Impurity Effects on the Superconducting State With a Nodeless Gap in the t-J Model

摘要

The local dnesity of states around a nonmagnetic impurity is studied in a superconducting state with a nodeless gap [M. Ogata, J. Phys. Soc. Jpn, 66 (1997) 3375] in the two-dimensional t-J model. We find that two resonance peaks in the energy gap are locally induced near the impurity.