Magnetic-Field-Induced Re-entrance of Superconductivity in Ta<sub>2</sub>PdS<sub>5</sub> Nanostrips

Zhang, Enze; Xu, Xiaoguang; Huang, Ce; Zou, Yichao; Ai, Linfeng; Liu, Shanshan; Leng, Pengliang; Jia, Zehao; Zhang, Yuda; Zhao, Minhao; Yang, Yunkun; Liu, Jinyu; Haigh, Sarah J.; Mao, Zhiqiang; Xiu, Faxian

doi:10.1021/acs.nanolett.0c03655

Cited by 5 publications

(2 citation statements)

References 42 publications

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“…3(a), the reentrant superconductivity phenomenon occurs, i.e., non-zero resistances below T c0 appear again at low temperatures, which has been reported in a large variety of superconductors. [44][45][46][47][48][49][50]55] We have found that the reentrant superconductivity can be obtained in the curved sample at small θ and low currents or at large θ and high currents, as shown in Figs. 3(a) and 6(a).…”

Section: The ρ(T) At High Currentsmentioning

confidence: 71%

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Zhang

et al. 2023

Chinese Phys. B

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High quality Nb films were successfully prepared on both flexible polyimide (PI) and rigid Al2O3 substrates and their transport properties were systematically studied at various applied currents, external magnetic fields, and sample orientations. It is found that a curved Nb/PI film exhibits quite different superconducting transition and vortex dynamics compared to the flat Nb/Al2O3 film. For the curved Nb/PI film, smooth superconducting transitions were obtained at low currents, while unexpected cascade structures are revealed in the ρ(T) curves at high currents. We attribute this phenomenon to the gradient distribution of vortex density together with a variation of superconductivity along the curved film. In addition, reentrant superconductivity was induced in the curved Nb/PI thin film by properly choosing the measurement conditions. We attribute this effect to the vortex pinning from both in-plane vortices and out-of-plane vortices. This work reveals the complex transport properties of curved superconducting thin films, providing important insights for further theoretical investigations and practical developments of flexible superconductors.

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Section: The ρ(T) At High Currentsmentioning

confidence: 71%

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Zhang

et al. 2023

Chinese Phys. B

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“…As the sample appears to be granular in nature (Fig. S8 ), SFs might be the most plausible mechanism responsible for the observed reentrant states and the associated negative MR 37 , 46 , 47 . In this scenario, the Cooper pairs are localized in individual grains and the conduction is mainly led by the single particle conduction channel.…”

Section: Discussionmentioning

confidence: 99%

Granularity mediated multiple reentrances with negative magnetoresistance in disordered TiN thin films

Yadav,

Aloysius,

Gupta

et al. 2023

Sci Rep

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Granular superconductors are the common examples of experimentally accessible model systems which can be used to explore various fascinating quantum phenomena that are fundamentally important and technologically relevant. One such phenomenon is the occurrence of reentrant resistive states in granular superconductors. Here, we report the observation of multiple reentrant resistive states for a disordered TiN thin film in its temperature and magnetic field dependent resistance measurements, R(T) and R(B), respectively. At each of the peak-temperatures corresponding to the zero-field R(T), a resistance peak appears in the R(B) around zero field which leads to a negative magnetoresistance (MR) region in its surrounding. These low-field negative MR regions appear for both perpendicular and parallel field directions with relatively higher amplitude and larger width for the parallel field. By adopting a granularity-based model, we show that the superconducting fluctuations in granular superconductors may lead to the observed reentrant states and the corresponding negative MR. Here, we propose that the reduction in the density of states in the fermionic channel due to the formation of Cooper pairs leads to the reentrant resistive state and the competition between the conduction processes in the single particle and Cooper channels result into the multiple resistive reentrances.

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Thermal gradient-induced critical current degradation in mesoscopic superconducting thin film

Xie,

Zhang,

Zhang

2024

Supercond. Sci. Technol.

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Superconducting materials inevitably suffer from the sudden change of temperature in the localized areas in practical applications, the concomitant thermal gradient might be detrimental to the performance. Critical current density is a key factor affecting the performance of superconductors, however, the effect of thermal gradient on the critical current density has not been identified. Here, combining the time-dependent Ginzburg-Landau (TDGL) equations and the heat transfer equation, the thermal gradient and magnetic field dependence of critical current density are systematically investigated and rationalized by exploring the behavior of vortex and magnetization. For lower magnetic fields, it is found that the thermal gradients strongly reduce the local surface barriers which inhibit vortex entry and movement, leading to a rapid deterioration of the current-carrying capability. Under moderate magnetic fields, the critical current density corresponding to higher thermal gradients decreases more slowly with increasing magnetic field, which results from the thermal gradient-induced entry and moving of vortices along the current direction. As the magnetic field continues to increase, the variation of critical current density transitions into a platform period and even slightly rises. The enhanced critical current is primarily attributed to the excess entry of vortices, which increases the surface barrier of the sample. With the further increase of the magnetic field, the critical current density continues to decrease due to increased magnetic field penetration. These results unveil the fundamental interplay among the thermal gradients, external magnetic field, vortex, magnetization, and critical current density, and provide a theoretical basis for understanding the heat-induced quench of the mesoscopic superconducting thin film in practical applications.

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Magnetic-Field-Induced Re-entrance of Superconductivity in Ta₂PdS₅ Nanostrips

Cited by 5 publications

References 42 publications

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Granularity mediated multiple reentrances with negative magnetoresistance in disordered TiN thin films

Thermal gradient-induced critical current degradation in mesoscopic superconducting thin film

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Magnetic-Field-Induced Re-entrance of Superconductivity in Ta2PdS5 Nanostrips

Cited by 5 publications

References 42 publications

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Granularity mediated multiple reentrances with negative magnetoresistance in disordered TiN thin films

Thermal gradient-induced critical current degradation in mesoscopic superconducting thin film

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Magnetic-Field-Induced Re-entrance of Superconductivity in Ta₂PdS₅ Nanostrips