESISTANCE; TEMPERATURE effect
- Publication
Journal of Experimental & Theoretical Physics, 2011, Vol 112, Issue 5, p837
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776111030162