Magnetic-field effects on the density of states of orthorhombic superconductors

Article

关键词: D-WAVE SUPERCONDUCTORS;    PENETRATION-DEPTH ANISOTROPY;    MICROWAVE SURFACE IMPEDANCE;    UNCONVENTIONAL SUPERCONDUCTORS;    IMPURITY SCATTERING;    SINGLE-CRYSTAL;    VORTEX STATE;    OF-STATES;    HEAT;    YBA2CU3O7-DELTA;   

DOI  :  10.1103/PhysRevB.60.12400

来源: SCIE

【 摘 要 】

The quasiparticle density of states in a two-dimensional d-wave superconductor depends on the orientation of the in-plane external magnetic field H. This is because, in the region of the gap nodes, the Doppler shift due to the circulating supercurrents around a vortex core depends on the direction of H. For a tetragonal system the induced pattern is fourfold symmetric and, at zero energy, the density of states exhibits minima along the node directions. But YBa2C3O6.95 is orthorhombic because of the chains and the pattern becomes twofold symmetric with the position of the minima occurring when H is oriented along the Fermi velocity at a node on the Fermi surface. The effect of impurity scattering id Born's and unitary limits is discussed. [S0163-1829(99)03941-7].

【 授权许可】

Free