Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
| Autor: | Yamaura, Jun-ichi, Hiraka, Haruhiro, Iimura, Soshi, Muraba, Yoshinori, Bang, Joonho, Ikeuchi, Kazuhiko, Nakamura, Mitsutaka, Inamura, Yasuhiro, Honda, Takashi, Hiraishi, Masatoshi, Kojima, Kenji M., Kadono, Ryosuke, Kuramoto, Yoshio, Murakami, Youichi, Matsuishi, Satoru, Hosono, Hideo |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 99, 220505(R) (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.99.220505 |
| Popis: | 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 interstitial sites. By first-principle calculation, we characterize the interstitial sites for D (and for H slightly mixed) with four equivalent potential minima. Below the superconducting transition temperature Tc = 26 K,new 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 meV and 11.1 meV broaden rapidly around 15 K and 20 K, respectively, where each energy becomes comparable to twice of 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. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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