High-pressure floating zone crystal growth of Sr${}_2$IrO${}_4$

Abstract

Here we demonstrate the floating zone crystal growth of the $J_{\mathrm{eff}}=1/2$ Mott insulator Sr${}_2$IrO${}_4$. Historically, the growth of iridates from a ternary melt has been precluded by the extreme vapor pressure of the metal oxide species and the difficulty of maintaining the correct oxidation state of Ir at high temperatures. Here, we show that the application of a high-pressure oxygen growth environment stabilizes the Sr${}_2$IrO${}_4$ phase, leading to the first demonstration of cm${}^3$-scale crystals. In contrast to the conventional SrCl${}_2$ flux growth method, where poor control over disorder leads to strong sample dependence, the high-pressure floating zone growth enables active control over the homogeneity of the melt. Crystals grown via this technique possess qualitatively similar properties to those grown via flux, with a relatively sharp onset of antiferromagnetic order observed in temperature-dependent magnetization. Further, we demonstrate that by tuning the mixing rate of the melt, we are able to grow natively hole-doped Sr${}_2$Ir${}_{1-y}$O${}_4$, which exhibits a strongly modified magnetic and electronic response.

9 pages, 4 figures

References in corpus (18)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5$d$ Transition Metal Oxides Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ ($n$=1, 2, and $\infty$)
• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Hyper-honeycomb iridate $\beta$-Li2IrO3 as a platform for Kitaev magnetism
• Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet
• Monte Carlo study of an unconventional superconducting phase in Ir-oxide J_{eff}=1/2 Mott insulators induced by carrier doping
• The magnetic and crystal structures of Sr2IrO4: A neutron diffraction study
• Odd-parity triplet superconductivity in multi-orbital materials with strong spin-orbit coupling: applications to doped Sr2IrO4
• Neutron scattering study of correlated phase behavior in Sr2IrO4
• A structural distortion induced magneto-elastic locking in Sr${}_2$IrO${}_4$ revealed through nonlinear optical harmonic generation
• Unidirectional spin density wave state in metallic (Sr1-xLax)2IrO4
• The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions
• High-Pressure Laser Floating Zone Furnace
• Structural evolution and electronic properties of (Sr1-xCax)2-yIrO4+z spin-orbit assisted insulators
• Single crystal growth of iridates without platinum impurities
• Advances in high-pressure laser floating zone growth: the Laser Optical Kristallmacher II
• Magneto-synthesis effect on magnetic order, phonons, and magnons in single-crystal Sr${}_2$IrO${}_4$