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

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【作者】 赵建军鲁毅浩斯巴雅尔邢茹杨仁福李庆安孙阳成昭华

【Author】 Zhao Jian-Jun a)b) ,Lu Yi a) ,Haosibayar a) ,Xing Rua) ,Yang Ren-Fu b) ,Li Qing-An b) ,Sun Young b) ,and Cheng Zhao-Hua b) a) Department of Physics,Baotou Normal University,Baotou 014030,China b) State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

【机构】 Department of Physics,Baotou Normal UniversityState Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences

【摘要】 Owing to the inhomogeneous state resulting from the doping of a small number of Eu ions into La4/3Sr5/3Mn2O7 ,from the resulting single crystal (La0.8Eu0.2)4/3Sr5/3Mn2O7 we have observed the magnetization jump,the resistivity jump,as well as the relaxation phenomena. For (La0.8Eu0.2)4/3Sr5/3Mn2O7 ,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 La4/3Sr5/3Mn2O7 and cause such interesting behaviours.

【Abstract】 Owing to the inhomogeneous state resulting from the doping of a small number of Eu ions into La4/3Sr5/3Mn2O7 ,from the resulting single crystal (La0.8Eu0.2)4/3Sr5/3Mn2O7 we have observed the magnetization jump,the resistivity jump,as well as the relaxation phenomena. For (La0.8Eu0.2)4/3Sr5/3Mn2O7 ,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 La4/3Sr5/3Mn2O7 and cause such interesting behaviours.

【基金】 supported by the National Natural Science Foundation of China (Grant No 50672126);the Inner Mongolia Natural Science Foundation,China (Grant No 200607010102)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2008年07期
  • 【分类号】O73
  • 【被引频次】13
  • 【下载频次】32
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