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	Combined study of schwinger-boson mean-field theory and linearized tensor renormalization group on heisenberg ferromagnetic mixed spin (s, sigma) chains
	Yan, Xin1; Zhu, Zhen-Gang1,2; Su, Gang1
刊名	Aip advances
	2015-07-01
卷号	5期号:7页码:17
ISSN号	2158-3226
DOI	10.1063/1.4927854
通讯作者	Zhu, zhen-gang(zgzhu@ucas.ac.cn)
英文摘要	The schwinger-boson mean-field theory (sbmft) and the linearized tensor renormalization group (ltrg) methods are complementarily applied to explore the thermodynamics of the quantum ferromagnetic mixed spin (s, sigma) chains. it is found that the system has double excitations, i.e. a gapless and a gapped excitation; the low-lying spectrum can be approximated by omega k similar to s sigma/2(s+sigma) jk(2) with j the ferromagnetic coupling; and the gap between the two branches is estimated to be delta similar to j. the bose-einstein condensation indicates a ferromagnetic ground state with magnetization m(tot)(z) = n(s + sigma). at low temperature, the spin correlation length is inversely proportional to temperature (t), the susceptibility behaviors as chi = a(1) * (1/t-2) + a(2) * (1/t), and the specific heat has the form of c = c(1) * root t - c(2) * t + c(3) * (t)(3/2), with a(i) (i = 1, 2) and c(i) (i = 1,2, 3) the temperature independent constants. the sbmft results are shown to be in qualitatively agreement with those by the ltrg numerical calculations for s = 1 and sigma = 1/2. a comparison of the ltrg results with the experimental data of the model material (mnniii)-ni-ii (no2)(4)(en)(2)(en = ethylenediamine), is made, in which the coupling parameters of the compound are obtained. this study provides useful information for deeply understanding the physical properties of quantum ferromagnetic mixed spin chain materials. (c) 2015 author(s).
WOS关键词	LOW-TEMPERATURE PROPERTIES ; BIMETALLIC CHAINS ; EXCITATIONS ; MAGNETISM ; BEHAVIOR ; SYSTEMS ; MODELS ; S=1/2
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Physics
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000358922500083
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2374048
专题	物理研究所
通讯作者	Zhu, Zhen-Gang
作者单位	1.Univ Chinese Acad Sci, Coll Phys Sci, Theoret Condensed Matter Phys & Computat Mat Phys, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Sch Elect Elect & Commun Engn, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yan, Xin,Zhu, Zhen-Gang,Su, Gang. Combined study of schwinger-boson mean-field theory and linearized tensor renormalization group on heisenberg ferromagnetic mixed spin (s, sigma) chains[J]. Aip advances,2015,5(7):17.
APA	Yan, Xin,Zhu, Zhen-Gang,&Su, Gang.(2015).Combined study of schwinger-boson mean-field theory and linearized tensor renormalization group on heisenberg ferromagnetic mixed spin (s, sigma) chains.Aip advances,5(7),17.
MLA	Yan, Xin,et al."Combined study of schwinger-boson mean-field theory and linearized tensor renormalization group on heisenberg ferromagnetic mixed spin (s, sigma) chains".Aip advances 5.7(2015):17.

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