Anomalous Low Temperature Behavior of Superconducting Nd1.85Ce0.15CuO4−y
L. Alff, S. Meyer, S. Kleefisch, U. Schoop, A. Marx, H. Sato, M. Naito, R. Gross
DOI 10.1103/PhysRevLett.83.2644 · Physical Review Letters
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Abstract
We have measured the temperature dependence of the in-plane London penetration depth λab(T) and the maximum Josephson current Ic(T) using bicrystal grain boundary Josephson junctions of the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4−y. In contrast to the usual monotonous decrease (increase) of λab(T) [ Ic(T)] with decreasing temperature, λab(T) and Ic(T) are found to increase and decrease, respectively, with decreasing temperature below 4 K. We attribute this anomalous behavior to the presence of the Nd3+ paramagnetic moments. Correcting the measured λab(T) dependence for the temperature dependent susceptibility due to the Nd moments, an exponential dependence is obtained indicating isotropic s-wave pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
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