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28 March 2024 |
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Suppression of the charge-density-wave state in Sr14Cu24O41 by calcium doping | T Vuleti?
; B Korin-Hamzi?
; S Tomi?
; B Gorshunov
; P Haas
; T Rõõm
; M Dressel
; J Akimitsu
; T Sasaki
; T Nagata
; | Date: |
27 Jun 2003 | Journal: | Phys Rev Lett, 90 (25 Pt 1), 257002 | Abstract: | The charge response in the spin chain and/or ladder compound Sr14-xCaxCu24O41 is characterized by dc resistivity, low-frequency dielectric spectroscopy and optical spectroscopy. We identify a phase transition below which a charge-density wave (CDW) develops in the ladder arrays. Calcium doping suppresses this phase with the transition temperature decreasing from 210 K for x=0 to 10 K for x=9, and the CDW gap from 130 meV down to 3 meV, respectively. This suppression is due to the worsened nesting originating from the increase of the interladder tight-binding hopping integrals, as well as from disorder introduced at the Sr sites. These results altogether speak in favor of two-dimensional superconductivity under pressure. | Source: | PubMed, pmid12857158 | Services: | Forum | Review | Favorites |
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