Pseudogap of the high-temperature superconductor La1.96-xSrxHo0.04CuO4 as observed by neutron crystal-field spectroscopy

Article

关键词: ISOTOPE DEPENDENCE;    DOPING DEPENDENCE;    GAP ANISOTROPY;    SPIN GAP;    PRESSURE;    CHARGE;    STATE;    TRANSITION;    PHASE;    MODEL;   

DOI  :  10.1103/PhysRevB.74.184520

来源: SCIE

【 摘 要 】

We studied the isotope, pressure, and doping effects on the pseudogap temperature T-* by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La1.96-xSrxHo0.04CuO4 (x=0.11,0.15,0.20,0.25). We found clear evidence for the opening of a pseudogap at T-*>T-c in the whole doping range. Furthermore, the effect of oxygen isotope substitution was found to produce an upward shift of T-*, whereas the application of pressure on the optimally doped compound (x=0.15) results in a downward shift of T-*. The opposite effect of oxygen isotope substitution and pressure application indicates that electron-phonon induced effects contribute to the pseudogap formation. The temperature dependence of the relaxation data is consistent with a gap function of predominantly d-wave symmetry.

【 授权许可】

Free