Diamagnetic response of a superconducting surface superstructure: Si(111)-√7 × √3-In

Wu Yanfu; Duan Ming-Chao; Liu Ningning; Yao Gang; Guan Dandan; Wang Shiyong; Li Yao-Yi; Zheng Hao; Liu Canhua; Jia Jin-Feng

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Diamagnetic response of a superconducting surface superstructure: Si(111)-√7 × √3-In

机译：超导表面上层建筑的抗磁响应：Si（111）-7×1/3英寸

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Macroscopic superconductivity in various ultrathin films at the ultimate two-dimensional limit, i.e., films with thickness of only one- or two-atomic layers supported by single-crystal surfaces, has manifested itself in experiments with only zero resistance but not yet with the Meissner effect due to the lack of a proper in situ technique, although both phenomena are the defining characteristics of a superconductor. Using a self-developed multifunctional scanning tunneling microscope, we succeeded in detecting not only the macroscopic supercurrent but also diamagnetic response of a two-atomic-layer indium film on a Si(111) surface. The diamagnetic measurements reveal that the low-temperature variation of penetration depth follows the BardeenCooper-Schrieffer theory in the dirty limit. The magnitude of the pair-breaking interaction is determined to be 0.80 from the magnetic field dependence of the zero-temperature penetration depth, which implies that the pairing symmetry deviates slightly from an isotropic s wave. The present work demonstrates that it is possible to observe the Meissner effect in ultrathin superconducting films that are vulnerable to air, which is very helpful for a detailed understanding of the microscopic pairing mechanism.

机译：在极限二维极限的各种超薄膜中的宏观超导，即，具有单晶表面支撑的厚度的厚度的薄膜，在实验中表现出仅具有零阻力但尚未与Meissner的实验效果由于缺乏适当的原位技术，尽管这两种现象都是超导体的定义特征。使用自开发的多功能扫描隧穿显微镜，我们不仅在Si（111）表面上的两种原子层铟膜的宏观超电流而且还在宏观上进行检测。抗磁测量表明，渗透深度的低温变化在脏限制中遵循Bardeenooper-Schrieffer理论。根据零温度渗透深度的磁场依赖性确定配对相互作用的幅度为0.80，这意味着配对对称性偏离各向同性波略微偏离。本作者表明，可以观察易受空气的超超导膜中的萌效应，这对于对微观配对机构的详细了解非常有帮助。

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来源
《Physical review》 |2019年第14期|140506.1-140506.5|共5页
作者
Wu Yanfu; Duan Ming-Chao; Liu Ningning; Yao Gang; Guan Dandan; Wang Shiyong; Li Yao-Yi; Zheng Hao; Liu Canhua; Jia Jin-Feng;
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Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

Shanghai Jiao Tong Univ Sch Phys & Astron Key Lab Artificial Struct & Quantum Control Minist Educ 800 Dongchuan Rd Shanghai 200240 Peoples R China|Shenyang Natl Lab Mat Sci Shenyang 110016 Liaoning Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China|Tsung Dao Lee Inst Shanghai 200240 Peoples R China;

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1. Diamagnetic response of a superconducting surface superstructure: Si(111)-√7 × √3-In [J] . Wu Yanfu, Duan Ming-Chao, Liu Ningning, Physical review . 2019,第14期

机译：超导表面上部结构的反磁响应：Si（111）-√7×√3-In
2. Diamagnetic response of a superconducting surface superstructure: Si(111)-root 7 x root 3-In [J] . Wu Yanfu, Duan Ming-Chao, Liu Ningning, Physical review, B . 2019,第14期

机译：超导表面上层结构的抗磁响应：Si（111） - root 7 x根3英寸
3. Structure determination of the Si(111)-root 7 x root 3-In atomic-layer superconductor [J] . Shirasawa Tetsuroh, Yoshizawa Shunsuke, Takahashi Toshio, Physical review, B . 2019,第10期

机译：Si（111）的结构确定 - root 7 x根3- in原子层超导体
4. Ab initio calculation of optical second harmonic responses of Si(111) surfaces [C] . H. Sano, G. Mizutani, W. Wolf, Conference on Nonlinear Optics Jul 28-Aug 2, 2002 null . 2002

机译：Si（111）表面的光学二次谐波响应从头算
5. THEORY OF SURFACE IMPEDANCE RESONANCES IN SUPERCONDUCTORS (LOW TEMPERATURE, LINEAR RESPONSE, QUASIPARTICLES, LINESHAPES, MAGNETIC FIELD). [D] . SLINKMAN, JAMES ALBERT. 1986

机译：超导体中的表面阻抗共振理论（低温，线性响应，拟粒子，线性形状，磁场）。
6. Delocalized Surface State in Epitaxial Si(111) Film with Spontaneous √3 × √3 Superstructure [O] . Jian Chen, Yi Du, Zhi Li, -1

机译：自发的√3×√3超结构的外延Si（111）薄膜的离域表面态
7. Anisotropic diamagnetic response in type-II superconductors with gap and fermi-surface anisotropies [O] . Adachi, H, Miranovic, P, Ichioka, M, 2005

机译：具有间隙和费米表面各向异性的II型超导体的各向异性反磁响应

Diamagnetic response of a superconducting surface superstructure: Si(111)-√7 × √3-In

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