|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Measurements of thermodynamic and transport properties of EuC$_2$: a low-temperature analogue of EuO | | O. Heyer
; P. Link
; D. Wandner
; U. Ruschewitz
; T. Lorenz
; | | Date: |
4 Mar 2011 | | Abstract: | EuC$_2$ is a ferromagnet with a Curie-temperature of $T_C simeq 15,$K. It
is semiconducting with the particularity that the resistivity drops by about 5
orders of magnitude on cooling through $T_C$, which is therefore called a
metal-insulator transition. In this paper we study the magnetization, specific
heat, thermal expansion, and the resistivity around this ferromagnetic
transition on high-quality EuC$_2$ samples. At $T_C$ we observe well defined
anomalies in the specific heat $c_p(T)$ and thermal expansion $alpha(T)$ data.
The magnetic contributions of $c_p(T)$ and $alpha(T)$ can satisfactorily be
described within a mean-field theory, taking into account the magnetization
data. In zero magnetic field the magnetic contributions of the specific heat
and thermal expansion fulfill a Gr"uneisen-scaling, which is not preserved in
finite fields. From an estimation of the pressure dependence of $T_C$ via
Ehrenfest’s relation, we expect a considerable increase of $T_C$ under applied
pressure due to a strong spin-lattice coupling. Furthermore the influence of
weak off stoichiometries $delta$ in EuC$_{2 pm delta}$ was studied. It is
found that $delta$ strongly affects the resistivity, but hardly changes the
transition temperature. In all these aspects, the behavior of EuC$_2$ strongly
resembles that of EuO. | | Source: | arXiv, 1103.0980 | | 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