About: Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Samples of Ca3Co3.93O9?d, prepared by classical ceramic route (CCR) and spark plasma sintering (SPS), were characterized by means of magnetic, electrical, and thermal experiments in a broad temperature range. The low temperature specific heat measured down to 0.3 K, reveals two important electronic contributions: the first one, dominated by magnetic excitations, that can be suppressed by an external magnetic field, and the second, due to band-like carriers, characterized by c50 mJ mol1 K1 for both samples. The ferrimagnetism, associated with the long-range magnetic order of IS Co3? species in rock-salt blocks detected below TF 15 K in the CCR samples, is absent in the SPS samples. Similarly, the specific heat peaks detected for the CCR sample at 410 and 840 K are not reproduced in the case of the SPS sample. In both samples the low temperature thermoelectric power is quantitatively explained by supposing the strongly correlated carriers are carrying the spin entropy. The lower hole concentration in the SPS than in the CCR sample is likely responsible for its higher thermopower, namely, at high temperatures where the configuration entropy of hopping carriers dominates. Samples of Ca3Co3.93O9?d, prepared by classical ceramic route (CCR) and spark plasma sintering (SPS), were characterized by means of magnetic, electrical, and thermal experiments in a broad temperature range. The low temperature specific heat measured down to 0.3 K, reveals two important electronic contributions: the first one, dominated by magnetic excitations, that can be suppressed by an external magnetic field, and the second, due to band-like carriers, characterized by c50 mJ mol1 K1 for both samples. The ferrimagnetism, associated with the long-range magnetic order of IS Co3? species in rock-salt blocks detected below TF 15 K in the CCR samples, is absent in the SPS samples. Similarly, the specific heat peaks detected for the CCR sample at 410 and 840 K are not reproduced in the case of the SPS sample. In both samples the low temperature thermoelectric power is quantitatively explained by supposing the strongly correlated carriers are carrying the spin entropy. The lower hole concentration in the SPS than in the CCR sample is likely responsible for its higher thermopower, namely, at high temperatures where the configuration entropy of hopping carriers dominates. (en)
Title	Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d (en)
skos:prefLabel	Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d (en)
skos:notation	RIV/60461373:22340/12:43893210!RIV13-GA0-22340___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA203/09/1036), Z(AV0Z10100521)
http://linked.open...iv/cisloPeriodika	7
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Sedmidubský, David Huber, Štěpán
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemicko-inženýrská
http://linked.open...dnocenehoVysledku	147743
http://linked.open...ai/riv/idVysledku	RIV/60461373:22340/12:43893210
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	thermoelectric power; specific heat; sintering; plasma materials processing; hopping conduction; hole density; galvanomagnetic effects; ferrimagnetic materials; entropy; ceramics; calcium compounds (en)
http://linked.open.../riv/klicoveSlovo	entropy galvanomagnetic effects ferrimagnetic materials ceramics specific heat calcium compounds hole density hopping conduction plasma materials processing thermoelectric power sintering
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[A6FABA72F549]
http://linked.open...i/riv/nazevZdroje	Journal Applied Phys.
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	9 (xsd:int)
http://linked.open...vavai/riv/projekt	Thermoelectric cobaltites
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	111
http://linked.open...iv/tvurceVysledku	Knížek, Karel Maryško, Miroslav Sedmidubský, David Hejtmánek, Jiří Huber, Štěpán Jankovský, Ondřej Jirák, Z. Lenoir, B. Masschelein, P.
http://linked.open...ain/vavai/riv/wos	000303282401178
http://linked.open...n/vavai/riv/zamer	Physics and technology of nanostructures, surfaces and thin films
issn	0021-8979
number of pages	3 (xsd:int)
http://bibframe.org/vocab/doi	10.1063/1.3677312
http://localhost/t...ganizacniJednotka	22340

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