| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Observation of Two-Level Critical State in the Superconducting FeTe Thin Films$^*$ |
| Hao Ru, Yi-Shi Lin, Yin-Cong Chen, Yang Feng, Yi-Hua Wang** |
Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai200438
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| Cite this article: |
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Hao Ru, Yi-Shi Lin, Yin-Cong Chen et al 2019 Chin. Phys. Lett. 36 077402 |
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Abstract FeTe, a non-superconducting parent compound in the iron-chalcogenide family, becomes superconducting after annealing in oxygen. Under the presence of magnetism, spin-orbit coupling, inhomogeneity and lattice distortion, the nature of its superconductivity is not well understood. Here we combine the mutual inductance technique with magneto transport to study the magnetization and superconductivity of FeTe thin films. It is found that the films with the highest $T_{\rm C}$ show non-saturating superfluid density and a strong magnetic hysteresis distinct from that in a homogeneous superconductor. Such a hysteresis can be well explained by a two-level critical state model and suggests the importance of granularity to superconductivity in this compound.
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Received: 12 June 2019
Published: 22 June 2019
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| PACS: |
74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.25.F-
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(Transport properties)
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74.78.-w
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(Superconducting films and low-dimensional structures)
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74.70.Xa
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(Pnictides and chalcogenides)
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| Fund: $^{*}$Supported by the National Key Research and Development Program of China under Grant Nos 2016YFA0301002 and 2017YFA0303000, and the National Natural Science Foundation of China under Grant No 11827805. |
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