Evidence for competing magnetic instabilities in underdoped $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$

Abstract

We report a polarized neutron scattering study of the orbital-like magnetic order in strongly underdoped $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.45}$ and $\mathrm{YB}{\mathrm{a}}_2(\mathrm{C}{\mathrm{u}}_{0.98}\mathrm{Z}{\mathrm{n}}_{0.02}{)}_3{\mathrm{O}}_{6.6}$. Their hole doping levels are located on both sides of the critical doping $p_{MI}$ of a metal-insulator transition inferred from transport measurements. Our study reveals a drop down of the orbital-like order slightly below $p_{MI}$ with a steep decrease of both the ordering temperature $T_{mag}$ and the ordered moment. Above $p_{MI}$, substitution of quantum impurities does not change $T_{mag}$, whereas it lowers significantly the bulk ordered moment. The modifications of the orbital-like magnetic order are interpreted in terms of a competition with electronic liquid crystal phases around $p_{MI}$. This competition gives rise to a mixed magnetic state in $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.45}$ and a phase separation in $\mathrm{YB}{\mathrm{a}}_2(\mathrm{C}{\mathrm{u}}_{0.98}\mathrm{Z}{\mathrm{n}}_{0.02}{)}_3{\mathrm{O}}_{6.6}$.

arXiv commentSubmitted to PRB, 7 figures; http://link.aps.org/doi/10.1103/PhysRevB.83.104504

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