论文信息 - Effect of dc electric field on the effective microwave surface impedance of YBa2Cu3O7/SrTiO3/YBa2Cu3O7 trilayers

Effect of dc electric field on the effective microwave surface impedance of YBa2Cu3O7/SrTiO3/YBa2Cu3O7 trilayers

We have studied the effect of a dc electric field on the effective microwave surface impedance of a thin film YBa2Cu3O7/SrTiO3/YBa2Cu3O7 (YBCO/STO/YBCO) trilayer by a dielectric resonator technique. At large dc electric fields (≳105 V/cm), both the effective surface resistance and reactance of the sample decrease monotonically with increasing dc voltage applied to the to YBCO film, yielding at 25 K and 24.7 GHz ‖δRs/δVdc‖∼0.25 μΩ/V and ‖δXs/δVdc‖∼1.8 μΩ/V, respectively. A two‐fluid analysis indicates that the changes in the surface impedance can be explained in terms of field induced changes in the superconducting carrier density of the top YBCO film.

[1] C. Mead,et al. Permittivity of Strontium Titanate , 1972 .

[2] K. Müller,et al. Electric field effect on superconducting YBa2Cu3O7−δ films , 1991 .

[3] C. Doughty,et al. Electric field effect in high Tc superconducting ultrathin YBa2Cu3O7−x films , 1991 .

[4] K. Char,et al. Multichip module using multilayer YBa2Cu3O7−δ interconnects , 1993 .

[5] Qi Li,et al. Dielectric properties of SrTiO3 thin films used in high Tc superconducting field‐effect devices , 1992 .

[6] The surface impedance of superconductors , 1964 .

[7] Kwon,et al. Effects of field-induced hole-density modulation on normal-state and superconducting transport in YBa2Cu3O7-x. , 1992, Physical review letters.