SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.7: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2
Magnetic and thermoelectric properties of Bi-substituted La0.95−xBixSr0.05CoO3 — •Divya Prakash Dubey and Ratnamala Chatterjee — IIT Delhi Hauz Khas New Delhi 110016 India
We present the results of a comprehensive investigation of electric and thermal transport properties of polycrystalline Bi substituted La0.95−xBixSr0.05CoO3 for x=0,0.1 and 0.2 (LBSCO-0, 1 & 2). The electrical resistivity reflects the semiconducting nature with interesting n-type to p-type transition 52K for LBSCO-1 and LBSCO-2 samples. The substitution of higher atomic weight elements Bi at La site drastically affects overall thermal conductivity by reducing the lattice contribution (κ 0.12W/m-K at T= 50K) and also enhance the Seebeck coefficient (S 354 µV/K). The increase in the resistivity and Seebeck coefficient for Bi-substituted system is related to the decrease in the available charge carrier concentration ( 5.12 1020 cm3). The phonon mediated charge transport via phonon drag effect below 50K and a large increment in ZT 0.17 at RT for LBSCO-2 composition has been observed that is 1-order larger to pristine undoped LBSCO-0 and even higher to the other existing cobaltite*s-based thermoelectric choice.