2015/02/28 by Kazuhiro Kuboki
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Bilayer #Condensed matter physics #Cuprate #Field (mathematics) #Flux (metallurgy) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic flux #Materials science #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #Surface (topology) #Symmetry (geometry) #T-symmetry #cond-mat.supr-con #t-J model
paper · pdf · doi:10.7566/jpsj.84.064706
published as J. Phys. Soc. Jpn. 84, 064706 (2015) · 11 pages, 7 figures
arxiv created 2015/05/13 · openalex publication_date 2015/05/13 · arxiv updated 2015/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study surface states of high-TC cuprate superconductor YBCO using the bilayer t-J model. Calculations based on the Bogoliubov de Gennes method show that a flux phase that breaks time-reversal symmetry (\cal T) may arise near a (110) surface where the dx2-y2-wave superconductivity is strongly suppressed. It is found that the flux phase in which spontaneous magnetic fields in two layers have opposite directions may be stabilized in a wide region of doping rate, and split peaks in the local density of states appear. Near the surface, spontaneous magnetic field may not be observed experimentally, because the contributions from two layers essentially cancel out. This may explain the absence of local magnetic filed near the (110) surface of YBCO, for which the sign of \cal T violation has been detected.