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arXiv 0903.2570cond-mat.str-elcond-mat.supr-con
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URu2Si2中的无公度自旋共振

Incommensurate spin resonance in URu2Si2

A. V. Balatsky, A. Chantis, Hari P. Dahal, David Parker, J. -X. Zhu

摘要:

我们重点关注$URu_2Si_2$中的非弹性中子散射,并认为费米子谱中观察到的能隙自然会导致在能量$ω_{res} = 4-6 meV$和动量$\bQ^* = (1\pm 0.4, 0,0)$处观察到的自旋特征。我们讨论了如何在$URu_2Si_2$中看到的自旋特征确实可以被认为是在HO状态下发展的{ \em自旋共振},并且{ \em无关}在1.5K的超导转变。在我们的分析中,我们假设HO间隙是由于粒子-空穴凝聚,连接嵌套的费米面与嵌套矢量$\bf{Q}^* $的部分。用这种方法可以预测$\bQ^*$的自旋磁化率行为,发现它与高温$_c$和重费米子超导体中的共振峰现象惊人地相似。共振峰的能量与$T_{HO}$ $ω_{res} \simeq 4 k_BT_{HO}$成比例。我们讨论了自旋共振对中子散射和局域态密度的影响。

英文摘要:

We focus on inelastic neutron scattering in $URu_2Si_2$ and argue that observed gap in the fermion spectrum naturally leads to the spin feature observed at energies $ω_{res} = 4-6 meV$ at momenta at $\bQ^* = (1\pm 0.4, 0,0)$. We discuss how spin features seen in $URu_2Si_2$ can indeed be thought of in terms of {\em spin resonance} that develops in HO state and is {\em not related} to superconducting transition at 1.5K. In our analysis we assume that the HO gap is due to a particle-hole condensate that connects nested parts of the Fermi surface with nesting vector $\bf{Q}^* $. Within this approach we can predicted the behavior of the spin susceptibility at $\bQ^*$ and find it to be is strikingly similar to the phenomenology of resonance peaks in high-T$_c$ and heavy fermion superconductors. The energy of the resonance peak scales with $T_{HO}$ $ω_{res} \simeq 4 k_BT_{HO}$. We discuss observable consequences spin resonance will have on neutron scattering and local density of states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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