|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'503'724
Articles rated: 2609
23 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Strongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9 | | P. Limelette
; V. Hardy
; P. Auban-Senzier
; D. Jerome
; D. Flahaut
; S. Hebert
; R. Fresard
; Ch. Simon
; J. Noudem
; A. Maignan
; | | Date: |
19 May 2005 | | Journal: | Phys. Rev. B. 71, 233108 (2005) DOI: 10.1103/PhysRevB.71.233108 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | We have performed both in-plane resistivity, Hall effect and specific heat measurements on the thermoelectric cobalt oxide Ca$_{3}$Co$_{4}$O$_{9}$. Four distinct transport regimes are found as a function of temperature, corresponding to a low temperature insulating one up to $T_{min}approx $63 K, a strongly correlated Fermi liquid up to $T^*approx $140 K, with $
ho=
ho_0+AT^2$ and $Aapprox 3.63$ $10^{-2} mu Omega cm/K^{2}$, followed by an incoherent metal with $k_Flleq 1$ and a high temperature insulator above T$^{**}approx $510 K . Specific heat Sommerfeld coefficient $gamma = 93$ mJ/(mol.K$^{2}$) confirms a rather large value of the electronic effective mass and fulfils the Kadowaki-Woods ratio $A/gamma^2 approx 0.45$ 10$^{-5}$ $mu Omega cm.K^2/(mJ^2mol^{-2})$. Resistivity measurements under pressure reveal a decrease of the Fermi liquid transport coefficient A with an increase of $T^*$ as a function of pressure while the product $A(T^*)^2/a$ remains constant and of order $h/e^2$. Both thermodynamic and transport properties suggest a strong renormalization of the quasiparticles coherence scale of order $T^*$ that seems to govern also thermopower. | | Source: | arXiv, cond-mat/0505464 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER