CRYSTAL GROWTH OF MULTI-LAYERED Ba2Ca4Cu5O10(O,F)2 (F-0245) SUPERCONDUCTOR UNDER HIGH PRESSURE

Single crystals of multi-layered Ba 2 Ca 4 Cu 5 O 10( O , F )2 superconductor(F-0245) have been grown under a high pressure of 4.5 GPa . Single crystals with in-plane length of 500μm were typically obtained and flat shiny areas with more than 1 mm 2 were also observed on the surface of fractured samples. Tc values for these samples were determined by electrical resistivity measurements. These values were found to change from 70 K to 85 K by change of oxygen and fluorine contents in the starting mixture. The temperature dependence of resistivity showed characteristic of under-doped cuprate superconductors.

Download Full-text

Influence of high pressure on the temperature dependence of electrical resistivity of Y1-xPrxBa2Cu3O7-δ single crystals

Solid State Communications ◽

10.1016/j.ssc.2021.114205 ◽

2021 ◽

Vol 327 ◽

pp. 114205

Author(s):

G. Ya Khadzhaj ◽

A.V. Matsepulin ◽

A. Chroneos ◽

Ι.L. Goulatis ◽

R.V. Vovk

Keyword(s):

High Pressure ◽

Electrical Resistivity ◽

Temperature Dependence ◽

Single Crystals

Download Full-text

Single Crystal Growth and Physical Properties of Pyroxene CoGeO3

Crystals ◽

10.3390/cryst11040378 ◽

2021 ◽

Vol 11 (4) ◽

pp. 378

Author(s):

Li Zhao ◽

Zhiwei Hu ◽

Hanjie Guo ◽

Christoph Geibel ◽

Hong-Ji Lin ◽

...

Keyword(s):

High Pressure ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

Crystal Growth ◽

Physical Properties ◽

Single Crystal ◽

Single Crystals ◽

Magnetic Moments ◽

Single Crystal Growth ◽

The Impact

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

Download Full-text

The effects of sulfuric acid on the creep, recrystallization, and electrical properties of ice

Canadian Journal of Physics ◽

10.1139/p02-130 ◽

2003 ◽

Vol 81 (1-2) ◽

pp. 395-400 ◽

Cited By ~ 6

Author(s):

D Iliescu ◽

I Baker ◽

X Li

Keyword(s):

Electrical Resistivity ◽

Sulfuric Acid ◽

Single Crystals ◽

Equal Channel Angular Extrusion ◽

Boundary Migration ◽

Constant Load ◽

Tensile Creep ◽

Grain Boundary Migration ◽

Resistivity Measurements ◽

Lower Resistivity

Both constant load creep and recrystallization are investigated using single crystals of 70170 ppb sulfuric-acid-doped and -undoped ice. Both sets of crystals exhibited strains in excess of 200% under tensile creep. The undoped specimens reached these strains roughly twice as fast as the doped specimens. After large local strains were imparted to cuboidal single crystals using equal channel angular extrusion at 2°C and subsequent annealing at the same temperature, recrystallization occurred. It was found that a higher concentration of H2SO4 retarded both recrystallization and the subsequent grain-boundary migration. Direct current electrical resistivity measurements performed on polycrystalline, sulfuric-acid-doped (3 ppm) ice at 10°C showed a much lower resistivity in the grain boundaries than in the lattice. PACS No.: 81.90

Download Full-text

Effect of high pressure on various diffusion mechanisms in oxygen-deficient ReBa2Cu3O7−x (Re = Y, Ho) single crystals

Modern Physics Letters B ◽

10.1142/s0217984919500398 ◽

2019 ◽

Vol 33 (04) ◽

pp. 1950039

Author(s):

G. Ya. Khadzhai ◽

N. R. Vovk ◽

R. V. Vovk ◽

I. L. Goulatis ◽

O. V. Dobrovolskiy

Keyword(s):

High Pressure ◽

Electrical Resistivity ◽

Hydrostatic Pressure ◽

Single Crystals ◽

High Hydrostatic Pressure ◽

Room Temperature ◽

Diffusion Mechanisms ◽

Diffusion Coalescence

The effect of high hydrostatic pressure on the relaxation of the electrical resistivity at room temperature of oxygen-nonstoichiometric [Formula: see text] (Re = Y, Ho) single crystals is investigated. The application of hydrostatic pressure has been revealed to significantly intensify the process of diffusion coalescence in the oxygen subsystem. At the same time, the intensity of the redistribution of labile oxygen is significantly changed when yttrium is replaced by holmium.

Download Full-text