Impurity effects on d x 2-y 2-wave superconducting state in strongly correlated Hubbard model

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With cuprate superconductors in mind, we study the effects of point-type impurity potential (V) on a d x 2-y 2-wave superconducting (d-SC) state in a strongly correlated squarelattice Hubbard model (U/t = 12) with a diagonal transfer (t′), using a variational Monte Carlo method. At half filling, insulator-to-conductor (filling-control-type Mott) transitions occur at V=V U∼ . The phase realized for V< V U(-) is robust d-SC and the charge carriers are holes, whereas for V> V U(+) a metallic (or weak d-SC) state appears with charge carriers of electrons. For a partially-filled case where the impurity density is equal to the doping rate, a d-SC-to-insulator transition arises at V ≡ V M ∼ 4t. In the weak-|V| phases, the impurity effects in the electron distribution are smeared out by the screening effect, whereas in the strong-|V| phases, the electron distribution directly depend on the impurity configurations.

Original languageEnglish
Article number012029
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2019 Oct 15
Event31st International Symposium on Superconductivity, ISS 2018 - Tsukuba, Ibaraki, Japan
Duration: 2018 Dec 122018 Dec 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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