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

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Single crystal growth, transport and scanning tunneling microscopy and spectroscopy of FeSe1−xSx†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1039/c8ce00074c
Dmitriy Chareev _{1,

2,

3,

4,

5} , Yevgeniy Ovchenkov _{4,

6,

7} , Larisa Shvanskaya _{4,

6,

7,

8,

9} , Andrey Kovalskii _{4,

8,

9} , Mahmoud Abdel-Hafiez _{4,

8,

9,

10,

11} , Dan J. Trainer _{12,

13,

14} , Eric M. Lechner _{12,

13,

14} , Maria Iavarone _{12,

13,

14} , Olga Volkova _{4,

5,

6,

7,

15} , Alexander Vasiliev _{4,

6,

7,

8,

9}

Affiliation

Single crystals of sulfur-substituted iron selenide, FeSe_1−xS_x, 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 FeSe_0.96 at T_C = 8.4 K and T_N = 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 FeSe_1−xS_x 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, T_C follows the conventional dome-shaped curve while T_N decreases with x. The overall appearance of the T–x phase diagram of FeSe_1−xS_x suggests the importance of nematic fluctuations for the formation of the superconducting state in these compounds.

中文翻译：

FeSe _{1- x} S _x †的单晶生长，传输和扫描隧道显微镜和光谱

在永久温度梯度下，在熔融卤化物的低共熔物AlCl ₃ / KCl，AlCl ₃ / KCl / NaCl或AlCl ₃ / KBr中生长了硫取代的硒化亚铁铁的单晶FeSe _{1- x} S _x。结晶容器的创新“的安瓿在安瓿”的设计允许获得毫米大小的板状的单晶用硫含量高达X〜0.19。物理性质的异常异常表明FeSe _0.96在T _C = 8.4 K和T _N时发生了超导和向列相变= 90K。扫描隧道显微镜显示在FeSe _{1- x} S _x系列化合物中，与Fe空位相关的哑铃缺陷和与S相关的硫属元素位点存在深色缺陷。扫描隧道光谱法显示，在低S含量水平下，费米表面的空穴和电子穴处都存在两个不同的超导间隙。作为硫含量的函数，T _C遵循常规的圆顶形曲线，而T _N随x减小。FeSe _1-_x S _x的T – x相图的整体外观这表明向列波动对于这些化合物中超导状态形成的重要性。

更新日期：2018-03-20

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