Zeeman effects on d-wave superconductor and the coherent tunneling spectrum in normal-metal/d-wave superconductor/normal-metal tunnel junctions |
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Authors: | ZC Dong |
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Institution: | Department of Physics, Huaiyin Teachers College, Huaian 223001, China Department of Physics, Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huaian 223001, China |
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Abstract: | We solve a self-consistent equation for the d-wave superconducting gap and the magnetization in the mean-field approximation, study the Zeeman effects on the thermodynamic potential of d-wave superconductor (S) and coherent quantum transport in normal-metal (N)/d-wave S/N double tunnel junctions. Taking simultaneously into account the electron-injected current from one N electrode and the hole-injected current from the other N electrode, we derive a general formula for the differential conductance in a N/d-wave S/N system under a Zeeman magnetic field on the d-wave S. It is found that oscillations of all quasiparticle transport coefficients and differential conductance with the bias voltage and the thickness of the d-wave S depend to a great extent on the crystal orientation of the d-wave S. In the N/d-wave S/N junctions, the Zeeman magnetic field can lead to the Zeeman splitting of conductance peaks, and the temperature can reduce the coherent effect. |
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Keywords: | 74 50 +r 74 20 Fg 74 25 Ha |
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