Possible unconventional magnetism in nematic CsTi3Bi5 kagome supercondutor

We propose a zero-field muon spin relaxation investigation of the nematic CsTi3Bi5 kagome superconductor. Nematicity is a ubiquitous feature to many superconductors, such as the cuprates, and it is thought to be a possible drive for the Cooper pairs formation. This kagomè family is also believed to host unconventional magnetism related to a time reversal symmetry breaking (TRSB) phenomenon. This was recently attributed to the presence of loop currents, arising from the formation of a charge density wave state. However, our preliminary spin-resolved photoelectron spectroscopy data from circular dichroism suggest a strong time-reversal symmetry breaking even for CsTi3Bi5, which does not undergo any charge density wave. Here we search for the decisive fingerprint of TRSB in CsTi3Bi5 by exploiting the great sensitivity of muons to low local fields.