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NMR Study of Carrier Doping Effects on Spin Gaps in the Spin Ladder Sr14-xAxCu24O41 (A = Ca, Y, and La)
| Title: | NMR Study of Carrier Doping Effects on Spin Gaps in the Spin Ladder Sr14-xAxCu24O41 (A = Ca, Y, and La) |
| Authors: | Kumagai, Ken-ichi1 Browse this author →KAKEN DB | | Tsuji, Sigenori Browse this author | | Kato, Masatsune Browse this author | | Koike, Yoji Browse this author |
| Authors(alt): | 熊谷, 健一1 |
| Issue Date: | Mar-1997 |
| Publisher: | American Physical Society |
| Journal Title: | PHYSICAL REVIEW LETTERS |
| Volume: | 78 |
| Issue: | 10 |
| Start Page: | 1992 |
| End Page: | 1995 |
| Publisher DOI: | 10.1103/PhysRevLett.78.1992 |
| 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 = 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. |
| Rights: | Copyright © 1997 American Physical Society |
| Relation: | http://www.aps.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/5895 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 熊谷 健一
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