Laser-diode-heated floating zone (LDFZ) method appropriate to crystal growth of incongruently melting materials

Abstract

We have developed the laser-diode-heated floating zone (LDFZ) method, in order to improve the broad and inhomogeneous light focusing in the conventional lamp-heated floating zone method, which often causes difficulties in the crystal growth especially for the incongruently melting materials. We have simulated the light focusing properties of the LDFZ method to make irradiated light homogeneous and restricted mostly to the molten zone. We have designed and assembled an LDFZ furnace, and have demonstrated how it works through actual crystal growth. The method is applicable to various kinds of materials, and enables stable and reproducible crystal growth even for the incongruently melting materials. We have succeeded in the crystal growth of representative incongruently melting materials such as BiFeO3 and (La,Ba)2CuO4, which are difficult to grow by the conventional method. Tolerance to the decentering of the sample and highly efficient heating are also established in the LDFZ method.

29 pages, 7 figures, to appear in J. Cryst. Growth

References in corpus (3)

• The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition
• Stripe order, depinning, and fluctuations in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ and La${}_{1.875}$Ba${}_{0.075}$Sr${}_{0.050}$CuO${}_4$
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• Challenges in the crystal growth of Li2FeSiO4
• Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba${}_2$Cu${}_3$O${}_4$Cl${}_2$
• Two Superconducting Transitions in Single Crystal La${}_{2-x}$Ba${}_x$CuO${}_4$
• Ferroelectricity in underdoped La-based cuprates
• Multiple Broken Symmetries in Striped La${}_{2-x}$Ba${}_x$CuO${}_4$ detected by the Field Symmetric Nernst Effect