2003/09/30 by Joel E. Moore, Dung-Hai Lee, D.-H. Lee · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat #hep-th
paper · pdf · doi:10.1103/physrevb.69.104511
published as Phys.Rev. B69 (2004) 104511 · 8 pages
arxiv created 2003/10/03 · openalex publication_date 2004/03/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Superconducting order parameters that change phase around the Fermi surface modify Josephson tunneling behavior, as in the phase-sensitive measurements that confirmed d order in the cuprates. This paper studies Josephson coupling when the individual grains break time-reversal symmetry; the specific cases considered are p\ifmmode±\else\textpm\fiip and d\ifmmode±\else\textpm\fiid, which may appear in Sr2RuO4 and NaxCoO2\ensuremath⋅(H2O)y, respectively. T-breaking order parameters lead to frustrating phases when not all grains have the same sign of time-reversal symmetry breaking, and the effects of these frustrating phases depend sensitively on geometry for two-dimensional arrays of coupled grains. These systems can show perfect superconducting order with or without macroscopic T-breaking. The honeycomb lattice of superconducting grains has a superconducting phase with no spontaneous breaking of T but instead power-law correlations. The superconducting transition in this case is driven by binding of fractional vortices, and the zero-temperature criticality realizes a generalization of Baxter's three-color model.