keywords ANTIFERROMAGNETIC-FERMI-LIQUID BI2SR2CACU2O8+DELTA DEPENDENCE GAP ANISOTROPY HIGH-TEMPERATURE SUPERCONDUCTORS Materials Science Materials Science, Multidisciplinary PENETRATION DEPTH Physical Sciences Physics Physics, Applied Physics, Condensed Matter RELAXATION STATE Science & Technology Technology YBA2CU3O6.9 YBA2CU3O7-DELTA