Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductor GdBa2Cu3O7−δ
R. J. Ormeno, C. E. Gough, Guang Yang
DOI 10.1103/PhysRevB.63.104517 · Physical Review B
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Abstract
The complex surface impedance of a number of GdBa2Cu3O7−δ single crystals has been measured at 10, 15, and 21 GHz using a cavity perturbation technique. At low temperatures a marked increase in the effective penetration depth and surface resistance is observed associated with a frequency dependent paramagnetic and antiferromagnetic alignment of the Gd spins. The effective penetration depth has a sharp change in slope at the Néel temperature, TN∼2.2 K, with a peak in the surface resistance slightly above. The observed temperature and frequency dependence can be described by a model which assumes a negligibly small interaction between the Gd spins and the electrons in the superconducting state, with a frequency dependent magnetic susceptibility and a Gd spin relaxation time τs being a strong function of temperature. Above TN, τs has a component varying as 1/(T−TN), while below TN it increases ∼T−5.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | unknown |
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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