nan Shruti

Bulk Superconductivity in Bismuth Oxysulfide Bi4O4S3

A very recent report on the observation of superconductivity in Bi(4)O(4)S(3) [Mizuguchi, Y.; http://arxiv.org/abs/1207.3145] could potentially reignite the search for superconductivity in a broad range of layered sulfides. We report here the synthesis of Bi(4)O(4)S(3) at 500 °C by a vacuum encapsulation technique and its basic characterizations. The as-synthesized Bi(4)O(4)S(3) was contaminated with small amounts of Bi(2)S(3) and Bi impurities. The majority phase was found to be tetragonal (space group I4/mmm) with lattice parameters a = 3.9697(2) Å and c = 41.3520(1) Å. Both AC and DC magnetization measurements confirmed that Bi(4)O(4)S(3) is a bulk superconductor with a superconducting transition temperature (T(c)) of 4.4 K. Isothermal magnetization (M-H) measurements indicated closed loops with clear signatures of flux pinning and irreversible behavior. The lower critical field (H(c1)) at 2 K for the new superconductor was found to be ~15 Oe. Magnetotransport measurements showed a broadening of the resistivity (ρ) and a decrease in T(c) (ρ = 0) with increasing magnetic field. The extrapolated upper critical field H(c2)(0) was ~31 kOe with a corresponding Ginzburg-Landau coherence length of ~100 Å . In the normal state, the ρ ~ T(2) dependence was not indicated. Hall resistivity data showed a nonlinear magnetic field dependence. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as-synthesized Bi(4)O(4)S(3). On the other hand, Bi heat-treated at the same temperature is not superconducting, thus excluding the possibility of impurity-driven superconductivity in the newly discovered superconductor Bi(4)O(4)S(3).

Pressure effects on topological crystalline insulator SnTe and derived superconductor Sn0.5In0.5Te

We are reporting decrease in superconducting transition temperature accompanied by increased metallicity in indium doped SnTe superconductor. SnTe is a topological crystalline insulator and superconductivity is achieved by indium substitution in place of tin. With application of hydrostatic pressure we find negative dTc/dP of ~ -0.6K/GPa upto 2.5 GPa. The overall phenomenon is ascribed to unconventional superconductivity. Decrease in resistivity is also seen in single crystal SnTe with application of pressure but no evidence of superconductivity is observed.

Superconductivity in BiS[sub 2] based Bi[sub 4]O[sub 4]S[sub 3] novel compound

We report here synthesis and basic characterizations of Bi 4 O 4 S 3 superconductor. The sample is crystallized in tetragonal I4/mmm space group with lattice parameters a = 3.969(2) A, c = 41.352(1) A. Both DC magnetization and resistivity measurements confirmed that Bi 4 O 4 S 3 is a bulk superconductor with superconducting transition temperature (Tc ) of 4.4K. Closed loops in isothermal magnetization (MH) measurements are clear signature of flux pinning and irreversible behavior. The lower critical field (Hc1 ) is found to be ∼15 Oe at 2K. The magneto-transport ρ(T, H) measurements showed resistive broadening and decrease in Tc (ρ = 0) with increasing magnetic field. Upper critical field calculated through extrapolation Hc2 (0) is ∼ 31kOe with corresponding Ginzburg-Landau coherence length ∼100 A. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi 4 O 4 S 3 .

Superconductivity in BiS2based Bi4O4S3novel compound

We report here synthesis and basic characterizations of Bi 4 O 4 S 3 superconductor. The sample is crystallized in tetragonal I4/mmm space group with lattice parameters a = 3.969(2) A, c = 41.352(1) A. Both DC magnetization and resistivity measurements confirmed that Bi 4 O 4 S 3 is a bulk superconductor with superconducting transition temperature (Tc ) of 4.4K. Closed loops in isothermal magnetization (MH) measurements are clear signature of flux pinning and irreversible behavior. The lower critical field (Hc1 ) is found to be ∼15 Oe at 2K. The magneto-transport ρ(T, H) measurements showed resistive broadening and decrease in Tc (ρ = 0) with increasing magnetic field. Upper critical field calculated through extrapolation Hc2 (0) is ∼ 31kOe with corresponding Ginzburg-Landau coherence length ∼100 A. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi 4 O 4 S 3 .

Study of transport and magnetic properties in new BiS2 based layered LaO0.5F0.5BiS2 superconductor

We report basic parameters of a new BiS2 based layered LaO0.5F0.5BiS2 with TC onset of 2.7K which is confirmed by magneto-transport as well as DC magnetization data. The DC magnetization curve shows bulk superconductivity in the sample. Crystal structure has BiS2 layers that resemble the high Tc iron oxy-pnictide superconductors. Hc2 (0) is found to be 19kOe. Hall resistivity is linear with magnetic field at 10K with RH = −5.04036−10−8m3/C and n = 1.24×1020percm3 respectively.

Superconductivity in BiS2 based Bi4O4S3 novel compound

We report here synthesis and basic characterizations of Bi 4 O 4 S 3 superconductor. The sample is crystallized in tetragonal I4/mmm space group with lattice parameters a = 3.969(2) A, c = 41.352(1) A. Both DC magnetization and resistivity measurements confirmed that Bi 4 O 4 S 3 is a bulk superconductor with superconducting transition temperature (Tc ) of 4.4K. Closed loops in isothermal magnetization (MH) measurements are clear signature of flux pinning and irreversible behavior. The lower critical field (Hc1 ) is found to be ∼15 Oe at 2K. The magneto-transport ρ(T, H) measurements showed resistive broadening and decrease in Tc (ρ = 0) with increasing magnetic field. Upper critical field calculated through extrapolation Hc2 (0) is ∼ 31kOe with corresponding Ginzburg-Landau coherence length ∼100 A. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi 4 O 4 S 3 .