Deposition of iron selenide nanocrystals and thin films from tris(N,N-diethyl-N′-naphthoylselenoureato)iron(iii)

Cadmium iron selenide (Cd-Fe-Se) thin films were deposited onto tin oxide (SnO2) coated conducting glass substrates from an aqueous electrolytic bath containing CdSO4, FeSO4 and SeO2 by potentiostatic electrodeposition. The deposition potentials of Cadmium (Cd), Iron (Fe), Selenium (Se) and Cadmium-Iron-Selenide (Cd-Fe-Se) were determined from linear cathodic polarization curves. The deposited films were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis by x-rays (EDX) and optical absorption techniques, respectively. X-ray diffraction patterns shows that the deposited films are found to be hexagonal structure with preferential orientation along (100) plane. The effect of FeSO4 concentration on structural, morphological, compositional and optical properties of the films are studied and discussed in detail.

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Size-dependent structural, electrical and optical properties of nanostructured iron selenide thin films deposited by Chemical Bath Deposition Method

Solid State Sciences ◽

10.1016/j.solidstatesciences.2012.10.021 ◽

2013 ◽

Vol 16 ◽

pp. 134-142 ◽

Cited By ~ 20

Author(s):

Ashok U. Ubale ◽

Yogesh S. Sakhare ◽

Monali V. Bhute ◽

Milind R. Belkhedkar ◽

Arvind Singh

Keyword(s):

Thin Films ◽

Optical Properties ◽

Chemical Bath Deposition ◽

Chemical Bath Deposition Method ◽

Deposition Method ◽

Electrical And Optical Properties ◽

Iron Selenide ◽

Size Dependent

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Nanoscale decoupling of electronic nematicity and structural anisotropy in FeSe thin films

Nature Communications ◽

10.1038/s41467-020-20150-y ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Zheng Ren ◽

Hong Li ◽

He Zhao ◽

Shrinkhala Sharma ◽

Ziqiang Wang ◽

...

Keyword(s):

Thin Films ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

Structural Anisotropy ◽

Iron Selenide ◽

Nematic Order ◽

Anisotropic Strain ◽

Nematic State ◽

Spatially Varying ◽

Electronic Nematicity

AbstractIn a material prone to a nematic instability, anisotropic strain in principle provides a preferred symmetry-breaking direction for the electronic nematic state to follow. This is consistent with experimental observations, where electronic nematicity and structural anisotropy typically appear hand-in-hand. In this work, we discover that electronic nematicity can be locally decoupled from the underlying structural anisotropy in strain-engineered iron-selenide (FeSe) thin films. We use heteroepitaxial molecular beam epitaxy to grow FeSe with a nanoscale network of modulations that give rise to spatially varying strain. We map local anisotropic strain by analyzing scanning tunneling microscopy topographs, and visualize electronic nematic domains from concomitant spectroscopic maps. While the domains form so that the energy of nemato-elastic coupling is minimized, we observe distinct regions where electronic nematic ordering fails to flip direction, even though the underlying structural anisotropy is locally reversed. The findings point towards a nanometer-scale stiffness of the nematic order parameter.

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