Abstract
It has been known for some time that, at temperatures below 100 K, the band gap of ${\mathrm{AgGaS}}_{2}$ exhibits an anomalous blue shift with increase in temperature. We have found that this anomalous blue shift can be suppressed completely by as little as 1% of Cu in ${\mathrm{AgCuGaS}}_{2}$ alloys. In conjunction with the disappearance of the blue shift, soft-phonon sidebands to the one-phonon Raman peaks are greatly broadened and no longer resolvable as distinct peaks. Our results are consistent with the suggestion that a soft-phonon mode may be responsible for this anomalous blue shift in ${\mathrm{AgGaS}}_{2}.$
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