  The Nernst coefficient of CeCoIn5 displays a distinct anomaly at H_K ~ 23 T.
This feature is reminiscent of what is observed at 7.8 T in CeRu2Si2, a
well-established case of metamagnetic transition. New frequencies are observed
in de Haas-van Alphen oscillations when the field exceeds 23 T, which may
indicate a modification of the Fermi surface at this field.
