Resistance fluctuations in superconducting KxFe2-ySe2 single crystals studied by low-frequency noise spectroscopy

doi:10.1088/1674-1056/abf103

中国物理B ›› 2021, Vol. 30 ›› Issue (4): 47402-.doi: 10.1088/1674-1056/abf103

收稿日期:2021-01-30 修回日期:2021-03-04 接受日期:2021-03-23 出版日期:2021-03-16 发布日期:2021-04-02

Resistance fluctuations in superconducting K_xFe_2-ySe₂ single crystals studied by low-frequency noise spectroscopy

Hai Zi(子海)¹, Yuan Yao(姚湲)^2,†, Ming-Chong He(何明冲)¹, Di Ke(可迪)¹, Hong-Xing Zhan(詹红星)¹, Yu-Qing Zhao(赵宇清)¹, Hai-Hu Wen(闻海虎)³, and Cong Ren(任聪)^1,‡

1 Physics Department, School of Physics and Astronomy, Yunnan University, Kunming 50500, China; 2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China; 3 Physics Department, Nanjing University, Nanjing 210093, China

Received:2021-01-30 Revised:2021-03-04 Accepted:2021-03-23 Online:2021-03-16 Published:2021-04-02
Contact: ^†Corresponding author. E-mail: yaoyuan@iphy.ac.cn ^‡Corresponding author. E-mail: cren_ynu@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774303 and 11574373) and Joint Fund of Yunnan Provincial Science and Technology Department, China (Grant No. 2019FY003008).

摘要/Abstract

Abstract: Low-frequency resistance noise spectroscopy is applied to investigate bulk single crystals of the intercalated iron-selenide K_xFe_2-ySe₂ superconductors with different iron vacancy orders. Based on a generalized fluctuation model, the well-observed resistance hump above 100 K is interpreted as an insulator-metal phase transition with a characteristic transition energy of 0.1-0.6 eV, indicating a highly inhomogeneous energy distribution configuration. In the superconducting transition regime, we find that the normalized resistance noise scales with resistance R excellently as S_R/R² ∝ R^l_rs with the noise exponent l_rs≈ 1.4. With reduced iron vacancy disordering in enhanced superconductivity K_xFe_2-ySe₂ crystals, the level of resistance fluctuations is greatly suppressed, suggesting a geometrical phase transition for conduction channel, which is directly related to the microstructure of the crystals.

Key words: K_xFe_2-ySe₂, phase separation, noise and chaos, percolation

中图分类号: (Noise and chaos)

74.40.De

74.81.-g (Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities) 64.60.ah (Percolation)

. [J]. 中国物理B, 2021, 30(4): 47402-.

Hai Zi(子海), Yuan Yao(姚湲), Ming-Chong He(何明冲), Di Ke(可迪), Hong-Xing Zhan(詹红星), Yu-Qing Zhao(赵宇清), Hai-Hu Wen(闻海虎), and Cong Ren(任聪). Resistance fluctuations in superconducting K_xFe_2-ySe₂ single crystals studied by low-frequency noise spectroscopy[J]. Chin. Phys. B, 2021, 30(4): 47402-.

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Resistance fluctuations in superconducting K_xFe_2-ySe₂ single crystals studied by low-frequency noise spectroscopy

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