2024/11/07 by Pietro Bonfà, Bonfà, Pietro, F. L. Pratt +19 · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2411.04848
openalex publication_date 2024/11/07 · openalex created_date 2024/11/16 · openalex updated_date 2026/08/01
Kagome superconductors AV3Sb5 provide a unique platform for studying the interplay between a variety of electronic orders, including superconductivity, charge density waves, nematic phases and more. Understanding the evolution of the electronic state from the charge density wave to the superconducting transition is essential for unraveling the interplay of charge, spin, and lattice degrees of freedom giving rise to the unusual magnetic properties of these nonmagnetic metals. Previous zero-field and high-field μSR studies revealed two anomalies in the muon spin relaxation rate, a first change at TCDW ∼ 100 K and a second steep increase at T*∼ 40 K, further enhanced by an applied magnetic field, thus suggesting a contribution of magnetic origin. In this study, we use the avoided level crossing μSR technique to investigate charge order in near-zero applied field. By tracking the temperature dependence of quadrupolar level-crossing resonances, we examined the evolution of the electric field gradient at V nuclei in the kagome plane. Our results show a significant rearrangement of the charge density starting at T* indicating a transition in the charge distribution, likely electronic in origin, well below TCDW. These findings, combined with previous μSR, STM, and NMR studies, emphasize the intertwined nature of proximate phases in these systems, with the charge rearrangement dominating the additional increase in μSR relaxation rate below T*.