Coulomb phase diagnostics as a function of temperature, interaction range, and disorder.
Coulomb phase diagnostics as a function of temperature, interaction range, and disorder.
复制标题
库仑相诊断作为温度、相互作用范围和无序的函数。
DOI：
10.1103/physrevlett.110.107202
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发表时间：
2012
影响因子：
8.6
通讯作者：
S. Sondhi
中科院分区：
文献类型：
--
作者：
Arnab Sen;R. Moessner;S. Sondhi
自旋冰库仑相的出射规范场特征通过倒易空间中自旋结构因子S中的箍缩点揭示了它的存在，在低温下，箍缩点的形式为横向投影P：S（q）~ P ~ q vertical（2）/q（2）。我们开发了一个理论，建立了命运的夹点在低温和高温下，硬和软自旋，短期和长期（偶极）的相互作用，以及在存在的障碍。我们发现它们的详细形状可以用来读出自旋冰中磁单极子的熵和磁库仑相互作用的相对大小，并且我们解决了为什么在实验中观察到Ho（1.7）Y（0.3）的夹点的问题Ti（2）O（7）即使在高温下存在强无序。
The emergent gauge field characteristic of the Coulomb phase of spin ice betrays its existence via pinch points in the spin structure factor S in reciprocal space which takes the form of a transverse projector P at low temperature: S(q) ~ P ~ q perpendicular(2)/q(2). We develop a theory which establishes the fate of the pinch points at low and high temperature, for hard and soft spins, for short- and long-ranged (dipolar) interactions, as well as in the presence of disorder. We find that their detailed shape can be used to read off the relative sizes of entropic and magnetic Coulomb interactions of monopoles in spin ice, and we resolve the question of why pinch points have been experimentally observed for Ho(1.7)Y(0.3)Ti(2)O(7) even at high temperature in the presence of strong disorder.