Superconductivity Phase Diagram of Na(x)CoO(2).1.3H(2)O
| Autor: | Tomasz Klimczuk, M. L. Foo, Robert J. Cava, R. E. Schaak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Superconducting coherence length
Superconductivity Copper oxide Multidisciplinary Materials science Room-temperature superconductor Condensed matter physics Condensed Matter - Superconductivity chemistry.chemical_element FOS: Physical sciences Copper Superconductivity (cond-mat.supr-con) Condensed Matter::Materials Science chemistry.chemical_compound chemistry Condensed Matter::Superconductivity Hexagonal lattice Condensed Matter::Strongly Correlated Electrons Electronic band structure Phase diagram |
| Popis: | Although the microscopic origin of the superconductivity in high Tc copper oxides remains the subject of active inquiry, several of their electronic characteristics are well established as universal to all the known materials, forming the experimental foundation that all theories must address. The most fundamental of those characteristics is the dependence of the superconducting transition temperature on the degree of electronic band filling. Since the discovery of cuprate superconductivity in 1986 (1), the search for other families of superconductors that might help shed light on the superconducting mechanism of the cuprates has been of great interest. The recent report of superconductivity near 4K in the triangular lattice, layered sodium cobalt oxyhydrate, Na0.35CoO2.1.3H2O, is the best indication that superconductors related to the cuprates may be found (2). Here we show that the superconducting transition temperature of this compound displays the same kind of band-filling behavior that is observed in the cuprates. Specifically, that the optimal superconducting Tc occurs in a narrow range of band filling, and decreases for both underdoped and overdoped materials, in dramatic analogy to the phase diagram of the cuprate superconductors. Our results suggest that characterization of the detailed electronic and magnetic behavior of these new materials may help establish which of the many special characteristics of the cuprates is fundamental to their high Tc superconductivity. revised, publication information added |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|