Discriminating superconducting fluctuations from the pseudogap in Bi2Sr2Can−1CunO2n+4+δ (n = 2,3): A magnetotransport study
Abstract
Understanding the normal state is essential for uncovering the mechanism of high-Tc superconductivity. We investigate magnetotransport in Bi2Sr2CaCu2O8+δ and Bi2Sr2Ca2Cu3O10+δ single crystals over a wide doping range. While the in-plane resistivity and Hall coefficient show strong pseudogap-induced temperature dependence, the T2 Hall-angle behavior and the modified Kohler's rule remain robust across all dopings. The onset temperatures of the pseudogap are clearly distinct from superconducting fluctuations, although they scale with the pseudogap magnitudes with a factor consistent with a d-wave superconductor. These results demonstrate that the pseudogap does not arise from superconducting fluctuations and instead suggest that it may originate from preformed Cooper pairing in the BCS-BEC crossover regime.
Versions
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BibTeX
@misc{yamaguchi2026discriminating,
title = {{Discriminating superconducting fluctuations from the pseudogap in Bi$_2$Sr$_2$Ca$_n-1$Cu$_n$O$_2n+4+δ (n = 2,3)$: A magnetotransport study}},
author = {Shunpei Yamaguchi and Nae Sasaki and Shintaro Adachi and Keiichi Harada and Yuki Teramoto and Shintaro Matsuda and Tomohiro Usui and Takenori Fujii and Takashi Noji and Itsuhiro Kakeya and Haruka Taniguchi and Michiaki Matsukawa and Atsushi Miyake and Hajime Ishikawa and Koichi Kindo and Takao Watanabe},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.11284},
eprint = {2608.11284},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.11284},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Discriminating superconducting fluctuations from the pseudogap in Bi_2Sr_2Ca_n−1Cu_nO_2n+4+δ (n = 2,3): A magnetotransport study
AU - Shunpei Yamaguchi
AU - Nae Sasaki
AU - Shintaro Adachi
AU - Keiichi Harada
AU - Yuki Teramoto
AU - Shintaro Matsuda
AU - Tomohiro Usui
AU - Takenori Fujii
AU - Takashi Noji
AU - Itsuhiro Kakeya
AU - Haruka Taniguchi
AU - Michiaki Matsukawa
AU - Atsushi Miyake
AU - Hajime Ishikawa
AU - Koichi Kindo
AU - Takao Watanabe
PY - 2026
DA - 2026/08/11
PB - arXiv
DO - 10.48550/arxiv.2608.11284
UR - https://arxiv.org/abs/2608.11284
AB - Understanding the normal state is essential for uncovering the mechanism of high-T_c superconductivity. We investigate magnetotransport in Bi_2Sr_2CaCu_2O_8+δ and Bi_2Sr_2Ca_2Cu_3O_10+δ single crystals over a wide doping range. While the in-plane resistivity and Hall coefficient show strong pseudogap-induced temperature dependence, the T^2 Hall-angle behavior and the modified Kohler's rule remain robust across all dopings. The onset temperatures of the pseudogap are clearly distinct from superconducting fluctuations, although they scale with the pseudogap magnitudes with a factor consistent with a d-wave superconductor. These results demonstrate that the pseudogap does not arise from superconducting fluctuations and instead suggest that it may originate from preformed Cooper pairing in the BCS-BEC crossover regime.
ER -