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Low-energy structure of the homometallic intertwining double-chain ferrimagnets A3Cu3(PO4)4 (A=Ca,Sr,Pb)
| Title: | Low-energy structure of the homometallic intertwining double-chain ferrimagnets A3Cu3(PO4)4 (A=Ca,Sr,Pb) |
| Authors: | Yamamoto, Shoji Browse this author | | Ohara, Jun Browse this author |
| Issue Date: | Jul-2007 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 76 |
| Issue: | 1 |
| Start Page: | 014409 |
| Publisher DOI: | 10.1103/PhysRevB.76.014409 |
| Abstract: | Motivated by the homometallic intertwining double-chain ferrimagnets A3Cu3(PO4)4 (A=Ca,Sr,Pb), we investigate the low-energy structure of their model Hamiltonian H = Σ n[J1(Sn:1+Sn:3)+J2(Sn+1:1+Sn−1:3)]･Sn:2, where Sn:l stands for the Cu2+ ion spin labeled l in the nth trimer unit, with particular emphasis on the range of bond alternation 0<J2/J1<1. Although the spin-wave theory, whether up to O(S1) or up to O(S0), claims that there exists a flatband in the excitation spectrum regardless of bond alternation, a perturbational treatment, as well as the exact diagonalization of the Hamiltonian, reveals its weak but nonvanishing momentum dispersion unless J2=J1 or J2=0. Quantum Monte Carlo calculations of the static structure factor further convince us of the low-lying excitation mechanism, elucidating similarities and differences between the present system and alternating-spin linear-chain ferrimagnets. |
| Rights: | Copyright © 2007 American Physical Society |
| Relation: | http://www.aps.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/30117 |
| 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: 山本 昌司
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