Superconductivity in the cuprates: Deduction of mechanism for d-wave pairing through analysis of ARPES

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	Superconductivity in the cuprates: Deduction of mechanism for d-wave pairing through analysis of ARPES
	Choi, HY ; Varma, CM ; Zhou, XJ
刊名	FRONTIERS OF PHYSICS
	2011
卷号	6 期号:4 页码:440
关键词	T-C SUPERCONDUCTOR PSEUDOGAP STATE MAGNETIC ORDER DENSITY INSTABILITY SPECTRUM PHASE
ISSN号	2095-0462
通讯作者	Choi, HY (reprint author), Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea.
中文摘要	In the Eliashberg integral equations for d-wave superconductivity, two different functions (alpha (2) F) (n) (omega, theta) and (alpha (2) F) (p,d) (omega) determine, respectively, the "normal" self-energy and the "pairing" self-energy. omega is the frequency of fluctuations scattering the fermions whose momentum is near the Fermi-surface and makes an angle theta to a chosen axis. We present a quantitative analysis of the high-resolution laser based Angle Resolved Photoemission Spectroscopy (ARPES) data on a slightly under doped cuprate compound Bi2212 and use the Eliashberg equations to deduce the omega and theta dependence of (alpha (2) F) (n) (omega, theta) for T just above T (c) and below T (c). Besides its detailed omega dependence, we find the remarkable result that this function is nearly independent of theta between the (pi; pi)-direction and 25 degrees from it, except for the dependence of the cut-off energy on theta. Assuming that the same fluctuations determine both the normal and the pairing self-energy, we ask what theories give the function (alpha (2) F) (p,d) (omega) required for the d-wave pairing instability at high temperatures as well as the deduced (alpha (2) F) (n) (theta, omega). We show that the deduced (alpha (2) F) (n) (theta, omega) can only be obtained from antiferromagnetic (AFM) fluctuations if their correlation length is smaller than a lattice constant. Using (alpha (2) F) (p,d) (omega) consistent with such a correlation length and the symmetry of matrix-elements scattering fermions by AFM fluctuations, we calculate T (c) and show that AFM fluctuations are excluded as the pairing mechanism for d-wave superconductivity in cuprates. We also consider the quantumcritical fluctuations derived microscopically as the fluctuations of the observed loop-current order discovered in the under-doped cuprates, and which lead to the marginal Fermi-liquid properties in the normal state. We show that their frequency dependence and the momentum dependence of their matrix-elements to scatter fermions are consistent with the theta and omega dependence of the deduced (alpha (2) F) (n) (omega, theta). The pairing kernel (alpha (2) F) (p,d) (omega) calculated using the experimental values in the Eliashberg equation gives d-wave instability at T (c) comparable to the experiments.
收录类别	SCI
资助信息	Division of Materials Research of the National Science Foundation
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/54056]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Choi, HY,Varma, CM,Zhou, XJ. Superconductivity in the cuprates: Deduction of mechanism for d-wave pairing through analysis of ARPES[J]. FRONTIERS OF PHYSICS,2011,6(4):440.
APA	Choi, HY,Varma, CM,&Zhou, XJ.(2011).Superconductivity in the cuprates: Deduction of mechanism for d-wave pairing through analysis of ARPES.FRONTIERS OF PHYSICS,6(4),440.
MLA	Choi, HY,et al."Superconductivity in the cuprates: Deduction of mechanism for d-wave pairing through analysis of ARPES".FRONTIERS OF PHYSICS 6.4(2011):440.