Spin-Peierls Gap and Two-Magnetic-Excitation Bound and Resonant States in Cu1-xZnxGeO3 and CuGe1-ySiyO3.
作者： Tomoyuki Sekine , Haruhiko Kuroe , Jun-ichi Sasaki , Yoshitaka Sasago , Naoki Koide
DOI: 10.1143/JPSJ.67.1440
关键词:
摘要: We study a spin-Peierls gap and bound resonant states of two magnetic excitations in Cu 1- x Zn GeO 3 CuGe y Si O . Breakdown the selection rule doped samples enables us to observe excitation first-order Raman process. It is found that this shifts lower frequency merges into tail elastic scattering together with its line broadening increasing dopant concentration. The state particle-hole pair observed just below bottom second-order band pure CuGeO changes disappears rapidly as concentration increased, owing weakening attractive interaction extreme increase dampings excitations. These features are demonstrated theoretically by using Green's function.
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sci-hub.se 参考文章(45)
Masashi Hase, Kunimitsu Uchinokura, Robert J. Birgeneau, Kazuma Hirota, Gen Shirane, Neutron-scattering study of magnetism in single-crystal Cu1-xZnxGeO3 Journal of the Physical Society of Japan. ,vol. 65, pp. 1392- 1398 ,(1996) , 10.1143/JPSJ.65.1392
SB Oseroff, SW Cheong, B Aktas, MF Hundley, Z Fisk, LW Rupp Jr, None, Spin-Peierls state versus Néel state in doped CuGeO3. Physical Review Letters. ,vol. 74, pp. 1450- 1453 ,(1995) , 10.1103/PHYSREVLETT.74.1450
A. R. Goñi, T. Zhou, U. Schwarz, R. K. Kremer, K. Syassen, Pressure-Temperature Phase Diagram of the Spin-Peierls Compound CuGeO3. Physical Review Letters. ,vol. 77, pp. 1079- 1082 ,(1996) , 10.1103/PHYSREVLETT.77.1079
J. P. Pouget, L. P. Regnault, M. Ain, B. Hennion, J. P. Renard, P. Veillet, G. Dhalenne, A. Revcolevschi, Structural Evidence for a Spin Peierls Ground state in the Quasi-One-Dimensional Compound CuGeO3 Physical Review Letters. ,vol. 72, pp. 4037- 4040 ,(1994) , 10.1103/PHYSREVLETT.72.4037
Gernot Güntherodt, Light scattering in magnetic semiconductors Journal of Magnetism and Magnetic Materials. ,vol. 11, pp. 394- 402 ,(1979) , 10.1016/0304-8853(79)90298-1
J. Ruvalds, A. Zawadowski, Two-Phonon Resonances and Hybridization of the Resonance with Single-Phonon States Physical Review B. ,vol. 2, pp. 1172- 1175 ,(1970) , 10.1103/PHYSREVB.2.1172
Norio Ogita, Tsutomu Minami, Yoshifumi Tanimoto, Osamu Fujita, Jun Akimitsu, Peter Lemmens, Gernot Güntherodt, Masayuki Udagawa, Raman scattering study of phonon and magnetic excitations along the magnetic chain in CuGeO3 Journal of the Physical Society of Japan. ,vol. 65, pp. 3754- 3757 ,(1996) , 10.1143/JPSJ.65.3754
Masashi Hase, Naoki Koide, Kenzou Manabe, Yoshitaka Sasago, Kunimitsu Uchinokura, Akihito Sawa, Antiferromagnetic long-range order caused by nonmagnetic impurities; magnetization of single-crystal Cu1−xZnxGeO3 Physica B-condensed Matter. ,vol. 215, pp. 164- 170 ,(1995) , 10.1016/0921-4526(95)00405-X
H. Bergknoff, H. B. Thacker, Structure and Solution of the Massive Thirring Model Physical Review D. ,vol. 19, pp. 3666- 3681 ,(1979) , 10.1103/PHYSREVD.19.3666
T. Sekine, K. Uchinokura, E. Matsuura, Raman scattering from two-phonon resonance states in SrTiO3 Solid State Communications. ,vol. 18, pp. 569- 572 ,(1976) , 10.1016/0038-1098(76)91483-6