Study on the Field-Dependent Activation Energy, U(H,T), Upper Critical Field, Hc2(0), and Irreversibility Field, µ0Hirr, Properties of Superconducting Single-Crystal Ag-Added Fe(Se, Te) Alloys

Yakinci, K.

doi:10.1007/s10948-022-06328-z

J Supercond Nov Magn

2022

DOI: 10.1007/s10948-022-06328-z

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Study on the Field-Dependent Activation Energy, U(H,T), Upper Critical Field, Hc2(0), and Irreversibility Field, µ0Hirr, Properties of Superconducting Single-Crystal Ag-Added Fe(Se, Te) Alloys

K. Yakinci

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Cited by 6 publications

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Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Miglani,

Chauhan,

Varma

2023

Physica Status Solidi (a)

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A comprehensive study of magnetotransport and field‐dependent specific heat of FeTe0.58Se0.42 single crystals synthesized using the self‐flux method is reported. The transport measurement reveals the presence of Fermi liquid behavior in the normal state resistivity of the single crystals. Furthermore, the grown single crystals exhibit anisotropy and demonstrate a high value of upper critical magnetic field (HC2). The magnetoresistance exhibits a linear behavior as the magnetic field increases, suggesting the possible presence of a Dirac‐cone state. Anisotropy is also observed in magnetoresistance near the superconducting transition temperature (TC). The sign reversal of the Hall coefficient and the violation of Kohler's rules are observed, which provide evidence of the presence of multiband effects in FeTe0.58Se0.42 single crystals. Specific heat measurements confirm the bulk superconductivity in the grown single crystals. Additionally, the specific heat jump is estimated, which is approximately equal to . The magnetic field‐dependent specific heat also suggests multiband superconductivity and offers insights into the upper critical field. Furthermore, the electronic specific heat is best fitted with a two‐band model. Moreover, the field‐dependent residual Sommerfeld coefficient gives information about the superconducting pairing symmetry.

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Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Miglani,

Chauhan,

Varma

2023

Physica Status Solidi (a)

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Vortex Phase Diagram and Pinning Mechanisms of Air‐Annealed FeTe_0.8S_0.2 Single Crystals

Miglani,

Varma

2024

Physica Status Solidi (b)

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The vortex phase diagram and superconducting properties of air‐annealed FeTe0.8S0.2 single crystals are investigated. The annealed samples exhibit a superconducting transition, as confirmed by temperature‐dependent resistivity measurements. The thermally activated energy is calculated from the magnetotransport measurements, and the analysis shows that as the magnetic field increases, there is a crossover from single to collective vortex pinning. The vortex phase diagrams have been determined by analyzing magnetic field‐dependent resistivity, revealing the transitions from an unpinned vortex liquid region to a pinned vortex liquid state and further transition from this pinned state to a vortex glass state. Temperature‐dependent magnetization measurement determines the superconducting volume fraction. The critical current densities, as a function of the magnetic field (JC(H)), have been estimated from the magnetization versus magnetic field loops measured at various temperatures. Bean's critical state model estimates the JC values, and for an optimized annealed crystal, the self‐field JC at 2 K is . The normalized pinning force density in the samples is determined using the Dew Hughes model to identify the pinning mechanisms. The temperature‐dependent JC data analysis indicates the presence of ‐pinning in the samples. Theoretical models analyze experimental observations to understand the vortex pinning mechanisms.

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Effect of sputtering pressure on the superconducting properties of Fe(Te,Se) films

Wang

Ou²,

Zhang³

et al. 2022

J Mater Sci

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Study on the Field-Dependent Activation Energy, U(H,T), Upper Critical Field, Hc2(0), and Irreversibility Field, µ0Hirr, Properties of Superconducting Single-Crystal Ag-Added Fe(Se, Te) Alloys

Cited by 6 publications

References 65 publications

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Vortex Phase Diagram and Pinning Mechanisms of Air‐Annealed FeTe_0.8S_0.2 Single Crystals

Effect of sputtering pressure on the superconducting properties of Fe(Te,Se) films

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About

Study on the Field-Dependent Activation Energy, U(H,T), Upper Critical Field, Hc2(0), and Irreversibility Field, µ0Hirr, Properties of Superconducting Single-Crystal Ag-Added Fe(Se, Te) Alloys

Cited by 6 publications

References 65 publications

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe0.58Se0.42 Single Crystals Grown by Self‐Flux Method

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe0.58Se0.42 Single Crystals Grown by Self‐Flux Method

Vortex Phase Diagram and Pinning Mechanisms of Air‐Annealed FeTe0.8S0.2 Single Crystals

Effect of sputtering pressure on the superconducting properties of Fe(Te,Se) films

Contact Info

Product

Resources

About

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Vortex Phase Diagram and Pinning Mechanisms of Air‐Annealed FeTe_0.8S_0.2 Single Crystals