Correlation among the effective mass (m⁎), λ and T of superconducting cuprates in a Casimir energy scenario
| Autor: | Marcos Tadeu D’Azeredo Orlando, A. S. Cavichini, A.N. Rouver, J.R. Rocha |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Condensed matter physics 010308 nuclear & particles physics Graphene General Physics and Astronomy 01 natural sciences Bidimensionality law.invention Casimir effect Effective mass (solid-state physics) law Condensed Matter::Superconductivity 0103 physical sciences Charge carrier Cuprate 010306 general physics Anisotropy |
| Zdroj: | Physics Letters A. 382:1486-1491 |
| ISSN: | 0375-9601 |
| DOI: | 10.1016/j.physleta.2018.04.001 |
| Popis: | The relevance of the Casimir effect, discovered in 1948, has recently been pointed out in studies on materials such as graphene and high-temperature superconducting cuprates. In particular, the relationship between Casimir energy and the energy of a superconducting condensate with anisotropy characterized by high bidimensionality has already been discussed in certain theoretical scenarios. Using this proposal, this work describes the relationship between the effective mass of the charge carriers ( m ⁎ = α m e ) and the macroscopic parameters characteristic of several families of high- T c superconducting cuprates (Cu-HTSC) that have copper and oxygen superconducting planes (Cu-O). We have verified that an expression exists that correlates the effective mass, the London penetration length in the plane λ a b , the critical temperature T c and the distance d between the equivalent superconducting planes of Cu-HTSC. This study revealed that the intersection between the asymptotic behavior of α as a function of T c and the line describing the optimal value of α ≃ 2 ( m ⁎ ≃ 2 m e ) indicates that a nonadiabatic region exists, which implies a carrier-lattice interaction and where the critical temperature can have its highest value in Cu-HTSC. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect