Superconducting gap and enhanced superconductivity by cleaving process in KV3Sb5
Wei Chen, Lichen Ji, Xinyu Zhou, Hongxiu Liu, Fanqi Meng, Zichun Zhang, Yaowu Liu, Xiaopeng Hu, Qinghua Zhang, Youguo Shi, Lin Gu, Xi Chen, Qi-Kun Xue, Shuai-Hua Ji
DOI 10.1103/PhysRevMaterials.8.074601 · Physical Review Materials
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Abstract
Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have attracted great attention recently due to the topological electronic bands and rich many-body states. Here, we report the unusual superconducting gap of about 0.10 meV of KV3Sb5, which cannot be fitted by BCS theory, measured by a dilution refrigerator scanning tunneling microscope. Uniform superconducting gaps on a potassium-terminated surface have been revealed by spatially resolved scanning tunneling spectra. Temperature-dependent tunneling spectra unveil that the superconducting transition temperature is about 0.73 K on a cleaved surface. Due to the desorption of potassium, it is slightly lower than the bulk superconducting transition temperature of 0.92 K determined by transport measurement. In addition, our electronic transport measurement of thin flakes shows an enhanced superconducting transition onset temperature up to 2.15 K, which is possibly attributed to the strain effect caused by their underling cleaving tapes. Our work sheds light on understanding the unusual superconducting state of a vanadium-based kagome superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.73 | Pressure not reported | onset |
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.92 | Pressure not reported | zero_resistance |
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.15 | Pressure not reported | onset |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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