Gapless Spin Liquid Ground State in the S=1/2 Vanadium Oxyfluoride Kagome Antiferromagnet [NH4]2[C7H14N][V7O6F18]

被引：123

作者：

Clark, L. ^{[1
,2
]}

Orain, J. C. ^{[3
]}

Bert, F. ^{[3
]}

De Vries, M. A. ^{[1
,2
]}

Aidoudi, F. H. ^{[4
]}

Morris, R. E. ^{[4
]}

Lightfoot, P. ^{[4
]}

Lord, J. S. ^{[5
]}

Telling, M. T. F. ^{[5
,6
]}

Bonville, P. ^{[7
]}

Attfield, J. P. ^{[1
,2
]}

Mendels, P. ^{[3
,8
]}

Harrison, A. ^{[1
,2
,9
]}

机构：

[1] Univ Edinburgh, CSEC, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Univ Paris 11, CNRS, UMR, Phys Solides Lab, F-91504 Orsay, France

[4] Univ St Andrews, Sch Chem & EaSTChem, St Andrews KY16 9ST, Fife, Scotland

[5] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[6] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[7] CEA, CNRS, Serv Phys Etat Condense, CE Saclay, F-91191 Gif Sur Yvette, France

[8] Inst Univ France, F-75005 Paris, France

[9] Inst Laue Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

LATTICE;

D O I：

10.1103/PhysRevLett.110.207208

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The vanadium oxyfluoride [NH4](2)[C7H14N][V7O6F18] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S = 1/2 kagome planes of V4+ d(1) ions with S = 1 V3+ d(2) ions located between the kagome layers. Muon spin relaxation measurements demonstrate the absence of spin freezing down to 40 mK despite an energy scale of 60 K for antiferromagnetic exchange interactions. From magnetization and heat capacity measurements we conclude that the S = 1 spins of the interplane V3+ ions are weakly coupled to the kagome layers, such that DQVOF can be viewed as an experimental model for S = 1/2 kagome physics, and that it displays a gapless spin liquid ground state.

引用

页数：5

共 33 条

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