NMR/NQR Studies on Magnetism of Spin Ladder Sr14−xAxCu24O41 (A = Ca and La)

  • K. Kumagai
  • S. Tsuji
  • K. Maki
  • T. Goto
  • T. Fukase
Part of the Advances in Materials Research book series (ADVSMATERIALS, volume 4)

Abstract

Hole-doped cuprates with low-dimensional Heisenberg spin systems have been investigated intensively after the discovery of high-T c superconductivity. The predictions of spin gap and superconductivity in carrier-doped ladder systems, i.e. coupled chain systems, have stimulated a renewal of studies on quantum behavior in low-dimensional systems [1,2]. The two-leg ladder cuprate, Sr14Cu24O41, is a unique system in which the carriers are controlled. Sr14Cu24O41 consists of CuO2 layers with one-dimensional (1D) chains of edge-sharing clusters and Cu2O3 layers with a two-leg ladder configuration, as shown in Fig. 16.1 [3]. Holes are transferred from the chain to the ladder site by the substitution of Ca for Sr and the system becomes conductive with increasing x on Sr14Cu24O41 [4]. In this system, the Cu-O chain is regarded as a nonconductive charge reservoir. When high pressure is applied, the compounds become more conductive and superconductivity appears finally around x = 12 under a high pressure of 3 ∼ 4GPa [5]. It is important to investigate the magnetic nature without any holes or with dilute holes in the ladder system. For La3+-substitution for Sr2+, the number of holes in the system decreases. The formal valence of Cu in both the chain and the ladder is 2+ for Sr8La6Cu24O41, i.e. here are no holes in the system. Thus, the system is expected to be completely insulating with long-range magnetic ordering of the Cu spins.

Keywords

Coherence Kato Sera Isobe Maki 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • K. Kumagai
    • 1
  • S. Tsuji
    • 1
  • K. Maki
    • 1
  • T. Goto
    • 2
  • T. Fukase
    • 3
  1. 1.Graduate School of ScienceHokkaido UniversitySapporoJapan
  2. 2.Faculty of Science and TechnologySophia UniversityTokyoJapan
  3. 3.Institute for Materials ResearchTohoku UniversitySendaiJapan

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