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We investigate "instantaneous interquark potential", an interestinggauge-dependent quantity defined from the spatial correlator $<\mathrm{Tr}[U_4^\dagger(s)U_4(s')]>$ of the temporal link-variable $U_4$, in detail ingeneralized Landau gauge using SU(3) quenched lattice QCD. While theinstantaneous potential has no linear part in the Landau gauge, in the Coulombgauge, it is expressed by the Coulomb plus linear potential, where the slope is2-3 times larger than the physical string tension, and the lowest energy stateis considered to be a gluon-chain state. Using the generalized Landau gauge, wefind that the instantaneous potential can be continuously described between theLandau and the Coulomb gauges, and it approximately reproduces the physicalinterquark potential in a specific intermediate gauge, which we call"$\lambda_C$-gauge". This $\lambda_C$-gauge is expected to provide aquark-potential-model picture, where dynamical gluons do not appear. We alsoinvestigate $T$-length terminated Polyakov-line correlator and itscorresponding "finite-time potential" in generalized Landau gauge.

Instantaneous interquark potential in generalized Landau gauge in SU(3) lattice QCD: a possible gauge for the quark potential model