Appearance of superconductivity at the vacancy order-disorder boundary in
- Univ. of Virginia, Charlottesville, VA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In this work, the role of phase separation and the effect of Fe-vacancy ordering in the emergence of superconductivity in alkali metal doped iron selenides AxFe2-ySe2 (A = K, Rb, Cs) is explored. High energy x-ray diffraction and Monte Carlo simulation were used to investigate the crystal structure of quenched superconducting (SC) and as-grown nonsuperconducting (NSC) KxFe2-ySe2 single crystals. The coexistence of superlattice structures with the in-plane √2 × √2 K-vacancy ordering and the √5 × √5 Fe-vacancy ordering were observed in both the SC and NSC crystals alongside the I4/mmm Fe-vacancy-free phase. Moreover, in the SC crystals, an Fe-vacancy-disordered phase is additionally proposed to be present. Monte Carlo simulations suggest that it appears at the boundary between the I4/mmm vacancy-free phase and the I4/m vacancy-ordered phases (√5 × √5). Lastly, the vacancy-disordered phase is nonmagnetic and is most likely the host of superconductivity.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC52-06NA25396; FG02-01ER45927
- OSTI ID:
- 1471306
- Alternate ID(s):
- OSTI ID: 1437075; OSTI ID: 1473670
- Report Number(s):
- LA-UR--18-28713
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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