Mixed temperature-dependent order parameters in the extended Hubbard model.

J Phys Condens Matter

Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.

Published: February 2021

The extended Hubbard model can host s-wave, d-wave and p-wave superconducting phases depending on the values of the on-site and nearest-neighbour interactions. Upon detailed examination of the free energy functional of the gap in this model, we show that these symmetries are often dependent on temperature. The critical points of this functional are constrained by symmetry and allow us to formulate stringent conditions on the temperature profile of the gap function, applicable to other models as well. We discuss the finite temperature phase diagram of the extended Hubbard model, and point out the existence of symmetry transitions below T . Understanding the nature of these transitions is crucial to assessing the symmetry of unconventional superconductors.

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Source
http://dx.doi.org/10.1088/1361-648X/abc801DOI Listing

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