caa a22 4500 445380780 CHVBK 20180317143016.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0920-8 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0920-8 Influence of Grain Size on the Superconductivity ofLa1.85Sr0.15CuO4 [Elektronische Daten] [Devina Sharma, Ranjan Kumar, H. Kishan, V. Awana] We study the influence of varying grain size on superconductivity of bulk La1.85Sr0.15CuO4 superconductor. The samples are synthesized by a sol-gel method. The grain size is varied by sintering the samples at various temperatures between700 °C to1050 °C. The samples are characterized by X-Ray Diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), resistivity and magnetization measurements. The electrical resistivity measurements revealed considerable lowering of the superconducting transition temperature ($T_{\mathrm{c}}^{R=0}$) and broadening of the transition width (ΔT c) with decreasing grain size though the onset of transition temperature ($T_{\mathrm{c}}^{\mathrm{onset}}$) changes only marginally. The magnetic measurements carried out are consistent with each other and scale well with the grain size. Critical current density has been calculated from the magnetization hysteresis, assuming that supercurrents flow throughout the sample as a whole and within the individual grains as well. The observed results have been discussed on the basis of inter- and intra-granular boundary characteristics of high-temperature superconductors (HTSc). It is found that lowering of grain size deteriorates the superconducting properties in general. Springer Science+Business Media, LLC, 2010 Sol-gel nationallicence Resistivity nationallicence Magnetization nationallicence Critical current density nationallicence Grain boundary nationallicence Sharma Devina Department of Physics, Panjab University, 160014, Chandigrah, India aut Kumar Ranjan Department of Physics, Panjab University, 160014, Chandigrah, India aut Kishan H. National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, 110012, New Delhi, India aut Awana V. National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, 110012, New Delhi, India aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 205-209 1557-1939 24:1-2<205 2011 24 10948 https://doi.org/10.1007/s10948-010-0920-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0920-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sharma Devina Department of Physics, Panjab University, 160014, Chandigrah, India aut NATIONALLICENCE 700 1- Kumar Ranjan Department of Physics, Panjab University, 160014, Chandigrah, India aut NATIONALLICENCE 700 1- Kishan H. National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, 110012, New Delhi, India aut NATIONALLICENCE 700 1- Awana V. National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, 110012, New Delhi, India aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 205-209 1557-1939 24:1-2<205 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer