The tunable quantum spin ladder Cu(Qnx)(Cl(1-x)Brx)2

被引：8

作者：

Povarov, K. Yu. ^{[1
,3
]}

Lorenz, W. E. A. ^{[1
]}

Xiao, F. ^{[2
]}

Landee, C. P. ^{[2
]}

Krasnikova, Y. ^{[3
,4
]}

Zheludev, A. ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Solid State Phys Lab, Zurich, Switzerland

[2] Clark Univ, Dept Phys, Worcester, MA 01610 USA

[3] RAS, PL Kapitza Inst Phys Problems, Moscow 119334, Russia

[4] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 370卷

关键词：

Spin ladders; Bond disorder; MAGNETS;

D O I：

10.1016/j.jmmm.2014.06.060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magnetic, specific heat and ESR measurements on a series of S=1/2 spin ladder compounds Cu(Qnx)(Cl(1-x)Brx)(2). Down to T=2 K all the observables can be described by the spin ladder model with about 1% of S=1/2 impurities in the background, which are present even in a nominally pure Cu(Qnx)Cl-2 and Cu(Qnx)Br-2, for the whole range of 0 <= x <= 1. We extract ladder exchange constants J(l)(x) and J(r)(x) as well as the gap value Delta(x) by comparing the experimental data to quantum Monte-Carlo simulations. As the ESR measurements show the g-factor of impurities to be precisely equal to g-factor of the ladder spins, we suppose the impurities to be the consequence of structural defects resulting in broken ladder ends. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：62 / 67

页数：6

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