Superconducting fluctuations in the reversible magnetization of the iron-pnictide Ba1−xKxFe2As2
S. Salem-Sugui, Jr., L. Ghivelder, A. D. Alvarenga, J. L. Pimentel, Jr., Huiqian Luo, Zhaosheng Wang, Hai-Hu Wen
DOI 10.1103/PhysRevB.80.014518 · Physical Review B
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Abstract
We report on isofield magnetization curves obtained as a function of temperature in two single crystals of Ba1−xKxFe2As2 with superconducting transition temperature Tc=28 and 32.7 K. Results obtained for fields above 20 kOe show a well-defined rounding effect on the reversible region extending 1–3 K above Tc(H) masking the transition. This rounding appears to be due to three-dimensional critical fluctuations, as the higher field curves obey a well known scaling law for this type of critical fluctuations. We also analyzed the asymptotic behavior of M vs T curves in the reversible region which probes the shape of the gap near Tc(H). Results of the analysis suggests that phase fluctuations are important in Ba1−xKxFe2As2 which is consistent with nodes in the gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.7 | Pressure not reported | unknown |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
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