Effect of Hydrostatic Pressure on Geometry of Slip in Silicon Iron Single Crystals

1983 ◽  
Vol 22 ◽  
Author(s):  
A.V. Dobromyslov ◽  
G.V. Dolgikh ◽  
N.I. Talutz ◽  
V.T. Shmatov ◽  
B. I. Beresnev
Keyword(s):  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Slip Plane ◽  
Special Structure ◽  
Normal Stresses ◽  
Silicon Iron ◽  
Screw Dislocations ◽  
Effect Of Pressure ◽  
Effect Of Hydrostatic Pressure

ABSTRACTThe effect of the pressure 550MPa on the choice of the acting slip plane in the single crystals of Fe−2,9%Si was studied. It was established that the presence of pressure resulted in the increase of the slip asymmetry. The effect of pressure is attributed to the action of normal stresses and to the special structure of screw dislocations.

scholarly journals Pressure effect on the electrical resistance of Y0.77Pr0.23Ba2Cu3O7-δ single crystals

2020 ◽  
Keyword(s):  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Electrical Resistance ◽  
Simultaneous Increase ◽  
Critical Temperatures ◽  
Electron Phonon Interaction ◽  
The Matrix ◽  
Critical Temperature Tc ◽  
Effect Of Hydrostatic Pressure

The effect of hydrostatic pressure up to 12 kbar on the electrical resistance in the basal ab-plane of optimally oxygen-doped (δ<0.1) single crystals Y1–xPrxBa2Cu3O7–δ moderately doped with praseodymium (x≈0.23) with a critical temperature Tc≈67 K. Compared to undoped single-crystal YBa2Cu3O7–δ, doping with praseodymium led to a decrease in the critical temperature by ≈24 K with a simultaneous increase in ρab (300 K) by ≈130 μΩcm. In the region of the transition to the superconducting state, several clearly pronounced peaks are observed on the dρ/dT – T curves, which indicates the presence of several phases with different critical temperatures in the sample. The application of high hydrostatic pressure leads to an increase in Tc by about 3 K. This increase slows down with increasing pressure, and the baric derivatives, dTc/dP, decrease from 0.44 K/kbar at atmospheric pressure to 0.14 K/kbar at 11 kbar. The comparatively weak change in the critical temperature under the action of hydrostatic pressure is due to the relatively small value of the orthorhombic distortion, (a–b)/a. The change in the baric derivative dTc/dP upon all-round compression of the sample is due to the fact that, along with an increase in the Debye temperature, the matrix element of the electron-phonon interaction also increases. Possible mechanisms of the effect of high pressure on Tc are discussed taking into account the presence of features in the electronic spectrum of carriers.

scholarly journals Effect of Hydrostatic Pressure on Velocity of Shear Deformation of Single Ice Crystals

1958 ◽  
Vol 3 (24) ◽  
pp. 271-278 ◽  
Author(s):  
George P. Rigsby
Keyword(s):  
Hydrostatic Pressure ◽  
Strain Rate ◽  
Shear Strain ◽  
Single Crystals ◽  
Shear Deformation ◽  
Melting Temperature ◽  
Ice Crystals ◽  
Shear Strain Rate ◽  
The Difference ◽  
Effect Of Hydrostatic Pressure

Apparatus was built for deforming ice crystals under hydrostatic pressures up to 350 atmospheres. Single crystals were placed in the mounts in such a way that the deformation occurred by gliding on the basal glide plane. It was found that the shear strain rate increased as the pressure was increased at constant temperature, but that the rate is practically independent of hydrostatic pressure when the difference between the ice temperature and the melting temperature is kept constant.

scholarly journals Peculiarities of pseudogap in Y0.95Pr0.05Ba2Cu3O7−δ single crystals under pressure up to 1.7 GPa

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
A. L. Solovjov ◽  
L. V. Omelchenko ◽  
E. V. Petrenko ◽  
R. V. Vovk ◽  
V. V. Khotkevych ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystal ◽  
Single Crystals ◽  
Temperature Interval ◽  
Fluctuation Theory ◽  
Structural Defects ◽  
Fluctuation Conductivity ◽  
First Time ◽  
Effect Of Hydrostatic Pressure

AbstractThe effect of hydrostatic pressure up to P = 1.7 GPa on the fluctuation conductivity σ′(T) and pseudogap ∆*(T) in Y0.95Pr0.05Ba2Cu3O7−δ single crystal with critical temperature Тс = 85.2 K (at P = 0) was investigated. The application of pressure leads to the increase in Tc with dTc/dP = +1.82 K∙GPa−1 while the resistance decreases as dlnρ(100 K)/dP = −(10.5 ± 0.2) %∙GPa−1. Regardless of the pressure, in the temperature interval from Tc to T0 (~88 K at P = 0) the behaviour of σ′(T) is well described by the Aslamazov – Larkin (AL – 3D) fluctuation theory, and above the T0 by the Lawrence – Doniach theory (LD). The Maki-Thompson (MT – 2D) fluctuation contribution is not observed. This indicates the presence of structural defects in the sample induced by Pr. Here it is determined for the first time that when the pressure is applied to the Y1−xPrxBa2Cu3O7−δ single crystal, the pseudogap increases as dlnΔ*/dP = 0.17 GPa–1.

EFFECT OF PRESSURE ON INTERLAYER COUPLING AND SUPERCONDUCTING TRANSITION TEMPERATURE OF Bi-2201 AND Bi-2212

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3744-3746 ◽  
Author(s):  
AUGUST YURGENS ◽  
DAG WINKLER ◽  
TORD CLAESON ◽  
TAKASHI MURAYAMA ◽  
YOICHI ANDO
Keyword(s):  
Transition Temperature ◽  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Critical Current ◽  
Superconducting Transition Temperature ◽  
Interlayer Coupling ◽  
Superconducting Transition ◽  
Effect Of Pressure

We used the hydrostatic pressure P<1 GPa as a tool to change the c-axis interlayer coupling of Bi 2 Sr 1.5 La 0.5 CuO 6+δ (Bi-2201) and Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) single crystals. The c-axis critical current, as a measure of the interlayer coupling, drastically increases with pressure (up to 270% GPa -1). The superconducting critical temperature, on the contrary, only slightly increases with a rate of ≈ 2 - 6% GPa -1, This implies that the CuO-interlayer coupling has little effect on Tc in Bi-2201.

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