Vortex-lattice melting in superconducting fullerene Rb3C60
M. F. Tai, G. F. Chang, M. W. Lee
DOI 10.1103/PhysRevB.52.1176 · Physical Review B
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Abstract
The temperature and field dependences of the dc magnetization have been characterized on a sample of Rb3C60 fullerene with Tc=30.5 K. The sample exhibits a rather large critical current density of about 2×106 A/cm2 at T=5 K and H=0 T. An irreversibility line Hirr(T) is defined by merging points of two sets of zero-field-cooling and field-cooling magnetization curves. The temperature dependence of the irreversibility field is in fairly good agreement with a power-law relation: Hirr(T)=Hirr(0)[1 -T(H)/T0]γ. The best fit of experimental data to this equation provides the following values: γ=2.04±0.16, Hirr(0)=470±52 kOe, and T0=30.4±0.2 K. According to the nonlocal elasticity theory based on the Lindemann criterion, γ=2 strongly suggests the occurrence of thermally activated vortex-lattice melting in our Rb3C60 sample. The Lindemann number of c≤0.074 is comparable to those of conventional type-II superconductors, but is much smaller than those for high-Tc oxides. Our data provide evidence of vortex-lattice melting in the superconducting fullerenes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | unknown |
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