文献详情
Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model: Implications for spin waves of detwinned iron pnictides
文献类型：期刊
通讯作者：Yu, R (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.; Yu, R (reprint author), Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China.
期刊名称：PHYSICAL REVIEW B影响因子和分区
年：2020
卷：101
期：2
ISSN：2469-9950
所属部门：物理学系
摘要：Elucidating the nature of spin excitations is important to understanding the mechanism of superconductivity in the iron pnictides. Motivated by recent inelastic neutron scattering measurements in the nearly 100% detwinned BaFe2As2, we study the spin dynamics of an S = 1 frustrated bilinear-biquadratic Heisenberg model in the antiferromagnetic phase with wave vector (pi, 0). The biquadratic interactions are treated in a dynamical way using a flavor-wave theory in an SU(3) representation. Besides ...More
Elucidating the nature of spin excitations is important to understanding the mechanism of superconductivity in the iron pnictides. Motivated by recent inelastic neutron scattering measurements in the nearly 100% detwinned BaFe2As2, we study the spin dynamics of an S = 1 frustrated bilinear-biquadratic Heisenberg model in the antiferromagnetic phase with wave vector (pi, 0). The biquadratic interactions are treated in a dynamical way using a flavor-wave theory in an SU(3) representation. Besides the dipolar spin wave (magnon) excitations, the biquadratic interactions give rise to quadrupolar excitations at high energies. We find that the quadrupolar wave significantly influences, in an energy dependent way, the anisotropy between the spin excitation spectra along the (pi, 0) and (0, pi) directions in the wave vector space. Our theoretical results capture the essential behavior of the spin dynamics measured in the antiferromagnetic phase of the detwinned BaFe2As2. More generally, our results underscore the importance of electron correlation effects for the microscopic physics of the iron pnictides. ...Hide

DOI：10.1103/PhysRevB.101.024510
百度学术：Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model: Implications for spin waves of detwinned iron pnictides
语言：外文
人气指数：2
浏览次数：2
基金：Ministry of Science and Technology of ChinaMinistry of Science and Technology, China [2016YFA0300504, 2016YFA0301001, 2016YFA0300500, 2018YFGH000095]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [11674392, 11734002]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities; Research Funds of Renmin University of China [18XNLG24]; US NSFNational Science Foundation (NSF) [DMR-1700081]; US Department of Energy, Office of Science, Basic Energy SciencesUnited States Department of Energy (DOE) [DE-SC0018197]; Robert A. Welch FoundationThe Welch Foundation [C-1411]
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