Anomalous Field-Temperature Phase Diagram of Superconductivity in Sn-Pb Solder
arXiv:2309.10407 · doi:10.1063/5.0183526
Abstract
Sn-Pb solders are superconducting materials whose Sn and Pb are perfectly phase-separated. Recently, anomalous magnetic-flux trapping in a Sn45-Pb55 solder has been revealed where the magnetic fluxes are selectively trapped in the Sn regions due to the supercurrents in the surrounding Pb regions. Here, we report on the observation of the anomalous critical field (Hc)-temperature (T) phase diagram of superconductivity in the Sn45-Pb55 solder. Although the Hc(T) for the Pb regions decreases with increasing field as in normal type-I superconductors and is consistent with the conventional trend with Hc(0) ~ 800 Oe, the Hc(T) for the Sn regions exhibits anomalous behaviors. The most noticeable trend was observed in the field-cooled (under 1500 Oe) solder. The Hc-T phase diagram for the Sn regions largely varies when the applied external field is reversed, and Tc increases with increasing field amplitude when H < 0 Oe is applied. On the basis of the flux trapping and the observed anomalous Hc-T phase diagrams, we propose that the field-robust superconductivity in the Sn regions is related to the ferromagnetically-aligned magnetic fluxes (or formation of vortices) in the Sn regions of the Sn45-Pb55 solder.
arXiv comment12 pages, 4 figures
References in corpus (16)
- Proximity effects in superconductor-ferromagnet heterostructures
- Long-range effects in superconductor-ferromagnet structures
- Heavy Fermions and Quantum Phase Transitions
- High Temperature Superconductivity in Iron Pnictides and Chalcogenides
- Ferromagnet-Superconductor Hybrids
- Unconventional Superconductivity in UTe2
- Extremely Large and Anisotropic Upper Critical Field and the Ferromagnetic Instability in UCoGe
- Tricritical point and wing structure in the itinerant ferromagnet UGe2
- Ferromagnetic Quantum Critical Endpoint in UCoAl
- Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds
- Evolution toward Quantum Critical End Point in UGe_2
- Topological Hysteresis in the Intermediate State of Type-I Superconductors
- Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe
- Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
- Exploring Topological Superconductivity in Topological Materials
- Identification of multiple-flux-quanta vortices by core states in the two-band superconductor Pb