Quantum dynamics of hydrogen in the iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
Jun-ichi Yamaura, Haruhiro Hiraka, Soshi Iimura, Yoshinori Muraba, Joonho Bang, Kazuhiko Ikeuchi, Mitsutaka Nakamura, Yasuhiro Inamura, Takashi Honda, Masatoshi Hiraishi, Kenji M. Kojima, Ryosuke Kadono, Yoshio Kuramoto, Youichi Murakami, Satoru Matsuishi, Hideo Hosono
DOI 10.1103/PhysRevB.99.220505 · Physical Review B
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Abstract
Inelastic neutron scattering was performed for an iron-based superconductor LaFeAsO0.9D0.1, where most of D (deuterium) replaces oxygen, while a tiny amount goes into the interstitial sites. By first-principles calculation, we characterize the interstitial sites for D (and for H slightly mixed) with four equivalent potential minima. Below the superconducting transition temperature Tc=26K, excitations emerge in the range 5–15 meV, while they are absent in the reference system LaFeAsO0.9F0.1. The strong excitations at 14.5 and 11.1 meV broaden rapidly around 15 and 20 K, respectively, where each energy becomes comparable to twice the superconducting gap. The strong excitations are ascribed to a quantum rattling, or a band motion of hydrogen, which arises only if the number of potential minima is larger than two.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO0.9D0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| SmFeAsO0.85F0.15 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
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