Two-fold anisotropic superconducting state in topological superconductor Sn4_4Au

Here we report the anisotropic magnetotransport properties in the superconducting state of Sn$_4$Au single crystal. Sn$_4$Au single crystal is synthesized through an easy melt growth method. Superconducting properties are evidenced by resistivity vs. temperature and DC magnetization measurements. Isothermal magnetization measurements hint toward type-II superconductivity in Sn$_4$Au. In-plane and out-of-plane resistivity measurements show anisotropic behavior of the upper critical field at temperatures below superconducting transition (T$_c$ = 2.3 K). The observed anisotropy is more elucidated in resistivity measurements performed below Tc at different tilt angles. The anisotropy parameter is found to be 1.26. The observed results show the presence two-fold anisotropic superconducting state in Sn$_4$Au single crystal, which may be induced due to the layered structure of synthesized Sn$_4$Au single crystal.Comment: 10 Pages Text + Figs: Revised Submitted: Euro. Phys. Let

An expedient synthesis of tetrakis (cyclopropylmethyl) methane

Synthesis of tetrakis(cyclopropylmethyl)methane, a new symmetric product has been described using the radical mediated gem-diallylation of cyclopropylmethyl xanthate as a key step and its single crystal X-ray analysis established its C2-symmetry

Enantioselective epoxidation of 2,2-Dialkyl-2H-chromenes with Oxone and Jacobsen's (S,S)-Mn(III)(Ph-salen)CI complex : Solvent effect

213-21

Uncertainties in emissions estimates of greenhouse gases and air pollutants in India and their impacts on regional air quality

Greenhouse gas and air pollutant precursor emissions have been increasing rapidly in India. Large uncertainties exist in emissions inventories and quantification of their uncertainties is essential for better understanding of the linkages among emissions and air quality, climate, and health. We use Monte Carlo methods to assess the uncertainties of the existing carbon dioxide (CO2), carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM) emission estimates from four source sectors for India. We also assess differences in the existing emissions estimates within the nine subnational regions. We find large uncertainties, higher than the current estimates for all species other than CO, when all the existing emissions estimates are combined. We further assess the impact of these differences in emissions on air quality using a chemical transport model. More efforts are needed to constrain emissions, especially in the Indo-Gangetic Plain, where not only the emissions differences are high but also the simulated concentrations using different inventories. Our study highlights the importance of constraining SO2, NOx, and NH3 emissions for secondary PM concentrations