Nearly Isotropic Vortex Solid in (La,Pr)3Ni2O7 Thin Films
Abstract
The discovery of superconductivity in bulk bilayer nickelates has established a new platform for exploring high-Tc superconductivity beyond the cuprates. The role of the Ni 3dz2-derived γ band in the superconductivity of bilayer nickelates remains unresolved. By performing simultaneous resistance and diamagnetism measurements on (La,Pr)3Ni2O7 thin films, we map the vortex melting phase diagram for both in-plane and out-of-plane magnetic fields. For H∥ c, the geometric confinement effect gives rise to pancake vortices. Remarkably, the anisotropy parameter of the vortex melting field γHm ≡ Hmab/Hmc decreases monotonically with decreasing temperature and approaches unity at low temperatures. Within the anisotropic Ginzburg--Landau scaling, Hmab/Hmc = √(ρsab/ρsc) tracks the superfluid-density anisotropy. Such a vortex solid implies a nearly isotropic superfluid density, which is irreconcilable with the strictly two-dimensional 3dx2−y2-derived bands, but naturally explained by a substantial interlayer superfluid contribution from the 3dz2-derived γ band. Our results provide thermodynamic evidence for a substantial contribution of the γ band to superconductivity in bilayer nickelate thin films.
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BibTeX
@misc{bian2026nearly,
title = {{Nearly Isotropic Vortex Solid in $\mathbf(La,Pr)_3Ni_2O_7$ Thin Films}},
author = {Yaolong Bian and Yaqi Chen and Heng Wang and Guangdi Zhou and Fei Peng and Zichen Lv and Jiaqiang Cai and Yifan Chen and Wenjie Meng and Ze Wang and Haoliang Huang and Daohua Zhang and Mingliang Tian and Jinfeng Jia and Qi-kun Xue and Zhuoyu Chen and Jinglei Zhang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.07510},
eprint = {2609.07510},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07510},
}
RIS
TY - UNPB
TI - Nearly Isotropic Vortex Solid in (La,Pr)_3Ni_2O_7 Thin Films
AU - Yaolong Bian
AU - Yaqi Chen
AU - Heng Wang
AU - Guangdi Zhou
AU - Fei Peng
AU - Zichen Lv
AU - Jiaqiang Cai
AU - Yifan Chen
AU - Wenjie Meng
AU - Ze Wang
AU - Haoliang Huang
AU - Daohua Zhang
AU - Mingliang Tian
AU - Jinfeng Jia
AU - Qi-kun Xue
AU - Zhuoyu Chen
AU - Jinglei Zhang
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2609.07510
UR - https://arxiv.org/abs/2609.07510
AB - The discovery of superconductivity in bulk bilayer nickelates has established a new platform for exploring high-T_c superconductivity beyond the cuprates. The role of the Ni 3d_z^2-derived γ band in the superconductivity of bilayer nickelates remains unresolved. By performing simultaneous resistance and diamagnetism measurements on (La,Pr)_3Ni_2O_7 thin films, we map the vortex melting phase diagram for both in-plane and out-of-plane magnetic fields. For H∥ c, the geometric confinement effect gives rise to pancake vortices. Remarkably, the anisotropy parameter of the vortex melting field γ_H_m ≡ H_m^ab/H_m^c decreases monotonically with decreasing temperature and approaches unity at low temperatures. Within the anisotropic Ginzburg--Landau scaling, H_m^ab/H_m^c = √(ρ_s^ab/ρ_s^c) tracks the superfluid-density anisotropy. Such a vortex solid implies a nearly isotropic superfluid density, which is irreconcilable with the strictly two-dimensional 3d_x^2−y^2-derived bands, but naturally explained by a substantial interlayer superfluid contribution from the 3d_z^2-derived γ band. Our results provide thermodynamic evidence for a substantial contribution of the γ band to superconductivity in bilayer nickelate thin films.
ER -