2008/10/31 by Hendrik Bluhm, Nicholas C. Koshnick, Julie A. Bert +3 · 5 citations
Chemistry · Physics and Astronomy · #Amplitude #Anomaly (physics) #Chemistry #Condensed matter physics #Magnetic field #Magnetic flux #Magnetic properties of thin films #Materials science #Mesoscopic physics #Molecular physics #Nuclear magnetic resonance #Optics #Persistent current #Physics #Quantum and electron transport phenomena #Quantum mechanics #Ring (chemistry) #Spins #Superconductivity #Theoretical and Computational Physics #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.102.136802
Journal version. 4+ pages, 3 figures. See http://stanford.edu/group/moler/publications.html for the auxiliary document containing additional data and discussion (Ref. 29). Changes w.r.t. v1: Clarified some details in introduction and regarding experimental procedures, shortened abstract, added references and fixed some typos
arxiv created 2009/03/13 · openalex publication_date 2009/03/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The authors have measured the magnetic response of 33 individual cold mesoscopic gold rings, one ring at a time. The response of some sufficiently small rings has a component that is periodic in the flux through the ring and is attributed to a persistent current. Its period is close to h/e, and its sign and amplitude vary between rings. The amplitude distribution agrees well with predictions for the typical h/e current in diffusive rings. The temperature dependence of the amplitude, measured for four rings, is also consistent with theory. These results disagree with previous measurements of three individual metal rings that showed a much larger periodic response than expected. The use of a scanning SQUID microscope enabled in situ measurements of the sensor background. A paramagnetic linear susceptibility and a poorly understood anomaly around a zero field are attributed to defect spins.