Open AccessMagnetic and electrical properties of layered perovskite La1.3Sr1.7Mn1-xCuxO7
Author(s) -
韩立安,
陈长乐,
董慧迎,
王建元,
高国棉,
罗炳成
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.541
Subject(s) - antiferromagnetism , magnetoresistance , ferromagnetism , electrical resistivity and conductivity , condensed matter physics , perovskite (structure) , materials science , doping , metal–insulator transition , crystallite , colossal magnetoresistance , crystallography , physics , metal , chemistry , magnetic field , metallurgy , quantum mechanics
Magnetic and electrical properties of polycrystalline La1.3Sr1.7Mn2-xCuxO7 prepared by solid state reaction were investigated. The X-ray diffraction pattern shows that the two samples have Sr3Ti2O7 type perovskite structure. The two samples undergo complex transition with lowering temperature. The x=0 samples, have the two-dimensional short-range ferromagnetic order at T*=231 K and then transform to the three-dimensional long-rangs ferromagnetic state at TC=114 K, at last they enter the canted antiferromagnetic state at TN=56K. The T*, TC and TN are all reduced at the 5% Cu doping level. Additionally, the two samples exhibited two distinct resistivity peaks, which is due to coexistence of the two phases. The metal-insulator transition temperature was decreased but the magnetoresistance was enhanced at the 5% Cu doping level.