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28 March 2024
 
  » arxiv » cond-mat/0207717

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Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6-Li
K.M. O’Hara ; S.L. Hemmer ; S.R. Granade ; M.E. Gehm ; J.E. Thomas ; V.Venturi ; E. Tiesinga ; C.J. Williams ;
Date 30 Jul 2002
Subject Soft Condensed Matter; Superconductivity | cond-mat.soft cond-mat.supr-con
AbstractWe measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6-Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of magnetic field B. The temperature decrease and atom loss are minimized for B=528(4) G, consistent with no evaporation. We also present preliminary calculations using potentials that have been constrained by the measured zero crossing and locate a broad Feshbach resonance at approximately 860 G, in agreement with previous theoretical predictions. In addition, our theoretical model predicts a second and much narrower Feshbach resonance near 550 G.
Source arXiv, cond-mat/0207717
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