Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite-Layer Lanthanum Nickelates,Advanced Materials

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Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite-Layer Lanthanum Nickelates
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-26 , DOI: 10.1002/adma.202303400
Wenjie Sun ₁ , Yueying Li ₁ , Ruxin Liu ₂ , Jiangfeng Yang ₁ , Jiayi Li ₁ , Wei Wei ₃ , Gangjian Jin ₄ , Shengjun Yan ₁ , Haoying Sun ₁ , Wei Guo ₁ , Zhengbin Gu ₁ , Zengwei Zhu ₅ , Yue Sun ₃ , Zhixiang Shi ₃ , Yu Deng ₁ , Xuefeng Wang ₂ , Yuefeng Nie ₁

Affiliation

After being expected to be a promising analog to cuprates for decades, superconductivity has recently been discovered in infinite-layer nickelates, providing new opportunities to explore mechanisms of high-temperature superconductivity. However, in sharp contrast to the single-band and anisotropic superconductivity in cuprates, nickelates exhibit a multi-band electronic structure and an unexpected isotropic superconductivity as reported recently, which challenges the cuprate-like picture in nickelates. Here, it is shown that strong anisotropic magnetotransport behaviors exist in La-based nickelate films with enhanced crystallinity and superconductivity (

T_{c}^{onset} $T_{\rm{c}}^{{\rm{onset}}}$

= 18.8 K,

T_{c}^{zero} $T_{\rm{c}}^{{\rm{zero}}}$

= 16.5 K). The upper critical fields are anisotropic and violate the estimated Bardeen–Cooper–Schrieffer (BCS) Pauli limit (

H_{Pauli, μ = 1 μ_{B}} = 1.86 \times T_{c, H = 0} ${H}_{\mathrm{Pauli},\mu =1{\mu}_{B}}=1.86\ensuremath{\times{}}{T}_{\mathrm{c},H=0}$

) for in-plane magnetic fields. Moreover, the anisotropic superconductivity is further manifested by the cusp-like peak of the angle-dependent T_c and the vortex motion anisotropy under external magnetic fields.

中文翻译：

无限层镍酸镧中各向异性超导超出泡利极限的证据

几十年来人们一直期望成为铜酸盐的有前途的类似物，最近在无限层镍酸盐中发现了超导性，为探索高温超导机制提供了新的机会。然而，与铜酸盐中的单能带和各向异性超导性形成鲜明对比的是，镍酸盐表现出多能带电子结构和意想不到的各向同性超导性，这对镍酸盐中类似铜酸盐的图像提出了挑战。研究表明，具有增强结晶度和超导性的 La 基镍酸盐薄膜中存在强各向异性磁输运行为（