This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and th...This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and thermodynamic potential. The Josephson currents in the d-wave superconductor（S）/insulating layer（I）/d-wave S junctions are calculated as a function of the temperature, exchange field, and insulating barrier strength under a Zeeman magnetic field on the two d-wave Ss. It is found that the Josephson critical currents in d-wave S/d-wave S junction to a great extent depend on the relative orientation of the effective exchange field of the two S electrodes, and the crystal orientation of the d-wave S. The exchange field under certain conditions can enhance the Josephson critical current in a d-wave S/I/d-wave S junction.展开更多
We study the Zeeman effect on the d-wave superconductor and tunneling spectrum in normal-metal(N)/d-wave superconductor(S) junction by applying a Zeeman magnetic field to the S. It is shown that: (1) the Zeeman magnet...We study the Zeeman effect on the d-wave superconductor and tunneling spectrum in normal-metal(N)/d-wave superconductor(S) junction by applying a Zeeman magnetic field to the S. It is shown that: (1) the Zeeman magnetic field can lead to the S gap decreasing, and with the increase in Zeeman energy, the superconducting state is changed to the normal state, exhibiting a first-order phase transition; (2) the Zeeman magnetic field may make the zero-bias conductance peak split into two peaks, and the energy difference between the two splitting peaks in the conductance spectrum is equal to 2h0 (h0 is the Zeeman energy); (3) both the barrier strength of interface scattering and the temperature can lower the magnitudes of splitting peaks, of which the barrier strength can lead to the splitting peaks becoming sharp and the temperature can smear out the peaks, however, neither of them can influence the Zeeman effect.展开更多
考虑到准粒子的有限寿命效应,在Blonder-Tinkham-Klapw ijk(BTK)理论框架下,通过求解Bogo liubov-de G ennes(BdG)方程,计算正常金属/dx2-y2+idxy混合波超导隧道结中的准粒子输运系数与隧道谱.结果表明:准粒子的有限寿命效应不仅能压低...考虑到准粒子的有限寿命效应,在Blonder-Tinkham-Klapw ijk(BTK)理论框架下,通过求解Bogo liubov-de G ennes(BdG)方程,计算正常金属/dx2-y2+idxy混合波超导隧道结中的准粒子输运系数与隧道谱.结果表明:准粒子的有限寿命效应不仅能压低隧道谱中的电导峰,而且可以有效地阻止峰的滑移;随着非弹性散射的增强,还会在零偏压处形成一宽峰.展开更多
基金supported by the Natural Science Foundation of Education Bureau of Jiangsu Province of China (Grant No 05KJB140008)the '333' Project Funds of Jiangsu Province of China
文摘This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and thermodynamic potential. The Josephson currents in the d-wave superconductor（S）/insulating layer（I）/d-wave S junctions are calculated as a function of the temperature, exchange field, and insulating barrier strength under a Zeeman magnetic field on the two d-wave Ss. It is found that the Josephson critical currents in d-wave S/d-wave S junction to a great extent depend on the relative orientation of the effective exchange field of the two S electrodes, and the crystal orientation of the d-wave S. The exchange field under certain conditions can enhance the Josephson critical current in a d-wave S/I/d-wave S junction.
基金The author thanks Professor D.Y. Xing for useful discussion. This work is supported by the Jiangsu Planned Projects for Postdoctoral Research Funds, the Natural Science Foundation of Education Bureau of Jiangsu Province of China (Grant No. 05KJB 14008).
文摘We study the Zeeman effect on the d-wave superconductor and tunneling spectrum in normal-metal(N)/d-wave superconductor(S) junction by applying a Zeeman magnetic field to the S. It is shown that: (1) the Zeeman magnetic field can lead to the S gap decreasing, and with the increase in Zeeman energy, the superconducting state is changed to the normal state, exhibiting a first-order phase transition; (2) the Zeeman magnetic field may make the zero-bias conductance peak split into two peaks, and the energy difference between the two splitting peaks in the conductance spectrum is equal to 2h0 (h0 is the Zeeman energy); (3) both the barrier strength of interface scattering and the temperature can lower the magnitudes of splitting peaks, of which the barrier strength can lead to the splitting peaks becoming sharp and the temperature can smear out the peaks, however, neither of them can influence the Zeeman effect.
文摘考虑到准粒子的有限寿命效应,在Blonder-Tinkham-Klapw ijk(BTK)理论框架下,通过求解Bogo liubov-de G ennes(BdG)方程,计算正常金属/dx2-y2+idxy混合波超导隧道结中的准粒子输运系数与隧道谱.结果表明:准粒子的有限寿命效应不仅能压低隧道谱中的电导峰,而且可以有效地阻止峰的滑移;随着非弹性散射的增强,还会在零偏压处形成一宽峰.
