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

Ito, T.; Ushiyama, T.; Yanagisawa, Y.; Tomioka, Y.; Shindo, Isamu; Yanase, Atsushi

doi:10.1016/j.jcrysgro.2012.10.059

Cited by 46 publications

(53 citation statements)

References 9 publications

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“…Single crystals of BaSrCo 2 Fe 11 AlO 22 of nominal composition were grown by the traveling solvent floating zone method under 10 atm of pure oxygen with use of the laser floating zone furnace (SC1-LD200x5, Canon Machinery Inc.). The floating zone furnace used in this study was similar to that reported by Ito et al 27 , but equipped with five laser diodes. The maximum power of each laser diode was 200 W. Sintered polycrystalline rods of nominal composition were used as both feed and seed rods in the first growth, while the grown single crystal was used as a seed rod for the next growth.…”

Section: Methodsmentioning

confidence: 90%

Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22

et al. 2016

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We have investigated magnetic orders and excitations in a Y-type hexaferrite BaSrCo 2 Fe 11 AlO 22 (BSCoFAO), which was reported to exhibit spin-driven ferroelectricity at room temperature [Hirose et al., Appl. Phys. Lett. 104, 022907 (2014)]. By means of magnetization, electric polarization and neutron diffraction measurements using single-crystal samples, we establish H-T magnetic phase diagram for magnetic field perpendicular to the c axis (H ⊥c). This system exhibits an alternating longitudinal conical (ALC) magnetic structure in the ground state, and it turns into a non-coplanar commensurate magnetic order with spin-driven ferroelectricity under H ⊥c. The field-induced ferroelectric phase remains as a metastable state after removing magnetic field below ∼ 250 K. This metastability is the key to understanding of magnetic-field-reversal of the spin-driven electric polarization in this system. Inelastic polarized neutron scattering measurements in the ALC phase reveal a magnetic excitation at around 7.5 meV, which is attributed to spin components oscillating in a plane perpendicular to the cone axis. This phason-like excitation is expected to be electric-field-active magnon, i.e., electromagnon excitation, in terms of the magnetostriction mechanism.

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Section: Methodsmentioning

confidence: 90%

Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22

et al. 2016

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“…Single crystals of La 2−x Ba x CuO 4 (near x = 1/8) were grown using the recently developed laser-diode-heated floating zone method, which enables an exceptionally high degree of sample homogeneity [24]. The samples were cut along the crystal axes into rectangular bars for a − b plane transport measurements.…”

Section: B Methods and Resultsmentioning

confidence: 99%

“…Multiple Broken Symmetries in Striped La 2−x Ba x CuO 4 detected by the Field Symmetric Nernst Effect S I. SAMPLE PREPARATION Single crystals of La 2−x Ba x CuO 4 (near x = 1/8) were grown using the recently developed laser-diode-heated floating zone method, which enables an exceptionally high degree of sample homogeneity, as shown by the absence of impurity phases in Laue and x-ray diffraction measurements [24]. The samples were cut along the crystal axes into rectangular bars for a − b plane transport measurements, with typical dimensions of 3.0 × 0.5 × 0.5 mm for in-plane resistivity (ρ xx ) measurements and 3.0 × 1.5 × 0.5 mm for thermoelectric and Hall measurements .…”

Section: Supplementary Materials Formentioning

confidence: 99%

Multiple broken symmetries in stripedLa2−xBaxCuO4detected by the field-symmetric Nernst effect

et al. 2016

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We report on a thermoelectric investigation of the stripe and superconducting phases of the cuprate La2−xBaxCuO4 near the x = 1/8 doping known to host stable stripes. We use the doping and magnetic field dependence of field-symmetric Nernst effect features to delineate the phenomenology of these phases. Our measurements are consistent with prior reports of time-reversal symmetry breaking signatures above the superconducting Tc, and crucially detect a sharp, robust, field-invariant peak at the stripe charge order temperature, TCO. Our observations suggest the onset of a nontrivial charge ordered phase at TCO, and the subsequent presence of spontaneously generated vortices over a broad temperature range before the emergence of bulk superconductivity in LBCO.

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“…However, the conventional FZ method is difficult to apply to refractory materials with a high melting temperature, volatile materials or incongruent materials. To partly overcome this difficulty, the FZ method using a diode laser, referred to as the LFZ method hereafter, has recently been proposed [5]. This LFZ instrument, composed of seven diode lasers with each power of 50W, has successfully shown many advantageous properties over the conventional halogen lamp or xenon lamp FZ method.…”

Section: Introductionmentioning

confidence: 99%

Floating zone furnace equipped with a high power laser of 1 kW composed of five smart beams

Tokura

2020

Journal of Crystal Growth

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A floating zone furnace is a powerful tool for single crystal growth. Here, we report the floating zone furnace using a high power diode laser of 1kW composed of five 200 Watt heating beams. The five beams with the designed irradiation intensity distribution enable the melt-growth of single crystals for refractory materials having a high melting temperature above 2000°C, volatile materials and even incongruent materials. The power of five beams in the horizontal plane provides uniform intensity in the outer circumference of the raw material rods, while the vertical direction power of five beams can be made to have a bell shape irradiation intensity so as to relax residual thermal stress in the grown single crystal. The present furnace enables one to directly monitor the temperature of the hot spot of raw material and the molten zone within a 1 mm diameter. Such an in-situ monitoring function of the temperature on the molten zone greatly enhances the controllability for optimizing the crystal growth condition.Ha(Y) on the Y-axis is measured by moving the thermocouple on the Y-axis direction. The obtained Ha(Y) on the Y-axis has a gaussian shape. The position at 10% of the maximum intensity of the halogen lamp in the Y direction is ±25mm from the center at Y-axis. The Ha(X) along the X-axis is the same as the Ha(Y) along the Y-axis. The green dashed line is calculated by assuming the four irradiation light beams with the same Ha(X). With a confocal elliptical mirror in the case of using two halogen lamps, the uniformity will be even worse, less than 50%. On the other hand, the red solid line in Fig. 3, which was calculated and reported also by Ito et al.[5], shows irradiation intensity distribution in the azimuthal direction of the raw material rod in both cases of type A with a flat shape and type B with a gaussian shape in the case of using LFZ. In this case, high uniformity of 95% or more can be ensured over 360° around the raw material rod. For the actual crystal growth procedure in

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

Cited by 46 publications

References 9 publications

Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22

Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22

Multiple broken symmetries in stripedLa2−xBaxCuO4detected by the field-symmetric Nernst effect

Floating zone furnace equipped with a high power laser of 1 kW composed of five smart beams

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