We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Universal scaling of tunable Yu-Shiba-Rusinov states across the quantum phase transition.
- Authors
Huang, Haonan; Karan, Sujoy; Padurariu, Ciprian; Kubala, Björn; Cuevas, Juan Carlos; Ankerhold, Joachim; Kern, Klaus; Ast, Christian R.
- Abstract
Quantum magnetic impurities give rise to a wealth of phenomena attracting tremendous research interest in recent years. On a normal metal, magnetic impurities generate the correlation-driven Kondo effect. On a superconductor, bound states emerge inside the superconducting gap called the Yu-Shiba-Rusinov (YSR) states. Theoretically, quantum impurity problems have been successfully tackled by numerical renormalization group (NRG) theory, where the Kondo and YSR physics are shown to be unified and the normalized YSR energy scales universally with the Kondo temperature divided by the superconducting gap. However, experimentally the Kondo temperature is usually extracted from phenomenological approaches, which gives rise to significant uncertainties and cannot account for magnetic fields properly. Using scanning tunneling microscopy at 10 mK, we apply a magnetic field to several YSR impurities on a vanadium tip to reveal the Kondo effect and employ the microscopic single impurity Anderson model with NRG to fit the Kondo spectra in magnetic fields accurately and extract the corresponding Kondo temperature unambiguously. Some YSR states move across the quantum phase transition (QPT) due to the changes in atomic forces during tip approach, yielding a continuous universal scaling with quantitative precision for quantum spin- 1 2 impurities. Magnetic impurities can induce a range of exotic phenomena, including the famous Kondo effect in metallic systems and bound states in superconductors. Here, using scanning tunneling microscopy, the authors investigate magnetic impurities on a superconducting vanadium tip and analyse the scaling between the Yu-Shiba-Rusinov state energy and the Kondo temperature.
- Subjects
QUANTUM phase transitions; KONDO effect; MAGNETIC impurities; SCANNING tunneling microscopy; QUANTUM states
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01332-8