SPIN-PHONON RENORMALIZATION OF THE EXCITATION-ENERGY IN A DILUTE 2-DIMENSIONAL ANTIFERROMAGNET

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	SPIN-PHONON RENORMALIZATION OF THE EXCITATION-ENERGY IN A DILUTE 2-DIMENSIONAL ANTIFERROMAGNET
	X. B. Wang; J. X. Li; Q. Jiang; Z. H. Zhang; D. C. Tian
	1994
发表期刊	Physical Review B
ISSN	0163-1829
卷号	50 期号:10 页码:7056-7064
摘要	The contribution of spin-lattice coupling to the phonon self-energy is calculated in a dilute two-dimensional antiferromagnet. The calculations are based on a bond percolation model of the CuO2 plane of high-T(c) copper oxides recently proposed by some of the authors. Numerical results are presented for the dampings of phonon excitations relating to three different situations. They are two magnons (Case A), one magnon and one fracton (Case B), and two fractons (Case C) involved in the phonon self-energy process. At low temperatures, the damping rate is much smaller than the frequency of excitations, leading to well-defined phonons for all the cases. The overall features of the GAMMA(q) approximately q curves possess similar characteristics: GAMMA(q) increases linearly with q in the small-q region, reaching a maximum at an intermediate q, and after that scales nearly as q-2 until q approaches the edge of the Brillouin zone. The temperature-dependent phonon linewidths arising from spin-lattice coupling are also presented. We point out the sensitivity of the interaction involving fractons on bond concentration of the network. Relevance of the calculated results to experimental data are discussed.
部门归属	acad sinica,int ctr mat phys,shenyang 110015,peoples r china.;wang, xb (reprint author), wuhan univ,dept phys,wuhan 43007i,peoples r china
关键词	High-tc Superconductors Low-temperatures Normal-state Heisenberg-antiferromagnet Thermal-conductivity Medium Approximation Amorphous Materials Gap Fluctuations Resistivity
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38941
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. B. Wang,J. X. Li,Q. Jiang,et al. SPIN-PHONON RENORMALIZATION OF THE EXCITATION-ENERGY IN A DILUTE 2-DIMENSIONAL ANTIFERROMAGNET[J]. Physical Review B,1994,50(10):7056-7064.
APA	X. B. Wang,J. X. Li,Q. Jiang,Z. H. Zhang,&D. C. Tian.(1994).SPIN-PHONON RENORMALIZATION OF THE EXCITATION-ENERGY IN A DILUTE 2-DIMENSIONAL ANTIFERROMAGNET.Physical Review B,50(10),7056-7064.
MLA	X. B. Wang,et al."SPIN-PHONON RENORMALIZATION OF THE EXCITATION-ENERGY IN A DILUTE 2-DIMENSIONAL ANTIFERROMAGNET".Physical Review B 50.10(1994):7056-7064.