NMR Study of Carrier Doping Effects on Spin Gaps in the Spin Ladder Sr14-xAxCu24O41 (A = Ca, Y, and La)

Kumagai, Ken-ichi; Tsuji, Sigenori; Kato, Masatsune et al.

PHYSICAL REVIEW LETTERS, 1997, 78(10), 1992-1995

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URI	https://hdl.handle.net/2115/5895
タイトル	NMR Study of Carrier Doping Effects on Spin Gaps in the Spin Ladder Sr14-xAxCu24O41 (A = Ca, Y, and La)
著者	Kumagai, Ken-ichi ; Tsuji, Sigenori ; Kato, Masatsune ; Koike, Yoji
e-Rad_Researcher 70029560 著者名 Kumagai, Ken-ichi 熊谷, 健一
著者名 Tsuji, Sigenori
著者名 Kato, Masatsune
著者名 Koike, Yoji
言語	英語
発行日	1997-03
出版者	American Physical Society
収録物名	PHYSICAL REVIEW LETTERS
巻(号)	78(10)
ページ	1992-1995
抄録	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 = 140 K for the CuO2 chain and Δ = 470 K 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-xCaxCu24O41 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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Copyright © 1997 American Physical Society
PISSN	0031-9007
関連情報	URI http://www.aps.org/
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1103/PhysRevLett.78.1992