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The renormalization factor, dubbed ``quasiparticle charge'' Z_e, of thecoupling between the supercurrent and quasiparticles was analyzed in thecontext of high temperature cuprates in a recent paper by Ioffe and Millis.They observed that Z_e in cuprates deviates from the BCS value (Z_e=1), whichwas interpreted as the proximity effect near a Mott insulator. Here we showthat the deviation from Z_e=1 can occur, in general, even in the absence ofquasiparticle interactions, when the superconducting order coexists withanother order parameter with the same internal symmetry. As an example, wecompute the coefficient of the linear temperature dependence of the superfluiddensity when the d-wave superconducting state coexists with the orbitalantiferromagnetic state (d-density wave), and find that Z_e varies from1/\sqrt{2} to 1.Comment: 4 pages, no figur

Quasiparticle charge in superconductors: Effect of Mott physics or hidden order parameter