High-Pressure Transport Properties of the Superconducting Spin-Ladder System Sr14-xCaxCu24O41+δ

Takeshi Nakanishi, Nobuo Môri, Chizuko Murayama, Hiroki Takahashi, Takashi Nagata, Masatomo Uehara, Jun Akimitsu, Kyôichi Kinoshita, Naoki Motoyama, Hiroshi Eisaki, Shin Ichi Uchida

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12 Citations (Scopus)


We report the electrical resistivity, the Hall coefficient, RH, and the Magnetoresistance, MR, at pressures up to 2.0 GPa, of the spin-ladder compound Sr14-xCaxCu24O41+δ, on both a polycrystal (x = 13.6) and single crystals (x = 11 and 12), in which superconductivity has been observed only in a range of both Ca content (∼ 11 < x < 14) and pressure (∼ 1.5 < P <∼ 8 GPa). The pressure dependence of the RH, with positive sign, indicates that carrier density increases with increasing pressure and localization of hole carriers at low temperature is substantially suppressed by applying pressure. We have also found that a positive MR, which violates Kohler's rule, seems to appear below the temperature at which a spin gap begins to open and strongly depends on the temperature as well as both on Ca content and applied pressure, suggesting that this MR is closely related to the mobile holes in the spin singlet state.

Original languageEnglish
Pages (from-to)2408-2414
Number of pages7
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - Jul 1998
Externally publishedYes


  • Hall effect
  • High pressure effect
  • Magnetoresistance
  • Spin-ladder system
  • SrCaCuO
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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