scholarly journals Crystal Growth by the Floating Zone Method of Ce-Substituted Crystals of the Topological Kondo Insulator SmB6

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 827
Author(s):  
Monica Ciomaga Hatnean ◽  
Talha Ahmad ◽  
Marc Walker ◽  
Martin R. Lees ◽  
Geetha Balakrishnan
Keyword(s):  
Crystal Growth ◽  
Parent Compound ◽  
Magnetic Ordering ◽  
Composition Analysis ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Kondo Insulator ◽  
Floating Zone Method ◽  
X Ray

SmB6 is a mixed valence topological Kondo insulator. To investigate the effect of substituting Sm with magnetic Ce ions on the physical properties of samarium hexaboride, Ce-substituted SmB6 crystals were grown by the floating zone method for the first time as large, good quality single crystal boules. The crystal growth conditions are reported. Structural, magnetic and transport properties of single crystals of Sm1−xCexB6 (x=0.05, 0.10 and 0.20) were investigated using X-ray diffraction techniques, electrical resistivity and magnetisation measurements. Phase composition analysis of the powder X-ray diffraction data collected on the as-grown boules revealed that the main phase was that of the parent compound, SmB6. Substitution of Sm ions with magnetic Ce ions does not lead to long-range magnetic ordering in the Sm1−xCexB6 crystals. The substitution with 5% Ce and above suppresses the cross-over from bulk conductivity at high temperatures to surface-only conductivity at low temperatures.

Effect of Temperature on La1.85Sr0.15CuO4 Single Crystal Growth by Floating Zone Method

2007 ◽  
Vol 546-549 ◽  
pp. 1897-1900 ◽  
Author(s):  
X.Q. Xiang ◽  
J.F. Qu ◽  
Y.Q. Zhang ◽  
X.L. Lu ◽  
X.G. Li
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Effect Of Temperature ◽  
Superconducting Transition ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Higher Temperature

Superconducting single crystals of La1.85Sr0.15CuO4 have been grown at various temperatures without single crystal seeds by the traveling-solvent floating-zone method. In order to avoid the formation of bubbles during the crystal growth process, a flowing atmosphere of 2 atm oxygen or 1 atm air was applied in different temperature range. It was found that the crystal quality could be improved by raising the growth temperature in a certain range, and the orientation changed from (110) to (100) at higher temperature. X-ray diffraction results showed that the full-width at half-maximum of the best as-prepared crystal was 0.086°. The crystals grown in 2 atm oxygen showed a superconducting transition temperature (Tc) of 37.3 K, while the crystals grown in floating air showed a Tc of about 35 K and it could be improved to 36.5 K by annealing in flowing oxygen.

LFZ growth of (Bi, Pb)–Sr–Ca–Cu–O superconducting fibers

1991 ◽  
Vol 6 (4) ◽  
pp. 699-703 ◽  
Author(s):  
G.F. de la Fuente ◽  
R. Navarro ◽  
F. Lera ◽  
C. Rillo ◽  
J. Bartolomé ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Growth Rates ◽  
Floating Zone ◽  
Partial Pressure Of Oxygen ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Fiber Properties ◽  
Growth Atmosphere

Powder x-ray diffraction, d.c. and a.c. susceptibilities, and SEM have been used to study (Bi1−xPbx)2Sr2Ca2Cu3O10−δ fibers grown by the Laser Floating Zone method. The well-oriented, long-grained superconductor fiber properties are shown to be highly dependent on the partial pressure of oxygen in the growth atmosphere, as well as on fiber pulling rate. Slowly grown fibers contain initially the 2212 (80 K) phase; the 2223 (110 K) phase also appears upon annealing in air. Faster growth rates result in fibers that contain a mixture of the 2212 and 2201 phases and, in this case, long annealing procedures are necessary to observe the 2223 phase.

Crystal growth and structure analysis of Sm2−xCexCuO4

2000 ◽  
Vol 15 (9) ◽  
pp. 1905-1910 ◽  
Author(s):  
H. Takeda ◽  
M. Okuno ◽  
M. Ohgaki ◽  
K. Yamashita ◽  
T. Matsumoto
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Quench Method

The phase diagram of the Sm2O3–CuO system was investigated by the combination of the differential thermal analysis and the quench method. The results showed that Sm2CuO4 incongruently melts at about 1220 °C, and that the solid Sm2CuO4 exists in equilibrium with the liquid consisting of 81–95 mol% CuO in the range of 1060–1220 °C. On the basis of the phase diagram, Sm2−xCexCuO4 single crystals were grown by the traveling solvent floating zone method. The crystal structure [space group I4/mmm, a = 3.917(1), c 4 11.899(2) Å] has been refined using single-crystal x-ray diffraction data with a precision corresponding to an R index of 0.02.

Magnetic and structural properties of Mg(Ga0.95Fe0.05)2O4 crystal grown by optical floating zone method

2020 ◽  
Vol 34 (23) ◽  
pp. 2050245
Author(s):  
Liang-Ling Wang ◽  
Nian-Qiao Liu ◽  
Xiao-Jun Cui
Keyword(s):  
Quantum Interference ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Force Microscopy ◽  
Increasing Temperature

The crystal structure and magnetic properties of [Formula: see text] grown by optical floating zone method have been studied. The chemical composition and element ratio in the crystal were analyzed by energy dispersive X-ray spectroscopy (EDS). The results of X-ray diffraction and Raman spectra of the crystal reveal that it has a spinel structure with high crystallinity and purity. The magnetic domain period observed by using magnetic force microscopy (MFM) shows that the crystal has a stable multi-domain structure. According to the superconducting quantum interference device (SQUID) results, the magnetization increases nonlinearly with increasing magnetic field strength and approaches magnetic saturation, proving it is a paramagnetic medium. The magnetization decreases rapidly below Curie temperature and approaches stability with increasing temperature.

Structure and Properties of Ca1-xEuxMnO3 Single Crystals

2012 ◽  
Vol 190 ◽  
pp. 691-694
Author(s):  
Sergey V. Naumov ◽  
S.V. Telegin ◽  
Natalia V. Kostromitina ◽  
N.I. Solin ◽  
L.V. Elokhina ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Single Crystals ◽  
Growth Parameters ◽  
Structure And Properties ◽  
Floating Zone ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Doped Manganites

The crystal growth of electron-doped manganites Ca1-xEuxMnO3by the floating zone method is reported. The special features of the growth parameters are discussed. Results of x-ray analysis, magnetic and transport characteristics are shown.

scholarly journals Single-Crystal Growth of Sr2RuO4 by the Floating-Zone Method Using an Infrared Image Furnace with Improved Halogen Lamps

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 392
Author(s):  
Naoki Kikugawa ◽  
Dmitry A. Sokolov ◽  
Tohru Nagasawa ◽  
Andrew P. Mackenzie
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Infrared Image ◽  
Single Crystal Growth ◽  
Molten Zone ◽  
Floating Zone ◽  
Unconventional Superconductor ◽  
Zone Method ◽  
Floating Zone Method ◽  
Halogen Lamps

We report the single-crystal growth of the unconventional superconductor Sr2RuO4, on which research has reached a turning point recently. In order to optimize the quality of crystals grown by the floating-zone method using an infrared image furnace, we focus on an improvement of the structure of the filament in the halogen lamps. By reducing the thickness of the total filament, the form of the molten zone was narrowed. More importantly, the molten zone was observed to be more stable during the growth process. Finally, we obtained the crystals with a length of 12 cm. Additionally, the grown crystal has high quality, displaying the 1.5 K transition temperature expected only for the purest crystals. We also discuss the availability of the newly developed halogen lamps.

scholarly journals Single crystal growth of apatite-type Al-doped neodymium silicates by the floating zone method

2011 ◽  
Vol 333 (1) ◽  
pp. 70-73 ◽  
Author(s):  
Tao An ◽  
Tom Baikie ◽  
Fengxia Wei ◽  
Henan Li ◽  
Frank Brink ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystal Growth ◽  
Floating Zone ◽  
Zone Method ◽  
Floating Zone Method ◽  
Apatite Type

Single crystal growth of GdB6 by the optical floating-zone technique

CrystEngComm ◽  
2020 ◽  
Vol 22 (47) ◽  
pp. 8236-8242
Author(s):  
Shu-yu Ning ◽  
Xinyu Yang ◽  
Yan Wang ◽  
Zhongwen Zhu ◽  
Jiuxing Zhang
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystal Growth ◽  
Molten Zone ◽  
Floating Zone ◽  
Zone Method ◽  
High Quality ◽  
Floating Zone Method

A high-quality and large-sized GdB6 single crystal was successfully prepared by using the optical floating zone method to accurately control the temperature and composition of the molten zone.

Sign in / Sign up

Export Citation Format

Share Document