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Optical conductivity of nodal superconductors
Balazs Dora,Kazumi Maki,Attila Virosztek 한국물리학회 2006 Current Applied Physics Vol.6 No.5
Recently a number of nodal superconductors have been identied. These include highTc cuprate superconductors, the ones inSr2RuO 4, CeCoIn5,j -(ET)2Cu(NCS)2, UPd2Al3, etc. The optical conductivity forE parallel to the conducting plane is the same forthese nodal superconductors. Limiting our study toT= 0 K, we computer1(x ) and xr 2(x ) in the presence of impurities. When theimpurity scattering is in the unitary limit,r1(x ) has a peak forx /D. 0.10.5. This may account for the peak seen by Basov et al.[D.N. Basov, B. Dabrowski, T. Timusk, Phys. Rev. Lett. 81 (1998) 2132] in Zn-substituted YBCO.
Giant Nernst effect in the pseudogap phase of high Tc superconductors
Balazs Dora,Kazumi Maki,Attila Virosztek,Andras Vanyolos 한국물리학회 2004 Current Applied Physics Vol.4 No.6
We have investigated theoretically the Nernst eect in unconventional (d-wave) charge and spin density waves (UDW). In the presence of magnetic eld, Landau levels are formed, and the gapless behaviour of the low energy excitations change into gapped behaviour. When additional electric eld is applied, the quasiparticles drift with a velocity ofE· B/B2, and carry entropy. From this,the Nernst coecient can be calculated using the Kelvin relation. The present results account very nicely for the measured Nernstsignal in the pseudogap phase of highTc superconductor La2. xSrxCuO4 and Bi2Sr2. yLayCuO6. This indicates that the large Nernsteect is a clear signiture of UDW.