Position: Graduate Student
Tel: 865-974-7838 (Office) 865-946-4132 (home)
Fax: 865-974-7843
Email: schi2@utk.edu
EDUCATION
Sept. 1989 ---July 1993 B.S. in Physics, Yanbian University, Yanji China
August 1999 --- August 2001 M.S. in Physics, Pukyong National University, Pusan, R. Korea
RESEARCH INTEREST
Colossal magnetoresistance (CMR) is a large change in electrical resistance which occurs when a magnetic field is applied to a particular family of oxides, which usually contain Mn. This effect has generated enormous excitement because of its “colossal” magnetotransport properties, rich phase diagrams and intrinsic inhomogeneity.
CMR has also been observed in the Ruddlesden-Popper (RP) phases. The RP phases (Ln, A)n+1MnnO3n+1 can be thought of as stacks of perovskite blocks n layers thick with each block separated by a rock-salt (Sr,Ln)2O2 layer which decouple the blocks electrically and magnetically. The perovskite compounds are realized when n=infinity. The n=1 members of RP family are single-layered and their structure is equivalent to that of the K2NiF4, which consists of an intergrowth of single perovskite and single rock-salt-type layers. For my graduate research, I will be mainly working on Pr1-xCa1+xMnO4, a member of single-layer RP family using neutron scattering as the major tool. I will also work on YBCO superconductors.
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