Abstract
We have investigated the newly discovered pressure-induced magnetic ordering phase in $\mathrm{Yb}\mathrm{In}{\mathrm{Cu}}_{4}$ using dc magnetization, nuclear magnetic resonance (NMR), and x-ray diffraction measurements. The dc magnetization measurements provide evidence for the appearance of spontaneous magnetization above $3\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and enable us to establish a pressure-temperature phase diagram for $\mathrm{Yb}\mathrm{In}{\mathrm{Cu}}_{4}$ over a wide pressure range up to $27\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. It is shown that, while the valence transition temperature ${T}_{V}$ is strongly reduced with increasing pressure, the magnetic ordering temperature ${T}_{M}$ reveals a very weak pressure dependence. We find no evidence for any structural phase transition up to $15\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ within the experimental accuracy. The Curie-Weiss temperature dependence of susceptibility in pressure-stabilized paramagnetic state is evaluated from the Knight shift data obtained from $^{115}\mathrm{In}$ NMR measurements. From these experimental results, we discuss possible electronic states of the $4f$ electrons in the high pressure magnetically ordered phase of $\mathrm{Yb}\mathrm{In}{\mathrm{Cu}}_{4}$.
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