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Phase transitions in Sm 1– x Sr x MnO 3 single crystals (0 ≤ x ≤ 0.8)
Author(s) -
Ivanov V. Yu.,
Mukhin A. A.,
Prokhorov A. S.,
Balbashov A. M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301700
Subject(s) - condensed matter physics , magnetization , ferromagnetism , antiferromagnetism , spontaneous magnetization , materials science , phase diagram , phase transition , anisotropy , néel temperature , magnetic anisotropy , phase (matter) , chemistry , magnetic field , physics , organic chemistry , quantum mechanics
Magnetic and electrical properties of Sm 1– x Sr x MnO 3 (0 ≤ x ≤ 0.8) single crystals have been studied and the T – x phase diagram has been revised. The compensation points of spontaneous weak ferromagnetic moment have been observed for pure SmMnO 3 and for low doped compositions (0 ≤ x < 0.05). For 0.4 ≤ x ≤ 0.475 the ferromagnetic ordering occurs as a first‐order phase transition. It is shown that in a magnetic field the temperature of this transition increases and the transition becomes broader, which results in the appearance of a critical point ( T cr ∼ 193 K, H cr ∼ 68 kOe for x = 0.45). Another transition, accompanied by a reduction of magnetization and noticeable anisotropy of magnetization curves, has been observed at low temperature T s ∼ 40 K. Below the Neel temperature, a pure antiferromagnetic state without spontaneous magnetization has been observed for 0.5 ≤ x ≤ 0.575, while for 0.6 ≤ x ≤ 0.675 an additional low‐temperature transition to a new phase with a non‐zero weak‐ferromagnetic moment has been found.