From Spin Glass to Quantum Spin Liquid Ground States in Molybdate Pyrochlores

被引：53

作者：

Clark, L. ^{[1
]}

Nilsen, G. J. ^{[2
]}

Kermarrec, E. ^{[1
]}

Ehlers, G. ^{[3
]}

Knight, K. S. ^{[4
]}

Harrison, A. ^{[5
,6
,7
]}

Attfield, J. P. ^{[5
,6
]}

Gaulin, B. D. ^{[1
,8
,9
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

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

[3] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

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

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

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

[7] Diamond Light Source, Didcot OX11 0QX, Oxon, England

[8] Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada

[9] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 11期

基金：

加拿大自然科学与工程研究理事会; 英国工程与自然科学研究理事会;

关键词：

ANTIFERROMAGNET Y2MO2O7; ABSORPTION CORRECTION; MAGNETIC SCATTERING; FRUSTRATED MAGNETS; POLARIZED NEUTRONS; BEHAVIOR; MULTIDETECTOR; Y1-XSCXMN2; FREEDOM; SM3SE4;

D O I：

10.1103/PhysRevLett.113.117201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present new magnetic heat capacity and neutron scattering results for two magnetically frustrated molybdate pyrochlores: S = 1 oxide Lu2Mo2O7 and S = 1/2 oxynitride Lu2Mo2O5N2. Lu2Mo2O7 undergoesa transition to an unconventional spin glass ground state at T-f similar to 16 K. However, the preparation of the corresponding oxynitride tunes the nature of the ground state from spin glass to quantum spin liquid. The comparison of the static and dynamic spin correlations within the oxide and oxynitride phases presented here reveals the crucial role played by quantum fluctuations in the selection of a ground state. Furthermore, we estimate an upper limit for a gap in the spin excitation spectrum of the quantum spin liquid state of the oxynitride of Delta similar to 0.05 meV or Delta/vertical bar theta vertical bar similar to 0.004, in units of its antiferromagnetic Weiss constant. theta similar to -121 K.

引用

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