تقرير
Pauli-limit violation in lanthanide infinite-layer nickelate superconductors
| العنوان: | Pauli-limit violation in lanthanide infinite-layer nickelate superconductors |
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| المؤلفون: | Chow, L. E., Yip, K. Y., Pierre, M., Zeng, S. W., Zhang, Z. T., Heil, T., Deuschle, J., Nandi, P., Sudheesh, S. K., Lim, Z. S., Luo, Z. Y., Nardone, M., Zitouni, A., van Aken, P. A., Goiran, M., Goh, S. K., Escoffier, W., Ariando, A. |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Superconductivity can be destroyed by a magnetic field with an upper bound known as the Pauli-limit in spin-singlet superconductors. Almost all the discovered superconductors are spin-singlet, with the highest transition temperature $T_c$ at ambient pressure achieved in the cuprate family. The closest cuprate analogue is the recently discovered infinite-layer nickelate, which hosts substantial structural and electronic similarity to the cuprate. A previous magnetotransport study on Nd$_{0.775}$Sr$_{0.225}$NiO$_2$ has observed an isotropic Pauli-limited upper critical field. Here, we report a large violation (>2 times) of Pauli-limit in every crystallographic directions in La$_{1-x}$(Ca/Sr)$_x$NiO$_2$ regardless of the doping $x$. Such a large violation of the Pauli-limit in all directions in La$_{1-x}$(Ca/Sr)$_x$NiO$_2$ is unexpected and unlikely accounted by a Fulde Ferrell-Larkin-Ovchinnikov (FFLO)-state, strong spin-orbit-coupling, strong-coupling or a large pseudogap. On the other hand, in agreement with the previous report, we observe a Pauli-limiting critical field in Nd$_{1-x}$Sr$_x$NiO$_2$ and the superconducting anisotropy decreases as doping increases, suggesting a spin-singlet pairing. Therefore, superconductivity in La$_{1-x}$(Ca/Sr)$_x$NiO$_2$ could be driven by a non-spin-singlet Cooper pairing mechanism with an attractive high-$T_c$ at 10 K, an order of magnitude higher than the known spin triplet superconductors, favourably extending the application of spin-triplet superconductivity in topological matter, non-dissipative spintronics, and quantum computing. Comment: 21 pages, 4 main figures, 2 extended data |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/2204.12606Test |
| رقم الانضمام: | edsarx.2204.12606 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |