The oxygen isotope effect was studied in the system (${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Pr}}_{\mathit{x}}$)${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ for x=0.2, 0.3, 0.4, and 0.5. It is found that exponent \ensuremath{\alpha} increases with increasing x therefore decreasing transition temperature ${\mathit{T}}_{\mathit{c}}$. For highest Pr concentrations tends toward \ensuremath{\alpha}=0.5. value of...

We have summarized some important results of the anisotropic transport properties prototypical manganite La 1-x Ca x MnO 3 as well a few others. The temperature dependence magnetoresistance in manganites exhibits peak near magnetic ordering which differs dramatically from ones 3d ferromagnetic metals and alloys. Depending on strain-driven orbital state, AMR could be enhanced dramatically. is much larger than metals, where its magnitude only order percent. At low fields (below kG) intrinsic...

We report on studies of magnetic and transport properties, as well characterization defects in the pure ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$/Ag(10 30 wt. %) composites. The properties include diamagnetic shielding, Meissner effect, trapped field [for both zero-field-cooling (ZFC) field-cooling (FC) cases], their...

The authors investigated the anisotropic magnetoresistance (AMR) in ultrathin La-based manganite films grown on various substrates. It was found that depending strain state, AMR some of these systems exceeds 100% and can even change sign. These changes are very dramatic when compared to few percent conventional ferromagnets. mechanism behind large is discussed.

Suppose that an automobile insurance plan is characterized by a double classification. The risks are thus divided into classes, i = 1, 2, …, p (e.g. defined use of car and age operator), groups j q licence accidents during the last three years). experience company described observed “relative loss ratios” r ij some measure exposure n . A general model, often used, : s observations random variables with expected values g (α , β ), where relativities α parameters representing classes represent...

Magnetotransport properties of strained La0.65Ca0.35MnO3 thin films with thickness between 10 and 1000nm were investigated at temperatures near the metal-insulator transition in magnetic fields up to 0.7Tesla. The reduction film thickness, which turn produces an increasing epitaxial lattice strain, dramatically increases “in-plane” anisotropy magnetoresistivity.

High-temperature superconductivity was observed in the system $({\mathrm{Al}}_{x}{\mathrm{Y}}_{1\ensuremath{-}x}){\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6.5+\ensuremath{\delta}}$ for $0\ensuremath{\le}x\ensuremath{\le}0.85$. Transition temperatures at zero resistance vary between 90.6 and 50 K, are related to gradual crystal lattice changes. At $x=0.90$ a time- current-dependent is found $T<25$ K.

The effects of the grain-boundary-induced lattice disorder on resistivity, magnetization, and specific heat a prototypical manganite Sm0.55Sr0.45MnO3 near half doping were investigated at temperatures metal-insulator transition. An increasing softens magnetic phase transition from first order into second Furthermore, peaks in resistivity are broaden there is an increase charge-carrier scattering rates metallic insulating states. origin these phenomena discussed.

Temperature dependence of the critical current ${I}_{c}$ was investigated in thin films and ceramics $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}(\mathrm{YBCO})$ over a temperature range 10-90 K magnetic fields up to 700 G. The measurements were performed using superconducting rings persistent mode. A scanning axial Hall probe used record profile field across ring, generated by at level. magnitude inferred from current's self-field center...

Studies of the dependence intergrain critical currents on temperature (60--90 K) and magnetic field (0--100 G) were performed for samples ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ ceramics (YBCO) a 2-wt.% Ag-doped composite (YBCO-Ag). The measurements done using ceramic rings in persistent mode scanning cryogenic Hall probe. This technique allowed us to satisfy conditions not available studies before. A self-sustaining...

The authors studied the low-field magnetoresistance of Sm1−xSrxMnO3 (x=0.45) which was sintered at different elevated temperatures followed by fast cooling (thermal quenching). Near metal insulator transition is dramatically enhanced while magnitude and width resistive peak are significantly reduced increasing sintering/quenching temperature, approaching values observed in a single crystal same composition. They attribute these effects to an increase grain size system.

We investigated magnetotransport properties, such as the clustering temperature ${T}^{\ensuremath{\ast}}$, ${T}_{C}$, magnetoresistance, and resistivity of ${\text{Sm}}_{0.55}{\text{Sr}}_{0.45}{\text{MnO}}_{3}$ manganite (which exhibits a non-Curie-Weiss (CW) behavior, resulting from multiphase competition coexistence), their evolution due to ruthenium doping on Mn-ion site ($B$-site). These results have been compared with predictions model system two competing states in presence quenched...

CaRuO3 is a prototypical perovskite oxide among the Ruddlesden–Popper series with multi-exotic physical properties on verge of quantum criticality. Unlike case well-known ferromagnetic SrRuO3, literature system scarce no consensus about its magnetic and transport ground states. This work provides detailed study magnetotransport 300 nm epitaxial films grown single crystalline SrTiO3 LaAlO3 substrates. The electronic states in tensile strained CaRuO3/SrTiO3 compressively CaRuO3/LaAlO3 are...

The trapped flux, diamagnetic shielding, and Meissner effect in polycrystalline ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ disks have been investigated by the measurement of distribution magnetic field across sample at 77 K. measurements were performed for samples cooled zero nonzero external fields. was studied both presence an applied when this switched off. results show relationship between shielding effect, flux pinning effect. Partial creep into disk observed to occur...

Depth-controlled $\ensuremath{\beta}$-NMR was used to study highly spin-polarized $^{8}\mathrm{Li}^{+}$ in a Cu film of thickness $100\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ deposited onto MgO substrate. The positive Knight shifts and spin relaxation data show that occupies two sites at low temperatures, assigned be the substitutional $(S)$ octahedral $(O)$ interstitial sites. Between 50 $150\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, there is site change from $O$ $S$. temperature dependence...

The effect of the lattice disorder on resistivity La1−xCaxMnO3 (LCMO) near x=13 at metal-insulator transition was studied by using a percolation model. model applied to calculate temperature dependence ρ(T) mixed state, where metallic ferromagnetic and insulating paramagnetic clusters simultaneously exist. fraction phase obtained assuming Gaussian distribution random temperatures, whose width increases with an increasing disorder. calculated from reproduces well experimental ones for LCMO...

Summary The authors have studied the combined data on claims in fire insurance of dwelling houses reported 1958-1969 by Swedish companies were cleared deductibles and adjusted according to a suitable index Only losses above largest deductible (in real value) applied during observation period included. material contains four different classes resistibillty building construction For international comparisons, pure B 1 (“stone” dwellings) 4 (wooden houses) are interest distribution could be...

High-temperature superconductivity was observed in the system (${\mathit{M}}_{\mathit{x}}$${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$)${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.5+\mathrm{\ensuremath{\delta}}}$) where M = Ga, Bi, or Fe. Ga and Fe substituted for Y reduce orthorhombic distortion ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.5+\mathrm{\ensuremath{\delta}}}$ tetragonal lattice. The changes transition temperature at zero resistance are not related to...

Elastic and crystallographic properties of superconducting whiskers Bi 2 Sr Ca 1 Cu O x with a transition temperature near 76 K are given. The can be elastically deformed up to strains between 3%. Crystallographically the identical. growth direction is along -axis. modulated b -axis lies in their flat side, c perpendicular this side. Unit cell dimensions =5.39 Å, =5.38 =30.0 show damped electron energy loss peak 19 eV, identified as volume valence plasmon.

Magnetic phase transition in the manganite films has been found to be induced by structural of ${\text{SrTiO}}_{3}$ substrate at ${T}_{s}=105\text{ }\text{K}$ [Vlasko-Vlasov et al., Phys. Rev. Lett. 84, 2239 (2000) and Ziese New J. 10, 063024 (2008)]. However, no change electrical transport properties detected this temperature. Here we report observation satellite peaks temperature dependence coefficient resistivity (TCR) temperatures around 105 K ultrathin grown on substrates, triggered...

Magneto-resistive anisotropy (AMR) has been studied in 45 nm thick La0.7−xPrxCa0.3MnO3 (LPCMO) manganite films (with Pr doping x between 0 and 0.40) deposited on LaAlO3 (LAO) SrTiO3 (STO) substrates. The AMR compressively strained undergoes a sign change from positive to negative at low temperatures, whereas its does not subjected tensile strain. Temperature dependence of magnetization magnetic field applied parallel perpendicular the (100)-plane shows that temperatures strain-induced...

Josephson- (intergrain-) flux depinning was studied in a Josephson-junction network of granular YBCO and YBCO/Ag superconductors. We measured temperatures magnetic fields at which the Josephson-flux occurs analyzed corresponding relaxation processes. A direct relationship between Josephson vortices dissipation transport (Josephson) critical current found. Special experimental techniques were applied to achieve those objectives, allowing (a) detection motion without influence intragrain...