Inverse Iron Isotope Effect on the Transition Temperature of the (Ba,K)Fe2As2 Superconductor
Parasharam M. Shirage, Kunihiro Kihou, Kiichi Miyazawa, Chul-Ho Lee, Hijiri Kito, Hiroshi Eisaki, Takashi Yanagisawa, Yasumoto Tanaka, Akira Iyo
DOI 10.1103/PhysRevLett.103.257003 · Physical Review Letters
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Abstract
We report that the (Ba,K)Fe2As2 superconductor (transition temperature, Tc∼38 K) has an inverse iron isotope coefficient αFe=−0.18(3) (where Tc∼M−αFe and M is the iron isotope mass); i.e., the sample containing the large iron isotope mass depicts a higher Tc. Systematic inverse shifts in Tc were clearly observed between the samples using three types of Fe isotopes (Fe54, natural Fe, and Fe57). This indicates the first evidence of the inverse isotope effect in high-Tc superconductors. This anomalous mass dependence on Tc implies an exotic coupling mechanism in Fe-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| (Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| (Ba,K)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
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