Phase separation to antiferromagnetic and superconducting domains in oxygen-rich single-crystal La2CuO4+x: Magnetic and structural neutron-diffraction studies
D. Vaknin, J. L. Zarestky, D. C. Johnston, J. E. Schirber, Z. Fisk
DOI 10.1103/PhysRevB.49.9057 · Physical Review B
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Abstract
We report on magnetic and structural neutron-diffraction studies of single-crystal La2CuO4+x versus temperature. The low-temperature diffraction data are consistent with the coexistence of two structurally related phases: nearly stoichiometric, antiferromagnetic (AF) domains, with average domain diameter ∼500 Å in the CuO2 plane, and oxygen-rich, metallic, and superconducting domains. The ordered magnetic moment in the AF domains does not saturate at 10 K, and is on average, μ=(0.3±0.05)μB/Cu atom. The phase-separation transition to these two phases occurs at TPS=260±5 K, which is about 15 K higher than the Néel temperature, TN=245±3 K. The value of TPS is identical within the errors with that (259±2 K) found previously from specific-heat measurements on the same crystal. The structural properties of the single crystal are discussed and compared to those of polycrystalline oxygen-rich La2CuO4+x.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | onset |
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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