Specific heat of the iron-based high-Tc superconductor SmO1−xFxFeAs
L. Ding, C. He, J. K. Dong, T. Wu, R. H. Liu, X. H. Chen, S. Y. Li
DOI 10.1103/PhysRevB.77.180510 · Physical Review B
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Abstract
The specific heat C(T) of iron-based high-Tc superconductor SmO1−xFxFeAs (0≤x≤0.2) was systematically studied. For the undoped x=0 sample, a specific heat jump was observed at 130K. This is attributed to the structural or spin-density-wave transition, which also manifests on resistivity as a rapid drop. However, this jump disappears with slight F doping in the x=0.05 sample, although the resistivity drop still exists. The specific heat C∕T shows clear anomaly near Tc for x=0.15 and 0.20 superconducting samples. Such anomaly has been absent in LaO1−xFxFeAs. For the parent compound SmOFeAs, C(T) shows a sharp peak at 4.6K, and with electron doping in the x=0.15 sample, this peak shifts to 3.7K. It is interpreted that such a sharp peak results from the antiferromagnetic ordering of Sm3+ ions in this system, which mimics the electron-doped high-Tc cuprate Sm2−xCexCuO4−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmO1-xFxFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | onset |
| SmO0.80F0.20FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | zero_resistance |
| LaO1-xFxFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| LaO0.9F0.1-δFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| Sm1.85Ce0.15CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.5 | Pressure not reported | unknown |
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