Spontaneous magnetization and resistivity jumps in bilayered manganite （La0.8Eu0.2）4/3Sr5/3Mn2O7 single crystals

Owing to the inhomogeneous state resulting from the doping of a small number of Eu ions into Laa/3Sr5/3Mn2O7, from the resulting single crystal （La0.8Eu0.2）a/3Sr5/3Mn2O7 we have observed the magnetization jump, the resistivity jump, as well as the relaxation phenomena. For （Lao.sEuo.2）a/3Sr5/3Mn2O7, it has a very delicate ground state due to the interplays among spin, charge, orbital, lattice degrees of freedom. Consequently, the magnetization state is sensitive to temperature, magnetic field, as well as time. Meanwhile, the evolution of the magnetization with time shows a spontaneous jump when both the temperature and the magnetic field are constant. Similar step-like behaviours are also observed in resistivity. All these results suggest that Eu doping can greatly modulate the physical properties of Laa/3Sr5/3Mn2O7 and cause such interesting behaviours.

Spontaneous magnetization and resistivity jumps in bilayered manganite (La0.8Eu0.2)4/3Sr5/3Mn2O7 single crystals

Owing to the inhomogeneous state resulting from the doping of asmall number of Eu ions into Lamanganite, magnetization jump,resistivity jump, relaxationProject supportedby the National Natural Science Foundation of China (Grant No50672126) and the Inner Mongolia Natural Science Foundation, China(Grant No 200607010102).7530G, 7600, 7530K9/7/2007 12:00:00 AMOwing to the inhomogeneous state resulting from the doping of asmall number of Eu ions into Lamanganite, magnetization jump,resistivity jump, relaxationProject supportedby the National Natural Science Foundation of China (Grant No50672126) and the Inner Mongolia Natural Science Foundation, China(Grant No 200607010102).7530G, 7600, 7530K9/7/2007 12:00:00 AMOwing to the inhomogeneous state resulting from the doping of asmall number of Eu ions into La$_{4 / 3}$Sr$_{5 /3}$Mn$_{2}$O$_{7}$, from the resulting single crystal(La$_{0.8}$Eu$_{0.2})_{4 / 3}$Sr$_{5 / 3}$Mn$_{2}$O$_{7}$ we haveobserved the magnetization jump, the resistivity jump, as well asthe relaxation phenomena. For (La$_{0.8}$Eu$_{0.2})_{4 / 3}$Sr$_{5 /3}$Mn$_{2}$O$_{7}$, it has a very delicate ground state due to theinterplays among spin, charge, orbital, lattice degrees of freedom.Consequently, the magnetization state is sensitive to temperature,magnetic field, as well as time. Meanwhile, the evolution of themagnetization with time shows a spontaneous jump when both thetemperature and the magnetic field are constant. Similar step-likebehaviours are also observed in resistivity. All these resultssuggest that Eu doping can greatly modulate the physical propertiesof La$_{4 / 3}$Sr$_{5 / 3}$Mn$_{2}$O$_{7}$ and cause suchinteresting behaviours.