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Effective Medium Approximation for Nonlinear Composite Media

Guoqing GU+ , International Centre for Materials Physics , Academia Sinica , 110015 , Shenyang , ChinaGe CHEN , College of Systems Science and Systems Engineering , Shanghai Institute of Mechanical Engineering , 200093 , ShanghaiK.W.Yu , Department of Physics , Chin

材料科学技术(英文)

We build the perturbation expansion method for nonlinear composite media and extend the EMA for nonlinear effective conductivity. Using the solutions of boundary-value problems of a cylindrical in- clusion, we derive formulae for nonlinear effective conductivity.

关键词: effective medium approximation , null

Intrinsic Localized Modes in an Order-parameter-preserving Antiferromagnet

Wuming LIU+ , Shaoyun FU , Benlian ZHOU , International Centre for Materials Physics , Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China

材料科学技术(英文)

Intrinsic localized modes in an order-parameter-preserving antiferromagnet are investigated with employing the Dyson-Maleev transformation and the coherent-state ansatz. These modes which be- low the magnon frequency band correspond to a local large-angle, low-frequency precessional mo- tion of spins, quantum states of which are characterized by the indefiniteness of the number of rele- vant magnons.

关键词: intrinsic localized mode , null , null

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