  Previous studies indicate that interplanetary small magnetic flux ropes
(SMFRs) are manifestations of microflare-associated small coronal mass
ejections (CMEs), and the hot material with high charge states heated by
related microflares are found in SMFRs. Ordinary CMEs are frequently associated
with prominence eruptions,and cool prominencematerialsare found within some
magnetic clouds (MCs). Therefore, the predicted small CMEs may also be
frequently associated with small prominence eruptions. In this work, we aim to
search for cool prominence materials within SMFRs.We examined all the O5+ and
Fe6+ fraction data obtained by the Advanced Composition Explorer spacecraft
during 1998 to 2008 and found that 13 SMFRs might exhibit low-charge-state
signatures of unusual O5+and/or Fe6+abundances.One of the 13 SMFRs also
exhibited signatures of high ionic charge states. We also reported a SMFR with
highFe6+ fraction, but the values of Fe6+is a little lower than the threshold
defining unusualFe6+.However, the SDO/AIA observations confirmed that the
progenitor CME of this SMFR is associated with a small eruptive prominence, and
the observations also supported the prominence materials were embedded in the
CME.These observations are at the edge of the capabilities of ACE/SWICS and it
cannot be ruled out that they are solely caused by instrumental effects. If
these observations are real, they provide new evidence for the conjecture that
SMFRs are small-scale MCs but also imply that the connected small CMEs could be
associated with flares and prominence eruptions.
