Abstract
The superconducting state typically favors a uniform spatial distribution akin to ferromagnetism.Nevertheless,the pair-density-wave state exhibits sign changes in the pairing order,leading to potential frustrations in phase coherence.We propose a mech-anism to the sextetting order stemming from the frustrations in the phase coherence of a pair-density-wave state,whose spatial modulation manifests a vortex-antivortex honeycomb lattice.The classical ground state configurations are mapped to Baxter's three-coloring model,revealing a macroscopic degeneracy accompanied by extensive entropy.The phase coherence problem intertwines the U(1)phases and the vorticity variables.While the resultant color and phase fluctuations suppress the pair-density-wave order,they maintain the sextetting order above the superconducting transition temperature(Tc).The 1/3-fractional vortex emerges as the fundamental topological defect in the sextetting order.This novel mechanism of frustrated superconductivity provides an alternative explanation for the experimental observed fractional oscillations in CsV3Sb5.
基金项目
National Natural Science Foundation of China(12234016)
National Natural Science Foundation of China(12174317)
New Cornerstone Science Foundation()
National Natural Science Foundation of China(12074031)
National Natural Science Foundation of China(12304180)
维普
万方数据