High-field magnetoconductance in La-Sr manganites of FM and AFM ground states

0493174 - FZÚ 2019 RIV NL eng J - Článek v odborném periodiku
Jirák, Zdeněk - Kaman, Ondřej - Knížek, Karel - Levinský, Petr - Míšek, Martin - Veverka, Pavel - Hejtmánek, Jiří
High-field magnetoconductance in La-Sr manganites of FM and AFM ground states.
Journal of Magnetism and Magnetic Materials. Roč. 456, Jun (2018), s. 167-178. ISSN 0304-8853. E-ISSN 1873-4766
Grant CEP: GA ČR GA15-10088S
Institucionální podpora: RVO:68378271
Klíčová slova: metallic oxides * perovskite manganite * FM and A-type AFM ordering * tunneling magnetoresistance * large-grain vs. nanogranular systems
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.683, rok: 2018

Large-grain La1–xSrxMnO3 ceramic samples of compositions x=0.45 and 0.55, representing the ferromagnetic (FM) and A-type antiferromagnetic (AFM) ground states, were produced via classical sintering at 1500 °C of cold-pressed sol-gel prepared single-phase nanoparticles. Using the same precursors, nanogranular forms of both manganite ceramics were prepared by fast spark plasma sintering at low temperature of 900 °C, which limits the growth of crystal grains. The magnetotransport of both the bulk and nanogranular forms was investigated in a broad range of magnetic fields up to 130 kOe and analyzed on the basis of detailed magnetic measurements. For interpretation of observed behaviors, the theory of grain-boundary tunneling is revisited.
Trvalý link: http://hdl.handle.net/11104/0286586