We report on synthesis and characterization of gallide cluster based Mo 8 Ga 41 superconductor. Transport and magnetization measurements confirm the superconducting transition temperature to be 9.8 K. The upper critical field (H c2 ), lower critical field (H c1 ), Ginzburg-Landau coherence length (ξ GL ) and penetration depth(λ) are estimated to be 11.8T, 150G, 5.2nm, 148nm respectively. The electronic band structure, density of states and phonon dispersion curve calculations are obtained by using Density Functional Theory. The core level X-ray Photoelectron Spectroscopy (XPS) reveals the binding energy information of the constituting elements Mo and Ga in Mo 8 Ga 41 .The valence band spectra from XPS is in good agreement with calculated density of states (DOS). The zero field critical current density (J c ) at T = 2 K is ~ 3×10 5 A/cm 2 which is indicative of efficient flux pinning in the as grown compound. About two fold enhancement in critical current density with application of external pressure (1.1 GPa) is observed with marginal decrease in transition temperature. The fitting of current density to double exponential model confirms possibility of two gap superconductivity in Mo 8 Ga 41 .
The hydrostatic pressure effect on the resistivity and magnetization of the narrow band gap manganite Sm0.7−xLaxSr0.3MnO3 (x = 0, 0.1) systems has been investigated. At ambient pressure measurements, the parent compound Sm0.7Sr0.3MnO3 showed a ferromagnetic-insulating nature, whereas the 10% La-doped compound Sm0.6La0.1Sr0.3MnO3 showed a ferromagnetic-metallic nature. Furthermore, both samples showed a spin-reorientation transition (TSR) below Curie temperature, which originated from the Mn sublattice and was supported by an antiferromagnetic Sm(4f)-Mn(3d) interaction. Both samples exhibited a normal and inverse magnetocaloric effect as a result of these two different magnetic transitions. Magnetization measurements on Sm0.7Sr0.3MnO3 under pressure did not show an appreciable change in the Curie temperature, but enhanced TSR, whereas an insulator-metallic transition was observed during resistivity measurements under pressure. On the other hand, for Sm0.6La0.1Sr0.3MnO3, TC increased and TSR reduced upon the application of pressure. The metallic nature which is observed at ambient pressure resistivity measurement was further enhanced with 97% of piezoresistance. The pressure did not change the normal magnetocaloric effect of Sm0.7Sr0.3MnO3, but increased it in Sm0.6La0.1Sr0.3MnO3. However, there was not much change in the inverse magnetocaloric effect of both compounds. These studies were analyzed based on the pressure effect on the activation energy and scattering interaction factors.
In the present context, ammonium sulfate (NH4)2SO4 crystal phase stability has been examined at shocked conditions and observed that the title crystal undergoes the reversible crystallographic phase transitions with respect to the number of shock pulses and the observed phase transition sequence is Pnam-Pnam-distorted Pnam- Pnam-Pnam for 0,1,2,3, and 4 shocks, respectively and the observed phase transition sequence is evaluated by X-ray diffraction (XRD), Raman spectroscopy and optical spectroscopy (UV-DRS). Based on the observed analytical experimental results, it is authenticated the occurrence of the reversible phase transition which is caused by the molecular distortions accompanied by the rotational disorder of ammonium and sulfate groups of ions because of the impact of shock waves. This report is the first of its kind regarding the switchable phase transition inclusive of static temperature experiments observed for title crystal.
In the present research article, authors have experimentally evaluated the shock wave resistant properties of technologically potential materials of the anatase and the rutile phase TiO2 nanoparticles at the dynamic shock wave loaded conditions. The shock wave resistant behavior has been quantitatively drawn utilizing the crystallographic phase stability of the test samples for which the required crystallographic information has been extracted from the powder XRD patterns. Based on our observed experimental results as well as the respective interpretations, it is strongly authenticated that Rutile TiO2 NPs are suitable candidates for aerospace and defense industrial applications of materials fabrications because of the outstanding shock resistant properties than that of Anatase TiO2 NPs which undergo the crystallographic phase transition of rutile-TiO2 at shocked conditions.
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