Finite-temperature transitions in dipolar spin ice in a large magnetic field

被引：71

作者：

Ruff, JPC ^{[1
]}

Melko, RG

Gingras, MJP

机构：

[1] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.95.097202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use Monte Carlo simulations to identify the mechanism that allows for phase transitions in dipolar spin ice to occur and survive for an applied magnetic field H much larger in strength than that of the spin-spin interactions. In the most generic and highest symmetry case, the spins on one out of four sublattices of the pyrochlore decouple from the total local exchange+dipolar+applied field. In the special case where H is aligned perfectly along the [110] crystallographic direction, spin chains perpendicular to H show a transition to q=X long-range order, which proceeds via a one- to three-dimensional crossover. We propose that these transitions are relevant to the origin of specific heat features observed in powder samples of the Dy2Ti2O7 spin ice material for H above 1 Tesla.

引用

页数：4

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