Quantum Criticality and Nodal Superconductivity in the FeAs-Based SuperconductorKFe2As2
| العنوان: | Quantum Criticality and Nodal Superconductivity in the FeAs-Based SuperconductorKFe2As2 |
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| المؤلفون: | Xuepeng Qiu, Yu He, T. Y. Guan, Xianhui Chen, Shiyan Li, Y. F. Dai, X. F. Wang, S. Y. Zhou, Han Zhang, J. K. Dong |
| المصدر: | Physical Review Letters. 104 |
| بيانات النشر: | American Physical Society (APS), 2010. |
| سنة النشر: | 2010 |
| مصطلحات موضوعية: | Superconductivity, Physics, Condensed matter physics, Electrical resistivity and conductivity, Condensed Matter::Superconductivity, Quantum critical point, General Physics and Astronomy, Antiferromagnetism, Cuprate, Fermi liquid theory, Critical field, Spin-½ |
| الوصف: | The in-plane resistivity rho and thermal conductivity kappa of the FeAs-based superconductor KFe2As2 single crystal were measured down to 50 mK. We observe non-Fermi-liquid behavior rho(T) approximately T{1.5} at H{c{2}}=5 T, and the development of a Fermi liquid state with rho(T) approximately T{2} when further increasing the field. This suggests a field-induced quantum critical point, occurring at the superconducting upper critical field H{c{2}}. In zero field, there is a large residual linear term kappa{0}/T, and the field dependence of kappa_{0}/T mimics that in d-wave cuprate superconductors. This indicates that the superconducting gaps in KFe2As2 have nodes, likely d-wave symmetry. Such a nodal superconductivity is attributed to the antiferromagnetic spin fluctuations near the quantum critical point. |
| تدمد: | 1079-7114 0031-9007 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::f689613de4bc71382f6de7c0399e095a https://doi.org/10.1103/physrevlett.104.087005 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........f689613de4bc71382f6de7c0399e095a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10797114 00319007 |
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