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The effect of ‘Fe’ composition on the electronic structure and anisotropic magnetic properties of Fe x Te 0.60 Se 0.40 single crystals

Physica B: Condensed Matter, ISSN: 0921-4526, Vol: 677, Page: 415697
2024
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This study investigates the effect of varying ‘Fe’ composition on the electronic structure and anisotropic magnetic properties of Fe x Te 0.60 Se 0.40 (x = 0.97, 1.00, 1.03) single crystals grown by the self-flux method. X-ray absorption near-edge structure (XANES) measurements at Fe and Se edges have been employed to examine the electronic structure and orbital hybridization. Zero field cooling (ZFC) magnetization measurements have been used to find superconducting transition temperature (T C ) and volume fraction. The measurements of the critical current densities (J C ), using Bean's critical state model, reveal anisotropy in J C. The highest JC∼1.55×106A/cm2 at 2 K and in self-field has been observed for the sample synthesized with composition FeTe 0.60 Se 0.40. The pinning mechanisms have been explained using collective pinning theory and Dew-Hughes model. This study also compares specific heat capacity for samples of different Fe compositions. The residual Sommerfeld coefficient (γres) and superconducting gap (2Δ0) have been estimated for all samples.

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