Neutron-diffraction study of antiferromagnetic order in the magnetic superconductor ErNi2B2C
S. K. Sinha, J. W. Lynn, T. E. Grigereit, Z. Hossain, L. C. Gupta, R. Nagarajan, C. Godart
DOI 10.1103/PhysRevB.51.681 · Physical Review B
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Abstract
We have carried out powder-neutron-diffraction studies of the antiferromagnetic order that develops below TN=6.8 K in the magnetic superconductor (Tc=11 K) ErNi2B2C. The antiferromagnetic structure is associated with spins on the Er atoms, which order in a transversely polarized planar sinusoidal structure propagating along the a or b axis in equal domains, with the Er moments parallel to the b or a axis, respectively. Third and fifth harmonics of the sine wave are observed at low temperatures, indicating a squared-up sine wave, with a low-temperature amplitude of 7.8μB/Er atom. There is also evidence of an induced moment of -0.35μB on the Ni ions. A similar study of the isostructural compound YNi2B2C revealed no magnetic peaks (μ<0.13μB) developing down to 0.3 K for Q values less than 1.6 Å−1.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ErNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.6 | Pressure not reported | unknown |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.6 | Pressure not reported | unknown |
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