Superconductivity and antiferromagnetic ordering in the high-field paramagnetic oxypnictide NdFeAsO0.94F0.06
Chiara Tarantini, Alex Gurevich, David C. Larbalestier, Zhi-An Ren, Xiao-Li Dong, Wei Lu, Zhong-Xian Zhao
DOI 10.1103/PhysRevB.78.184501 · Physical Review B
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Abstract
We present measurements of the temperature and field dependencies of the magnetization M(T,H) of NdFeAsO0.94F0.06 at fields up to 33 T to probe the coexistence of superconductivity with global antiferromagnetic ordering. Although M(T,H) at 48<T<140 K exhibits a clear Curie-Weiss temperature dependence corresponding to the Neel temperature TN≈11–12 K, the behavior of M(T,H) below Tc is only consistent with either paramagnetism of weakly interacting magnetic moments or perhaps a spin-glass state. We show that the anomalous magnetic behavior of the high-field paramagnetic superconductor NdFeAs(O1−xFx) is mostly determined by the magnetic Nd3+ ions, which rules out intrinsic long-range antiferromagnetism on the FeAs plane in the superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdFeAsO0.94F0.06 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49 | Pressure not reported | onset |
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