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Magnetic properties and photoinduced magnetism on Y 0.25 Sr 0.75 CoO 3– δ
Author(s) -
Zhang Yufeng,
Sasaki Sho,
Izumi Mitsuru
Publication year - 2007
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.200777296
Subject(s) - magnetization , magnetism , condensed matter physics , thermal hysteresis , ferromagnetism , curie temperature , hysteresis , magnetic hysteresis , materials science , physics , phase transition , magnetic field , quantum mechanics
Magnetic properties and light‐induced magnetism on Y 0.25 Sr 0.75 CoO 3– δ under different sintered temperatures have been investigated. A magnetization jump around 179 K ( T J ) with a thermal hysteresis was found out in Y 0.25 Sr 0.75 CoO 2.688 sintered at 1250 °C. Whereas, there is a hysteresis at the onset of 145 K without magnetization jump appears in Y 0.25 Sr 0.75 CoO 2.626 sintered at 1100 °C together with the larger magnetization and lower Curie temperature. The large magnetization may come from the contribution of the surface/volume ferromagnetism in Co 3+ ions. A light‐induced spin‐state transition of Co 3+ ions from the nonmagnetic low‐spin state ( $ {\rm t}^{6}_{\rm 2g} {\rm e}^{0}_{\rm g} $ ); S = 0) to magnetic intermediate‐spin state ( $ {\rm t}^{5}_{\rm 2g} {\rm e}^{1}_{\rm g} $ ; S = 1) was observed in Y 0.25 Sr 0.75 CoO 2.688 , which increases the magnetization below T J . (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)