NMR study of carrier doping effects on spin gaps in the spin ladder Sr14-xAxCu24O41 (A = Ca, Y, and La)

Ken Ichi Kumagai, Sigenori Tsuji, Masatsune Kato, Yoji Koike

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105 Citations (Scopus)

Abstract

Carrier doping effects on spin dynamics in Sr14-xAxCu24O41 (A = Ca, Y, and La) are investigated by Cu NMR and NQR. The energy gaps in the spin excitation spectra (spin gap) are confirmed to be Δ = 140K for the CuO2 chain and Δ = 470K for the Cu2O3 ladder in Sr14Cu24O41. The spin gap for the ladder increases with the Y and La substitutions for Sr (up to x = 3), while it decreases with increasing x in Sr14-xAxCu24O41 and seems to collapse around x = 13 of the Ca substitution. Hole-doping effects on the spin gaps for the ladder configuration are interpreted in terms of magnon and hole-depairing excitations for the spin S = 1/2 ladder.

Original languageEnglish
Pages (from-to)1992-1995
Number of pages4
JournalPhysical review letters
Volume78
Issue number10
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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