Pressure Effects on Transport Properties of (La0.85Sr0.15)yMnO3 Single Crystals

2015 ◽  
Vol 233-234 ◽  
pp. 273-276
Author(s):  
Aleksandr Shakin ◽  
Denis Abashev ◽  
Dmitry Shulyatev ◽  
Roman Privezentsev ◽  
Nikolay Andreev ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Transport Properties ◽  
Single Crystals ◽  
Vacancy Concentration ◽  
Charge Ordering ◽  
Pressure Effects ◽  
External Hydrostatic Pressure ◽  
Insulator Metal Transition ◽  
Mn Concentration

We have studied single crystals with same La/Sr ratio but different initial Mn concentration, namely (La0.85Sr0.15)0.93MnO3and (La0.85Sr0.15)0.97MnO3. We have observed, that the temperature of insulator-metal transition TIMincreases for both samples and the temperature of charge ordering TCOincreases for (La0.85Sr0.15)0.93MnO3and decreases for (La0.85Sr0.15)0.97MnO3with the external hydrostatic pressure in the range of 0.1 MPa - 1.3 GPa. After analysis of obtained dependence, we have concluded that (La0.85Sr0.15)0.97MnO3sample has higher concentration of Mn vacancy. Thereby we suppose that growth of Mn vacancy concentration decreases transfer interaction of the conducting electrons and enhances charge ordering of Mn3+and Mn4+ions.

Pressure effects on the transport properties of Ln2−xCexCuO4(Ln=Pr, Nd, Sm, Gd) single crystals

1991 ◽  
Vol 185-189 ◽  
pp. 1325-1326
Author(s):  
Akiyuki Matsushita ◽  
Shinya Uji ◽  
Takehiko Matsumoto
Keyword(s):  
Transport Properties ◽  
Single Crystals ◽  
Pressure Effects

scholarly journals Hydrostatic pressure effects on the electrical transport properties ofPr0.5Sr0.5MnO3

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
F. J. Rueckert ◽  
M. Steiger ◽  
B. K. Davis ◽  
T. Huynh ◽  
J. J. Neumeier ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Transport Properties ◽  
Electrical Transport ◽  
Pressure Effects ◽  
Electrical Transport Properties

scholarly journals Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7−δ single crystals

2016 ◽  
Vol 493 ◽  
pp. 58-67 ◽  
Author(s):  
A.L. Solovjov ◽  
L.V. Omelchenko ◽  
R.V. Vovk ◽  
O.V. Dobrovolskiy ◽  
Z.F. Nazyrov ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Pressure Effects

Non-hydrostatic pressure-dependent structural and transport properties of BiCuSeO and BiCuSO single crystals

2020 ◽  
Vol 33 (10) ◽  
pp. 105702
Author(s):  
Yang-Yang Lv ◽  
Yonghui Zhou ◽  
Lu Xu ◽  
Yecheng Luo ◽  
Yan-Yan Zhang ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Transport Properties ◽  
Single Crystals

scholarly journals Uniaxial and hydrostatic pressure effects in α-RuCl3 single crystals via thermal-expansion measurements

2018 ◽  
Vol 30 (38) ◽  
pp. 385702 ◽  
Author(s):  
Mingquan He ◽  
Xiao Wang ◽  
Liran Wang ◽  
Frédéric Hardy ◽  
Thomas Wolf ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Pressure Effects

scholarly journals DIFFUSION NUCLEATION OF CAVITIES IN GRAIN JUNCTIONS OF SUBMICROCRYSTALLINE MATERIALS

2021 ◽  
Vol 83 (3) ◽  
pp. 276-284
Author(s):  
A.S. Pupynin ◽  
S.V. Kirikov ◽  
V.N. Perevezentsev
Keyword(s):  
Plastic Deformation ◽  
Hydrostatic Pressure ◽  
High Pressure Torsion ◽  
Vacancy Concentration ◽  
Triple Junctions ◽  
External Hydrostatic Pressure ◽  
Tensile Stresses ◽  
Boundary Triple ◽  
Junction Disclinations ◽  
Submicrocrystalline Materials

The conditions of diffusional cavity nucleation in submicrocrystalline materials processed by the methods of intensive plastic deformation (equal-channel angular pressing, multiaxial forging, high pressure torsion, etc.) are analyzed. To date, the question of the mechanism of nucleation of cavities in such materials remains debatable due to the fact that the processing of materials by the methods of intensive plastic deformation is carried out at high hydrostatic pressures that prevent the appearance of pores. The possibility of diffusive nucleation of nanopores in the region of triple junctions of grains containing negative strain-induced wedge disclinations, generating high tensile stresses in the vicinity of triple junctions, comparable in magnitude to external hydrostatic pressure, is shown. Such junction disclinations inevitably occur at the grain junctions due to the heterogeneity of the plastic deformation through the ensemble of polycrystal grains. It is shown that an important condition for the nucleation of cavities is not only the presence of high internal tensile stresses from junction disclinations, but also an extremely high concentration of nonequilibrium strain-induced vacancies characteristic of submicrocrystalline metals, comparable in values to the vacancy concentration, at temperatures close to solidus. The influence of the strength of junction disclinations, the value of external hydrostatic pressure and the degree of supersaturation of the material by nonequilibriumstrain-induced vacancies on the rate of diffusional nucleation and the volume of critical pore nuclei is analyzed. It is established that in order to effectively suppress the process of pore formation in the grain boundary triple junctions, it is necessary to apply an external hydrostatic pressure that compensates for internal elastic fields from junction disclinations.

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