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Titolo:
Spin-phonon renormalization of the excitation energy in a diluted two-dimensional ferromagnet
Autore:
Xiong, G; Wang, XB; Zhang, ZH; Tian, DC;
Indirizzi:
Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China Wuhan Univ Wuhan Peoples R China 430072 s, Wuhan 430072, Peoples R China Int Ctr Mat Phys, Shenyang 110015, Peoples R China Int Ctr Mat Phys Shenyang Peoples R China 110015 110015, Peoples R China Tsing Hua Univ, Adv Res Ctr, Beijing 100084, Peoples R China Tsing Hua Univ Beijing Peoples R China 100084 ng 100084, Peoples R China
Titolo Testata:
COMMUNICATIONS IN THEORETICAL PHYSICS
fascicolo: 3, volume: 32, anno: 1999,
pagine: 345 - 350
SICI:
0253-6102(19991030)32:3<345:SROTEE>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC EXCITATIONS; MEDIUM APPROXIMATION; FRACTAL NETWORKS; LOW-TEMPERATURES; NORMAL-STATE; TC; SUPERCONDUCTORS; RESISTIVITY; SCATTERING; ELECTRONS;
Keywords:
diluted two-dimensional ferromagnet; phonon self-energy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Xiong, G Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China Wuhan Univ Wuhan Peoples R China 430072 430072, Peoples R China
Citazione:
G. Xiong et al., "Spin-phonon renormalization of the excitation energy in a diluted two-dimensional ferromagnet", COMM TH PHY, 32(3), 1999, pp. 345-350

Abstract

The contribution of spin-lattice coupling to the phonon self-energy is calculated for a diluted two-dimensional "soft" ferromagnet. The calculations are based on a bond percolation model. Numerical results are presented for the dampings of phonon excitations. At low temperature, the damping rate ismuch smaller than the frequency of excitations, leading to well-defined phonons. The overall features of the Gamma(q) curves possess similar characteristics: Gamma(q) has two maximum points at qa approximate to 0.5 and qa approximate to 1.7, the value of the latter is much larger than the former. The temperature-dependent phonon line widths arising from spin-lattice coupling are also presented. We point out the sensitivity of the interaction on bond concentration of the network.

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Documento generato il 25/11/20 alle ore 00:45:54