Probing the superconducting ground state near the charge density wave phase transition in Cu0.06TiSe2
A. D. Hillier, P. Manuel, D. T. Adroja, J. W. Taylor, A. K. Azad, J. T. S. Irvine
DOI 10.1103/PhysRevB.81.092507 · Physical Review B
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Abstract
We have investigated the nature of the superconducting ground state of Cu0.06TiSe2 using muon spin rotation and muon spin relaxation measurements. The temperature dependence of the magnetic penetration depth of Cu0.06TiSe2 is consistent with a single gap s-wave BCS superconductor in the clean limit. The gap energy is Δ(0)=0.27(1) meV, which corresponds to a gap to TC ratio of [2Δ(0)/kBTC]=2.5. The estimated magnetic penetration depth, λ, and the coherence length, ξ, are 660(10) and 15(5) nm, respectively. Furthermore, we observe an irreversibility line in the temperature dependence of the superconducting part of the muon relaxation rate, σsc(T), indicating the presence of strong pinning in Cu0.06TiSe2. Interestingly, at low temperatures we have found clear evidence of the presence of low-energy spin fluctuations that coexist with superconductivity and have an Arrhenius temperature dependence.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cu0.06TiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
| Cu0.06TiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
| CuxTiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.15 | Pressure not reported | unknown |
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