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Magnatic field induced phase transition and transport properties in phase separated Eu0.5Sr0.5MnO3 system

Shu Miao-Miao Cao Shi-Xun Gao Tian Yuan Shu-Juan Kang Bao-Juan Yu Li-Ming Zhang Jin-Cang

Magnatic field induced phase transition and transport properties in phase separated Eu0.5Sr0.5MnO3 system

Shu Miao-Miao, Cao Shi-Xun, Gao Tian, Yuan Shu-Juan, Kang Bao-Juan, Yu Li-Ming, Zhang Jin-Cang
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  • Received Date:  12 June 2008
  • Accepted Date:  03 August 2008
  • Published Online:  20 May 2009

Magnatic field induced phase transition and transport properties in phase separated Eu0.5Sr0.5MnO3 system

  • 1. 上海大学理学院物理系,上海 200444

Abstract: The structure,electrical and magnetic properties of the half doping phase separated Eu0.5Sr0.5MnO3 manganite have been systematically studied. The results show that Eu0.5Sr0.5MnO3 compound has the O′ orthorhombic structure and shows typical Jahn-Teller distortion. It is found that ferromagnetic phase turn up near 75 K and evident split of field cooling (FC) and zero field cooling (ZFC) under 4000 A/m is observed around 42 K. The ac susceptibility curve shows also a sharp peak around 42 K,indicating cluster-glass state rather than a spin glass state at 42 K. Meanwhile,throughout the measuring temperature range,the electric transport shows insulating behavior and there is no insulator-metal (I-M) transition. However,an applied magnetic field of 1.6×105 A/m can induce I-M transition. The conducting behavior of Eu0.5Sr0.5MnO3 is well fitted by the Mott variable range hopping (VRH) model. All these phenomena indicate that for the ground state of Eu0.5Sr0.5MnO3,there exists the competition mechanism of several complex magnetic interactions. The study provides abundant experimental information to underdtand the mechanism of the strongly electron correlated system.

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