Observation of Feshbach Resonances in an Ultracold Gas ofCr52

• DOI: 10.1103/physrevlett.94.183201
• Publication Date: 2005-05-09T17:20:11Z
• Authors: J. Werner; A. Griesmaier; S. Hensler; J. Stuhler; T. Pfau; A. Simoni; E. Tiesinga
• Keywords: Condensed Matter - Other Condensed Matter; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences; Other Condensed Matter (cond-mat.other)

4 pages, 2 figures, 1 table<br/>We have observed Feshbach resonances in elastic collisions between ultracold ${}^{52}$Cr atoms. This is the first observation of collisional Feshbach resonances in an atomic species with more than one valence electron. The zero nuclear spin of ${}^{52}$Cr and thus the absence of a Fermi-contact interaction leads to regularly-spaced resonance sequences. By comparing resonance positions with multi-channel scattering calculations we determine the s-wave scattering length of the lowest $^{2S+1}��_{g}^{+}$ potentials to be $\unit[112(14)]{a_0}$, $\unit[58(6)]{a_0}$ and $-\unit[7(20)]{a_0}$ for S=6, 4, and 2, respectively, where $a_{0}=\unit[0.0529]{nm}$.<br/>