Growth, Faraday and inverse Faraday characteristics of Tb_2Ti_2O_7 crystal

Guo, Feiyun; Sun, Yilin; Yang, Xiongsheng; Chen, Xin; Zhao, Baozhen; Zhuang, Naifeng; Chen, Jianzhong

doi:10.1364/oe.24.005734

Cited by 17 publications

(6 citation statements)

References 36 publications

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“…For this prior work, disc-shaped crystals with diameters of 30 mm and several millimeter in length were grown. Crystals with pronounced {111} facets were also reported recently by Guo et al 7 . They demonstrated crystals with diameter and length of about 20 mm and 16 mm, respectively.…”

Section: Introductionsupporting

confidence: 69%

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

et al. 2017

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Terbium titanate (Tb 2 Ti 2 O 7 ) is a spin-ice material with remarkable magneto-optical properties. It has a high Verdet constant and is a promising substrate crystal for the epitaxy of quantum materials with the pyrochlore structure. Large single crystals with adequate quality of Tb 2 Ti 2 O 7 or any pyrochlore are not available so far. Here we report the growth of high-quality bulk crystals using the Czochralski method to pull crystals from the melt. Prior work using the automated Czochralski method has suffered from growth instabilities like diameter fluctuation, foot formation and subsequent spiraling shortly after the seeding stage. In this study, the volumes of the crystals were strongly increased to several cubic centimeters by means of manual growth control, leading to crystal diameters up to 40 mm and crystal lengths up to 10 mm. Rocking curve measurements revealed full width at half maximum values between 28 and 40 ′′ for 222 reflections. The specific heat capacity c p was measured between room temperature and 1573 K by dynamic differential scanning calorimetry and shows the typical slow parabolic rise. In contrast, the thermal conductivity κ(T ) shows a minimum near 700 K and increases at higher temperature T . Optical spectroscopy was performed at room temperature from the ultraviolet to the near infrared region, and additionally in the near infrared region up to 1623 K. The optical transmission properties and the crystal color are interpreted to be influenced by partial oxidation of Tb 3+ to Tb 4+ .

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Section: Introductionsupporting

confidence: 69%

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

et al. 2017

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“…where g is the Landé factor, µ B the Bohr magneton, c the velocity of light, h the Planck constant, n the refraction index (it can be estimated by the transmittance of crystal [4]), χ the volume magnetic susceptibility and C t the transition probability. The terms n, χ and C t are functions of temperature, and when the temperature is constant, could be considered as a constant, so the inverse of Verdet constant is in linear relationship with proportional to the wavelength square.…”

Section: Faraday Rotationmentioning

confidence: 99%

“…Paramagnetic magneto-optical materials containing rare earth ions (such as Tb 3+ , Eu 2+ and Ce 3+ ) are suitable for use in this band, although their Verdet constants are smaller than those of doped YIG. As is known, crystals [3][4][5][6], glasses [7][8][9] and ceramics [10,11] containing Tb 3+ ions have been extensively investigated as Faraday rotator materials due to its good magneto-optic effect in the visible and near-infrared bands and relatively easy preparation process. However, at the present, the crystals containing Ce 3+ ions have drawn people's attention [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Czochralski Growth, Magnetic Properties and Faraday Characteristics of CeAlO3 Crystals

Guo

Zhang

et al. 2019

Crystals

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CeAlO3 crystals were grown in different growth atmospheres by the Czochralski method. The lattice parameters and space group of CeAlO3 crystal were determined by Rietveld structure refinement of X-ray diffraction (XRD) data. The influence of Ce4+ ions in the crystal on the transmittance and crystal color was confirmed by XPS analysis. Magnetization curve at room temperature and temperature dependencies of the magnetic susceptibility in two different directions were measured, indicating that CeAlO3 crystal has remarkable magnetic anisotropy and there is an abnormal magnetic behavior in the vertical <001> direction in the temperature range of 50–150 K. Faraday characteristics of CeAlO3 crystal were investigated at room temperature. Verdet constants of CeAlO3 at 532, 635 and 1064 nm are about 2.1 times as large as those of CeF3. The reason of large Verdet constants was analyzed based on the Van Vleck–Hebb theory and the magnetic circular dichroism (MCD) spectrum.

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“…By using the ceramics with the highest Verdet constant, the length can be shortened to 5.1 mm to obtain a 45° Faraday rotation angle under 1 T of magnetic field, suggesting that the Faraday rotator device can be manufactured with a very compact size, whereas a commercial TGG crystal requires a length of about 20 mm. As seen in Figure 5b, TYO ceramics with a Bixbyite structure showed very high Verdet constants against Tb concentration (i.e., Tb ion number/total cation number) compared to other Faraday rotator materials such as TGG [13], TSAG [16], TAG [19], NTF (Na 0.37 Tb 0.63 F 2.26 ) [14,15], KTF (KTb 3 F 10 ) [20], and TTO (Tb 2 Ti 2 O 7 ) [21].…”

Section: Resultsmentioning

confidence: 99%

Total Performance of Magneto-Optical Ceramics with a Bixbyite Structure

Ikesue¹,

Aung²,

Makikawa

et al. 2019

Materials

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High-quality magneto-optical ceramics (TbxY1−x)2O3 (x = 0.5–1.0) with a Bixbyite structure were extensively investigated for the first time. The total performances of these ceramics were far superior to those of commercial TGG (Tb3Ga5O12) crystal, which is regarded as the highest class of Faraday rotator material. In particular, the Verdet constant of Tb2O3 (when x = 1.0) ceramic was the largest—495 to 154 rad·T−1·m−1 in the wavelength range of 633 to 1064 nm, respectively. It was possible to further minimize the Faraday isolator device. The insertion loss of this ceramic was equivalent to that of the commercial TGG single crystal (0.04 dB), and its extinction ratio reached more than 42 dB, which is higher than the value for TGG crystal (35 dB). The thermal lens effect (1/f) was as small as 0.40 m−1 as measured by a 50 W fiber laser. The laser damage threshold of this ceramic was 18 J/cm2, which is 1.8 times larger than that of TGG, and it was not damaged during a power handling test using a pulsed laser (pulse width 50 ps, power density 78 MW/cm2) irradiated at 2 MHz for 7000 h.

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Growth, Faraday and inverse Faraday characteristics of Tb_2Ti_2O_7 crystal

Cited by 17 publications

References 36 publications

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Czochralski Growth, Magnetic Properties and Faraday Characteristics of CeAlO3 Crystals

Total Performance of Magneto-Optical Ceramics with a Bixbyite Structure

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Growth, Faraday and inverse Faraday characteristics of Tb_2Ti_2O_7 crystal

Cited by 17 publications

References 36 publications

Crystal growth and characterization of the pyrochlore Tb2Ti2O7

Crystal growth and characterization of the pyrochlore Tb2Ti2O7

Czochralski Growth, Magnetic Properties and Faraday Characteristics of CeAlO3 Crystals

Total Performance of Magneto-Optical Ceramics with a Bixbyite Structure

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Product

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Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇