Low-frequency spin dynamics as probed by 63Cu and 199Hg NMR in HgBa2CuO4+δ superconductors with different oxygen content
A. A. Gippius, E. V. Antipov, W. Hoffmann, K. Lüders, G. Buntkowsky
DOI 10.1103/PhysRevB.59.654 · Physical Review B
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Abstract
63Cu and 199Hg nuclear magnetic resonance was performed on a series of powder HgBa2CuO4+δ samples with different oxygen content δ in order to study the influence of oxygen doping on the spin dynamics in the normal and superconducting state. The spin-lattice relaxation time T1 of 199Hg and 63Cu nuclei were measured over a wide range of temperature at different orientations of the crystallites with respect to the magnetic field. For the optimally doped sample (Tc=96 K) we compared our experimental results to numerical calculations of the spin-lattice relaxation rate as a function of temperature below Tc for several types of the order parameter symmetry: isotropic s wave, anisotropic s wave without nodes, s wave with nodes, and d wave, using the different values of the gap parameter 2Δ/kBTc within the AF fluctuation model. The comparison with our experimental relaxation data shows that for 199Hg nuclei in the orientation B0∥(a,b) plane as well as for 63Cu nuclei in both orientations, B0∥(a,b) plane and B0∥c axis, the experimental results are in coincidence with the dx2−y2-wave symmetry with the gap parameter 2Δ/kBTc=7.02.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 72 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
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