Ice rule correlations in stuffed spin ice

被引：8
作者：
Aldus, R. J. [1 ,2 ,3 ]
Fennell, T. [4 ,5 ]
Deen, P. P. [5 ]
Ressouche, E. [6 ]
Lau, G. C. [7 ]
Cava, R. J. [7 ]
Bramwell, S. T. [1 ,2 ]
机构：
[1] London Ctr Nanotechnol, London WC1H 0AH, England
[2] UCL, Dept Phys & Astron, London WC1H 0AH, England
[3] Australian Nucl Sci & Technol Org, Kirrawee D C, NSW 2232, Australia
[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
[6] UMR E CEA UJF Grenoble 1, INAC, SPSMS, F-38054 Grenoble, France
[7] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
来源：
NEW JOURNAL OF PHYSICS | 2013年 / 15卷
基金：
英国工程与自然科学研究理事会;
关键词：
ZERO-POINT ENTROPY; MAGNETIC MONOPOLES; COULOMB PHASE; HO2TI2O7;
D O I：
10.1088/1367-2630/15/1/013022
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Stuffed spin ice is a chemical variation of a spin ice material like Ho2Ti2O7 in which extra magnetic ions are inserted into the crystal structure. Previous studies have shown that the degree of stuffing has very little effect on the residual entropy in the system, which takes a value very close to the spin ice entropy. We argue, however, that the observation of this entropy does not imply long range coherence of the ice rules, that determine the local spin configurations. We have characterized deviations from the ice rules by means of a polarized neutron diffraction study of a single crystal of Ho2+delta Ti2-delta O7-delta/2 with delta = 0.3. Our results demonstrate that the ice rules in stuffed spin ice are strictly valid only over a relatively short range, and that at longer range stuffed spin ice exhibits some characteristics of a 'cluster glass', with a tendency to more conventional ferromagnetic correlations.
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页数：9
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