caa a22 4500 445382708 CHVBK 20180317143022.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-1070-8 doi (NATIONALLICENCE)springer-10.1007/s10948-010-1070-8 Balamurugan S. Department of Nanotechnology, School of Interdisciplinary Courses, Noorul Islam Centre for Higher Education (NICHE), 629 180, Kumaracoil, Thuckalay, Tamilnadu, India aut Impact of Tuning Molar Ratio in the Starting Materials: Magneto -Transport Features of Hybrid YSr2Ru0.9Cu2.1O7.9 [Elektronische Daten] [S. Balamurugan] The impact of slightly tuning molar ratio in the starting materials on the physical properties of 1212-type rutheno-cuprate, YSr2Ru0.9Cu2.1O7.9 (nominal) samples prepared under four synthesis approaches are reported. Interestingly, all samples clearly show the differences in the physical properties of the samples prepared under different synthetic protocols. However, neither XRD nor EDX reveal any notable differences in the crystal structure or sample composition. All the samples exhibit magneto-superconducting properties (H ext=5Oe) which are slightly varied with synthetic approaches. The high field (H ext=10kOe) temperature dependence of magnetization data shows a sharp ferromagnetic transition around 150K and all the samples obey Curie-Weiss linear behavior above 180K. The experimental effective paramagnetic moment for the various samples is in the range of 2.5 and 2.7μ B/Ru which are in line with the literature report. The magnetization, M(H) isotherm curves measured at 5K and −10kOe≤H≤10kOe conditions reveal weak ferromagnetic-like hysteresis loops for all samples with returning moment (M r) and coercive field (H c), whereas the high field M(H) loops indicate soft ferromagnetic behaviors with magnetic saturation. The saturation moment of the samples is slightly varied with the synthesis approaches. None of the samples showed bulk superconductivity ( $T_{\mathrm{c}}^{R = 0})$ down to 2K, while all samples show onset transitions ( $T_{\mathrm{c}}^{\mathrm{onset}}$ ) except the sample prepared by approach-3. The latter approach sample shows semiconducting behavior down to 2K. The $T_{\mathrm{c}}^{\mathrm{onset}}$ noticed at 34K, 12K, and 6K for the sample prepared by approach-1, 2, and 4, respectively. The nearly linear dependence suggests that hopping conduction is dominant in certain temperature range for all samples. The magneto-transport features of these samples exhibit maximum magnetoresistance (MR) at low temperatures. Remarkably, the sample prepared by approach-1 shows largest −MR about 77% at low temperature 2K and H=90kOe which stimulates for further investigations. Among the four synthesis approaches employed in the present study, we can probably suggest that the approach-1 (0.5Y2O3+0.5SrO2+1.5SrCuO2+0.9RuO2+0.6CuO) is the preferable method to achieve the best sample (in terms of magneto-transport features). Springer Science+Business Media, LLC, 2010 Synthesis protocol nationallicence Rutheno -cuprates nationallicence Hybrid nationallicence YSr2RuCu2O8 nationallicence High-pressure-synthesis nationallicence Magneto -superconductivity nationallicence Magneto-transport properties nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1633-1641 1557-1939 24:5<1633 2011 24 10948 https://doi.org/10.1007/s10948-010-1070-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1070-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Balamurugan S. Department of Nanotechnology, School of Interdisciplinary Courses, Noorul Islam Centre for Higher Education (NICHE), 629 180, Kumaracoil, Thuckalay, Tamilnadu, India aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1633-1641 1557-1939 24:5<1633 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer