  The Advanced Molybdenum-based Rare process Experiment (AMoRE) aims to search
for neutrinoless double beta decay (0$\nu\beta\beta$) of $^{100}$Mo with
$\sim$100 kg of $^{100}$Mo-enriched molybdenum embedded in cryogenic detectors
with a dual heat and light readout. At the current, pilot stage of the AMoRE
project we employ six calcium molybdate crystals with a total mass of 1.9 kg,
produced from $^{48}$Ca-depleted calcium and $^{100}$Mo-enriched molybdenum
($^{48\textrm{depl}}$Ca$^{100}$MoO$_4$). The simultaneous detection of
heat(phonon) and scintillation (photon) signals is realized with high
resolution metallic magnetic calorimeter sensors that operate at milli-Kelvin
temperatures. This stage of the project is carried out in the Yangyang
underground laboratory at a depth of 700 m. We report first results from the
AMoRE-Pilot $0\nu\beta\beta$ search with a 111 kg$\cdot$d live exposure of
$^{48\textrm{depl}}$Ca$^{100}$MoO$_4$ crystals. No evidence for
$0\nu\beta\beta$ decay of $^{100}$Mo is found, and a upper limit is set for the
half-life of 0$\nu\beta\beta$ of $^{100}$Mo of $T^{0\nu}_{1/2} >
9.5\times10^{22}$ y at 90% C.L.. This limit corresponds to an effective
Majorana neutrino mass limit in the range $\langle
m_{\beta\beta}\rangle\le(1.2-2.1)$ eV.
