Brownian motion and quantum dynamics of magnetic monopoles in spin ice.
Brownian motion and quantum dynamics of magnetic monopoles in spin ice.
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DOI：
10.1038/ncomms2551
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发表时间：
2013
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
自旋冰展示了许多不寻常的磁性，包括零点熵，涌现的单极子和准液体-气体转变。揭示支撑这些现象的量子自旋动力学是一个实验挑战。在这里，我们展示了如何至关重要的信息包含在磁化率的频率依赖性，并在其高频率或绝热极限。Dy 2 Ti 2 O 7自旋冰的典型响应表明，自旋扩散是布朗的，但由自旋隧道支撑，并受到集体自旋相互作用的影响。绝热响应揭示了在弱场作用下驱动等离子体振荡和在强场作用下非常规临界行为的证据。我们的研究结果澄清了自旋冰中相对较高的频率响应的起源。他们揭示了意想不到的物理现象，并建立了绝热磁化率作为奇异自旋系统的揭示特征。 孤立的磁单极子通常是被禁止的，但在磁阻旋冰材料中可以作为准粒子出现。Bovo等人通过这些激发对钛酸镝高频磁化率的影响，探索了这些激发的经典和量子性质。
Spin ice illustrates many unusual magnetic properties, including zero point entropy, emergent monopoles and a quasi liquid–gas transition. To reveal the quantum spin dynamics that underpin these phenomena is an experimental challenge. Here we show how crucial information is contained in the frequency dependence of the magnetic susceptibility and in its high frequency or adiabatic limit. The typical response of Dy2Ti2O7 spin ice indicates that monopole diffusion is Brownian but is underpinned by spin tunnelling and is influenced by collective monopole interactions. The adiabatic response reveals evidence of driven monopole plasma oscillations in weak applied field, and unconventional critical behaviour in strong applied field. Our results clarify the origin of the relatively high frequency response in spin ice. They disclose unexpected physics and establish adiabatic susceptibility as a revealing characteristic of exotic spin systems. Isolated magnetic monopoles are usually forbidden, but can arise as quasiparticles in magnetically frustrated spin-ice materials. Bovo et al. explore the classical and quantum natures of these excitations through their influence on the high frequency magnetic susceptibility of dysprosium titanate.
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影响因子：
19.6
作者：
Giblin, S. R.;Bramwell, S. T.;Terry, I.
通讯作者：
Terry, I.
影响因子：
4.4
作者：
Cole, KS;Cole, RH
通讯作者：
Cole, RH
影响因子：
3.7
作者：
Castro Neto, A. H.;Pujol, P.;Fradkin, Eduardo
通讯作者：
Fradkin, Eduardo
影响因子：
2.7
作者：
Ehlers, G;Cornelius, AL;Gardner, JS
通讯作者：
Gardner, JS
DOI：
10.1098/rsta.2011.0596
发表时间：
2012-12-28
期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
--
作者：
Bramwell ST
通讯作者：
Bramwell ST