Hall effect measurements on thermoelectric Ca3Co4O9: On how to determine the charge carrier concentration in strongly correlated misfit cobaltites

被引：14
作者：
Schrade, Matthias [1 ,2 ]
Norby, Truls [2 ]
Finstad, Terje G. [1 ]
机构：
[1] Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, N-0371 Oslo, Norway
[2] Univ Oslo, Dept Chem, Ctr Mat Sci & Nanotechnol, N-0371 Oslo, Norway
来源：
JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 20期
关键词：
OXYGEN NONSTOICHIOMETRY; LAYERED COBALTITE; TRANSPORT-PROPERTIES; OXIDES; FE;
D O I：
10.1063/1.4921861
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The Hall coefficient R-H and electrical conductivity of misfit calcium cobalt oxide (Ca2CoO3-delta)(q)(CoO2) (CCO) were measured at room temperature for different oxygen vacancy concentrations delta. Based on these and numerous previous results, it is shown that the charge carrier concentrations n obtained by the classical formula R-H = 1/ne are between 3 and 6 x 10(20) cm(-3) and thereby much lower than those derived by other experimental techniques and fail to explain the observed electric properties of CCO. We show that the experimental results are well described using an earlier proposed t-J-model for strongly correlated electrons on a triangular lattice. The hopping parameter t for CCO was found to be approximate to -20K and the charge carrier concentration of fully oxidized CCO to be 5.7 x 10(21) cm(-3) (0.41 hole type carriers per formula unit), in agreement with other experimental techniques. (c) 2015 AIP Publishing LLC.
引用
收藏
页数：6
相关论文
共 48 条
[11]   Renormalized bands and low-temperature colossal thermopower induced by Ir doping in Ca3Co4O9 system [J].
Huang, Yanan ;
Zhao, Bangchuan ;
Lin, Shuai ;
Song, Wenhai ;
Sun, Yuping .
JOURNAL OF APPLIED PHYSICS, 2013, 114 (09)
[12]   Evidence for oxygen vacancies in misfit-layered calcium cobalt oxide, [CoCa2O3]qCoO2 [J].
Karppinen, M ;
Fjellvåg, H ;
Konno, T ;
Morita, Y ;
Motohashi, T ;
Yamauchi, H .
CHEMISTRY OF MATERIALS, 2004, 16 (14) :2790-2793
[13]   Anisotropy of the Mechanical and Thermoelectric Properties of Hot-Pressed Single-Layer and Multilayer Thick Ca3Co4O9 Ceramics [J].
Kenfaui, Driss ;
Chateigner, Daniel ;
Gomina, Moussa ;
Noudem, Jacques Guillaume .
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, 2011, 8 (01) :214-226
[14]   Thermopower in cobalt oxides [J].
Koshibae, W ;
Tsutsui, K ;
Maekawa, S .
PHYSICAL REVIEW B, 2000, 62 (11) :6869-6872
[15]   Superconductivity in CoO2 layers and the resonating valence bond mean-field theory of the triangular lattice t-J model (vol B 68, art no 104508, 2003) -: art. no. 059901 [J].
Kumar, B ;
Sriram Shastry, B .
PHYSICAL REVIEW B, 2004, 69 (05)
[16]   Superconductivity in CoO2 layers and the resonating valence bond mean-field theory of the triangular lattice t-J model -: art. no. 104508 [J].
Kumar, B ;
Shastry, BS .
PHYSICAL REVIEW B, 2003, 68 (10)
[17]   Three forms of the misfit layered cobaltite [Ca2CoO3] [CoO2]1.62 -: A 4D structural investigation [J].
Lambert, S ;
Leligny, H ;
Grebille, D .
JOURNAL OF SOLID STATE CHEMISTRY, 2001, 160 (02) :322-331
[18]   Hall effect on the triangular lattice [J].
Leon, G. ;
Berthod, C. ;
Giamarchi, T. ;
Millis, A. J. .
PHYSICAL REVIEW B, 2008, 78 (08)
[19]   High-temperature Thermoelectric Properties of the Ca3-x,KxCo4O9 (0 ≤ x ≤ 0.3) System [J].
Lim, Chang-Hyun ;
Choi, Soon-mok ;
Seo, Won-Seon .
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2010, 57 (04) :1054-1058
[20]   Alternating Misfit Layered Transition/Alkaline Earth Metal Chalcogenide Ca3Co4O9 as a New Class of Chalcogenide Materials for Hydrogen Evolution [J].
Lim, Chee Shan ;
Chua, Chun Kiang ;
Sofer, Zdenek ;
Jankovsky, Ondrej ;
Pumera, Martin .
CHEMISTRY OF MATERIALS, 2014, 26 (14) :4130-4136
12345