TY - JOUR
T1 - Dramatic effects of excess oxygen on physical properties and crystal structure of La0.95Sr0.05MnOy single crystal
AU - Yokota, Yuui
AU - Shimoyama, Jun ichi
AU - Ogata, Tetsuro
AU - Horii, Shigeru
AU - Kishio, Kohji
N1 - Funding Information:
This work was partially supported by the Sasakawa Scientific Research Grant from The Japan Science Society.
PY - 2007/5
Y1 - 2007/5
N2 - We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La0.95Sr0.05MnOy. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, TC, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the TC of crystals with excess oxygen was lower than that of the La1-xSrxMnO3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.
AB - We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La0.95Sr0.05MnOy. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, TC, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the TC of crystals with excess oxygen was lower than that of the La1-xSrxMnO3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.
KW - A. Magnetically ordered materials
KW - B. Crystal growth
KW - C. Crystal structure and symmetry
KW - D. Electronic transport
UR - http://www.scopus.com/inward/record.url?scp=34247530035&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34247530035&partnerID=8YFLogxK
U2 - 10.1016/j.ssc.2007.03.038
DO - 10.1016/j.ssc.2007.03.038
M3 - Article
AN - SCOPUS:34247530035
VL - 142
SP - 429
EP - 433
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 8
ER -