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| Format: | Preprint |
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2024
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| Online-Zugang: | https://arxiv.org/abs/2401.16980 |
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| author | Chen, C. S. Küspert, J. Biało, I. Mueller, J. Chen, K. W. Zou, M. Y. Mazzone, D. G. Bucher, D. Tanaka, K. Ivashko, O. Zimmermann, M. v. Wang, Qisi Shu, Lei Chang, J. |
| author_facet | Chen, C. S. Küspert, J. Biało, I. Mueller, J. Chen, K. W. Zou, M. Y. Mazzone, D. G. Bucher, D. Tanaka, K. Ivashko, O. Zimmermann, M. v. Wang, Qisi Shu, Lei Chang, J. |
| contents | We present a combined growth and transport study of superconducting single-crystalline NdO$_{0.5}$F$_{0.5}$BiS$_2$. Evidence of two-dimensional superconductivity with significant phase fluctuations of preformed Cooper pairs preceding the superconducting transition is reported. This result is based on three key observations. (1) The resistive superconducting transition temperature $T_c$ (defined by resistivity $ρ\rightarrow 0$) increases with increasing disorder. (2) As $T\rightarrow T_c$, the conductivity diverges significantly faster than what is expected from Gaussian fluctuations in two and three dimensions. (3) Non-Ohmic resistance behavior is observed in the superconducting state. Altogether, our observations are consistent with a temperature regime of phase-fluctuating superconductivity. The crystal structure with magnetic ordering tendencies in the NdO$_{0.5}$F$_{0.5}$ layers and (super)conductivity in the BiS$_2$ layers is likely responsible for the two-dimensional phase fluctuations. As such, NdO$_{0.5}$F$_{0.5}$BiS$_2$ falls into the class of unconventional ``laminar" bulk superconductors that include cuprate materials and 4Hb-TaS$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_16980 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO$_{0.5}$F$_{0.5}$BiS$_2$ Chen, C. S. Küspert, J. Biało, I. Mueller, J. Chen, K. W. Zou, M. Y. Mazzone, D. G. Bucher, D. Tanaka, K. Ivashko, O. Zimmermann, M. v. Wang, Qisi Shu, Lei Chang, J. Superconductivity We present a combined growth and transport study of superconducting single-crystalline NdO$_{0.5}$F$_{0.5}$BiS$_2$. Evidence of two-dimensional superconductivity with significant phase fluctuations of preformed Cooper pairs preceding the superconducting transition is reported. This result is based on three key observations. (1) The resistive superconducting transition temperature $T_c$ (defined by resistivity $ρ\rightarrow 0$) increases with increasing disorder. (2) As $T\rightarrow T_c$, the conductivity diverges significantly faster than what is expected from Gaussian fluctuations in two and three dimensions. (3) Non-Ohmic resistance behavior is observed in the superconducting state. Altogether, our observations are consistent with a temperature regime of phase-fluctuating superconductivity. The crystal structure with magnetic ordering tendencies in the NdO$_{0.5}$F$_{0.5}$ layers and (super)conductivity in the BiS$_2$ layers is likely responsible for the two-dimensional phase fluctuations. As such, NdO$_{0.5}$F$_{0.5}$BiS$_2$ falls into the class of unconventional ``laminar" bulk superconductors that include cuprate materials and 4Hb-TaS$_2$. |
| title | Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO$_{0.5}$F$_{0.5}$BiS$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.16980 |