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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F12%3A43893210%21RIV13-GA0-22340___
rdf:type
skos:Concept n15:Vysledek
dcterms: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.
dcterms:title
Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d
skos:prefLabel
Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O91d
skos:notation
RIV/60461373:22340/12:43893210!RIV13-GA0-22340___
n15:predkladatel
n21:orjk%3A22340
n3:aktivita
n8:Z n8:P
n3:aktivity
P(GA203/09/1036), Z(AV0Z10100521)
n3:cisloPeriodika
7
n3:dodaniDat
n12:2013
n3:domaciTvurceVysledku
n10:1924613 n10:6541690
n3:druhVysledku
n13:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
147743
n3:idVysledku
RIV/60461373:22340/12:43893210
n3:jazykVysledku
n18:eng
n3:klicovaSlova
thermoelectric power; specific heat; sintering; plasma materials processing; hopping conduction; hole density; galvanomagnetic effects; ferrimagnetic materials; entropy; ceramics; calcium compounds
n3:klicoveSlovo
n5:thermoelectric%20power n5:calcium%20compounds n5:plasma%20materials%20processing n5:hole%20density n5:ferrimagnetic%20materials n5:hopping%20conduction n5:sintering n5:ceramics n5:specific%20heat n5:galvanomagnetic%20effects n5:entropy
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[A6FABA72F549]
n3:nazevZdroje
Journal Applied Phys.
n3:obor
n20:CA
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
9
n3:projekt
n17:GA203%2F09%2F1036
n3:rokUplatneniVysledku
n12:2012
n3:svazekPeriodika
111
n3:tvurceVysledku
Jankovský, Ondřej Masschelein, P. Hejtmánek, Jiří Knížek, Karel Maryško, Miroslav Lenoir, B. Jirák, Z. Sedmidubský, David Huber, Štěpán
n3:wos
000303282401178
n3:zamer
n7:AV0Z10100521
s:issn
0021-8979
s:numberOfPages
3
n19:doi
10.1063/1.3677312
n16:organizacniJednotka
22340