Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7

被引：485

作者：

Fennell, T. ^{[1
]}

Deen, P. P.

Wildes, A. R.

Schmalzl, K. ^{[1
]}

Prabhakaran, D. ^{[2
]}

Boothroyd, A. T. ^{[2
]}

Aldus, R. J. ^{[3
,4
]}

McMorrow, D. F. ^{[3
,4
]}

Bramwell, S. T. ^{[3
,4
]}

机构：

[1] Forschungszentrum Julich, Inst Max Von Laue Paul Langevin, Inst Festkorperforsch,Julich Ctr Neutron Sci, F-38042 Grenoble, France

[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[3] UCL, Dept Phys & Astron, London WC1H 0AH, England

[4] UCL, London Ctr Nanotechnol, London WC1H 0AH, England

来源：

SCIENCE | 2009年 / 326卷 / 5951期

基金：

英国工程与自然科学研究理事会; 英国科学技术设施理事会;

关键词：

FLUCTUATIONS; ENTROPY;

D O I：

10.1126/science.1177582

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Spin-ice materials are magnetic substances in which the spin directions map onto hydrogen positions in water ice. Their low-temperature magnetic state has been predicted to be a phase that obeys a Gauss' law and supports magnetic monopole excitations: in short, a Coulomb phase. We used polarized neutron scattering to show that the spin-ice material Ho2Ti2O7 exhibits an almost perfect Coulomb phase. Our result proves the existence of such phases in magnetic materials and strongly supports the magnetic monopole theory of spin ice.

引用

页码：415 / 417

页数：3

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