Cu63 NMR probe of superconducting properties in HgBa2Ca2Cu3O8+δ: A possible reason for Tc=133 K
K. Magishi, Y. Kitaoka, G.-q. Zheng, K. Asayama, K. Tokiwa, A. Iyo, H. Ihara
DOI 10.1103/PhysRevB.53.R8906 · Physical Review B
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Abstract
Superconducting properties in HgBa2Ca2Cu3O8+δ, with a transition temperature of Tc=133 K, have been investigated by measurements of the nuclear spin-lattice relaxation rate, (1T1)63. It has been found that the T1T=const behavior, observed well below Tc, arises from combined relaxation channels to vortex cores, as well as from a residual density of states (DOS), Nres, at the Fermi level associated with the gapless superconductivity. From the value of T1T=const in the latter channel, the DOS fraction normalized by its value at Tc, NresNTc, has been deduced to be as small as ∼0.05. Based on the two-dimensional gapless d-wave model, the Tc reduction rate, ΔTcTc0, is estimated to be as small as 0.02 for NresN0∼0.05. It is pointed out that these measures of the quality of HgBa2Ca2Cu3O8+δ explain why Tc reaches such a high value.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 150 | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | unknown |
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