Evidence of a Spin Resonance Mode in the Iron-Based Superconductor Ba0.6K0.4Fe2As2 from Scanning Tunneling Spectroscopy
Lei Shan, Jing Gong, Yong-Lei Wang, Bing Shen, Xingyuan Hou, Cong Ren, Chunhong Li, Huan Yang, Hai-Hu Wen, Shiliang Li, Pengcheng Dai
DOI 10.1103/PhysRevLett.108.227002 · Physical Review Letters
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Abstract
We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron pnictide superconductor Ba0.6K0.4Fe2As2 (Tc=38 K). Features of a bosonic excitation (mode) are observed in the measured quasiparticle density of states. The bosonic features are intimately associated with the superconducting order parameter and have a mode energy of ∼14 meV, similar to the spin resonance measured by inelastic neutron scattering. These results indicate a strong electron-spin excitation coupling in iron pnictide superconductors, similar to that in high-Tc copper oxide superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| Pr0.88LaCe0.12CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.67K0.33Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.73K0.27Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.68K0.32Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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