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We performed temperature- and doping-dependent high-resolution Ramanspectroscopy experiments on YBa$_2$Cu$_3$O$_{7-\delta}$ to study $B$$_{\rm 1g}$phonons. The temperature dependence of the real part of the phonon self-energyshows a distinct kink at $T=T_{\rm B1g}$ above $T$$_{\rm c}$ due to softening,in addition to the one due to the onset of the superconductivity. $T$$_{\rmB1g}$ is clearly different from the pseudogap temperature with a maximum in theunderdoped region. The region between $T$$_{\rm B1g}$ and $T$$_{\rm c}$resembles that of superconducting fluctuation or charge density wave order.While the true origin of the $B$$_{\rm 1g}$ phonon softening is not known, wecan attribute it to a gap on the Fermi surface due to an electronic order. Ourresults may reveal the role of the $B$$_{\rm 1g}$ phonon not only in thesuperconducting state but also in the intertwined orders in multilayer copperoxide high-$T$$_{\rm c}$ superconductors.

$B_{\rm 1g}$ phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa$_2$Cu$_3$O$_{7-\delta}$