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Issue 17, 2018
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Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1−xSx

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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 Tx phase diagram of FeSe1−xSx suggests the importance of nematic fluctuations for the formation of the superconducting state in these compounds.

Graphical abstract: Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1−xSx

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Article information


Submitted
16 Jan 2018
Accepted
20 Mar 2018
First published
20 Mar 2018

CrystEngComm, 2018,20, 2449-2454
Article type
Paper
Author version available

Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1−xSx

D. Chareev, Y. Ovchenkov, L. Shvanskaya, A. Kovalskii, M. Abdel-Hafiez, D. J. Trainer, E. M. Lechner, M. Iavarone, O. Volkova and A. Vasiliev, CrystEngComm, 2018, 20, 2449
DOI: 10.1039/C8CE00074C

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