Evidence of unconventional vortex states in the Chevrel phase superconductor PbMo6Se8
Souvik Banerjee, Sudip Ghosh, Anshu Kataria, A. Sundaresan
DOI 10.1103/PhysRevB.110.014512 · Physical Review B
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Abstract
We present a comprehensive investigation of superconducting properties in the Chevrel phase compound PbMo6Se8 by x-ray diffraction, dc magnetization, resistivity, heat capacity, and magnetic relaxation experiments. We determine a bulk superconducting transition temperature Tc of 3.8 K. Key superconducting parameters such as lower [μ0Hc1(0)] and upper [μ0Hc2(0)] critical fields, coherence length [ξGL(0)], penetration depth [λGL(0)], Ginzburg-Landau parameter (κ), Pauli paramagnetic field (μ0HPstr), and Maki parameter (αM) are obtained. The BCS model provides a reasonable description of the heat-capacity data. An unconventional vortex state is evident from the investigation of the unusual fishtail effect and nonmonotonous magnetic field dependency of the vortex pinning energy obtained from the magnetic relaxation experiments, indicating a deviation from the ideal type II superconducting vortex, in PbMo6Se8. A detailed μ0H-T phase diagram has been drawn illustrating a multiphase vortex crossover.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbMo6Se8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| PbMo6Se8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | onset |
| PbMo6Se8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.11 | Pressure not reported | midpoint |
| PbMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SnMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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