Systematic NMR studies of high-Tc and two-leg spin-ladder systems

Y. Kitaoka, K. Magishi, S. Matsumoto, K. Ishida, S. Ohsugi, K. Asayama, M. Uehara, T. Nagata, J. Akimitsu

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4 Citations (Scopus)


We review systematic NMR studies on underdoped high-Tc, cuprates and two-leg spin-ladder systems, focusing on their spin gap and dynamics. The pressure-induced superconductivity was discovered in Sr14-xCaxCu24O41 comprising the quasi-one-dimensional S = 1/2 two-leg spin-ladder Cu2O3 planes. Remarkably, the new parent cuprate is the Mott insulator with the spin gap in contrast to the antiferromagnetic (AF) insulator for the high-Tc cuprates. From the Cu-NMR results in the ladder Cu2O3 plane on single crystals Sr14-xCaxCu24O41 with x = 9 (hereafter denoted as Ca9) and x = 11.5 (Ca11.5), it is shown that the spin gap, Δ = 510 K in the Sr14 is significantly reduced upon isovalent Ca substitution, but its magnitude remains nearly constant with Δ = 270 and 280 K for the Ca9 and Ca11.5, respectively. In T range of T ≥ Δ, the spin dynamics in carrier-doped two-leg spin-ladder systems are characterized by the behaviour similar to the S = 1/2 1D Heisenberg system. By contrast, the transport property shares a common feature, i.e, due to the spin-gap opening the charge transport is confined in the 2D CuO2 plane for underdoped high-Tc cuprates and in the quasi-1D ladder for spin-ladder compounds.

Original languageEnglish
Pages (from-to)487-492
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Issue numberPART 1
Publication statusPublished - Jan 1998
Externally publishedYes


  • High-Tcuprates
  • NMR
  • Quantum fluctuation
  • Spin gap
  • Spin ladder
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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