## Abstract

We have re-investigated the electrical resistivity ρ and the magnetic susceptibility x of the spin-ladder cuprate Sr_{14-x}A_{x}Cu_{24}O_{41} (A=Ca, Y, La), consisting of two-dimensional Cu_{2}O_{3} ladder planes and one-dimensional CuO_{2} chains. The dlnρ/d(1/T) vs. T plot exhibits a broad peak around 200 K for x = 0. The peak temperature T_{ρ} goes down with increasing hole-concentration p in the ladder for x(Ca)> 0, while it goes up with decreasing p in the ladder for x(Y, La)> 0. The observed T_{ρ} is regarded as a temperature below which holes in the ladder are localized. On the other hand, the x^{-1} vs. T plot exhibits inflection indicating deviation from the Curie-Weiss law around 200 K for x = 0. The inflection temperature T_{x} also goes down with increasing p in the ladder, and goes up with decreasing p in the ladder. The observed T_{x} is regarded as a temperature above which Cu^{2+} spins in the ladder notably contribute to the susceptibility. Values of T_{x} and its x-dependence have been found to be almost the same as those of T_{ρ}. This coincidence strongly suggests that holes in the ladder are paired and localized at low temperatures below T_{x} (and T_{ρ}) where almost all Cu^{2+} spins in the ladder complete to form spin-singlet pairs.

Original language | English |
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Pages (from-to) | 639-642 |

Number of pages | 4 |

Journal | Solid State Communications |

Volume | 105 |

Issue number | 10 |

DOIs | |

Publication status | Published - 1998 Mar |

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_{24}O

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