Magnetic scaling in the underdoped superconductor Hg0.8Re0.2Ba2Ca2Cu3O8 studied by 63Cu NMR
Atsushi Goto, Tadashi Shimizu, P. V. P. S. S. Sastry, Justin Schwartz
DOI 10.1103/PhysRevB.59.R14169 · Physical Review B
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Abstract
An approach has been made to deduce the second moment contribution of the planar Cu NMR line from indirect nuclear couplings, using the middle plane sites of the trilayer superconductor, Hg0.8Re0.2Ba2Ca2Cu3O8 (Tc=126 K). We find that T1 fluctuations of neighboring nuclear spins in the plane are the dominant causes of the spin-echo decay observed in the present case of an external field perpendicular to the c axis. Taking account of this effect in the analysis, the second moment is deduced. From the T dependences of the T1 and second moment thus obtained, we find the dynamical exponent, z=2. The present result indicates that the boundary of z crossing from 2 (overdamped regime) to 1 (quantum critical regime) may be shifted more closely to the antiferromagnetic phase than previously assumed. It is also shown that the pseudogap is not a specific feature to the z=1 region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg0.8Re0.2Ba2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 126 | Pressure not reported | unknown |
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