Anomalous quantum Griffiths singularity in ultrathin crystalline lead films
| Autor: | Xi Lin, Jian Wang, Pujia Shan, Yue Tang, Ying Xing, Chaofei Liu, Haiwen Liu, Yi Liu, Ziqiao Wang, Xingwang Xie, Qingyan Wang, Cheng Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Quantum phase transition Phase boundary Materials science Electronic properties and materials Science FOS: Physical sciences General Physics and Astronomy 02 engineering and technology General Biochemistry Genetics and Molecular Biology Article Superconducting properties and materials Superconductivity (cond-mat.supr-con) 03 medical and health sciences Surfaces interfaces and thin films Quantum critical point Condensed Matter::Superconductivity lcsh:Science Quantum Critical field Quantum fluctuation Superconductivity Multidisciplinary Condensed matter physics Condensed Matter - Superconductivity General Chemistry 021001 nanoscience & nanotechnology 030104 developmental biology lcsh:Q 0210 nano-technology Critical exponent |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-6 (2019) |
| ISSN: | 2041-1723 |
| Popis: | Superconductor-insulator/metal transition (SIT/SMT) represents a prototype of quantum phase transition, where quantum fluctuation plays a dominant role and dramatically changes the physical properties of low-dimensional superconducting systems. Recent observation of quantum Griffiths singularity (QGS) offers an essential perspective to understand the subtleties of quantum phase transition in two-dimensional superconductors. Here we study the magnetic field induced SMT in ultrathin crystalline Pb films down to ultralow temperatures. The divergent critical exponent is observed when approaching zero temperature quantum critical point, indicating QGS. Distinctively, the anomalous phase boundary of SMT that the onset critical field decreases with decreasing temperatures in low temperature regime distinguishes our observation from previous reports of QGS in various two-dimensional superconductors. We demonstrate that the anomalous phase boundary originates from the superconducting fluctuations in ultrathin Pb films with pronounced spin-orbit interaction. Our findings reveal a novel aspect of QGS of SMT in two-dimensional superconductors with anomalous phase boundary. Evidence of quantum phase transitions is normally difficult to be detected. Here, Liu and Wang et al. report divergent critical exponent in ultrathin Pb films with superconducting fluctuations and spin-orbit interaction, indicating an anomalous quantum Griffiths singularity of superconductor-metal transition. |
| Databáze: | OpenAIRE |
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