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|Title:||Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1-xSx|
Trainer, D. J.
Lechner, E. M.
|Publisher:||Royal Society of Chemistry|
|Citation:||Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1-xSx / D. Chareev, Y. Ovchenkov, L. Shvanskaya, et al. — DOI 10.1039/c8ce00074c // CrystEngComm. — 2018. — Vol. 20. — Iss. 17. — P. 2449-2454.|
|Abstract:||Single crystals of sulfur-substituted iron selenide, FeSe1-xSx, were grown within eutectics of molten halides, AlCl3/KCl, AlCl3/KCl/NaCl or AlCl3/KBr, under permanent temperature gradient. The innovative "ampoule in ampoule" design of a crystallization vessel allows obtaining mm-sized plate-like single crystals with a sulfur content up to x ∼ 0.19. The sharp anomalies in the physical properties indicate the superconducting and nematic phase transitions in FeSe0.96 at TC = 8.4 K and TN = 90 K, respectively. Scanning tunneling microscopy reveals the presence of dumbbell defects associated with Fe vacancies and dark defects at the chalcogen site associated with S within the FeSe1-xSx series of compounds. Scanning tunneling spectroscopy shows the presence of two different superconducting gaps at both hole and electron pockets of the Fermi surface for low S content levels. As a function of sulfur content, TC follows the conventional dome-shaped curve while TN decreases with x. The overall appearance of the T-x phase diagram of FeSe1-xSx suggests the importance of nematic fluctuations for the formation of the superconducting state in these compounds. © 2018 The Royal Society of Chemistry.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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