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arXiv 1012.2300cond-mat.supr-con
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超导体FeTe0. 35 Se 0.65中局域磁矩的证据

Evidence for local moment magnetism in superconducting FeTe0.35Se0.65

Zhijun Xu, Jinsheng Wen, Guangyong Xu, Songxue Chi, Wei Ku, Genda Gu, J. M. Tranquada

摘要:

铁基超导体中磁关联的性质仍然是一个有争议的问题。为了解决这个问题,我们使用非弹性中子散射的FeTe $_{0.35}$ Se $_{0.65}$($T_c \sim 14$ K)的低能量自旋涨落的强度和温度依赖性的特征。对能量高达12 meV的磁谱加权积分,我们发现一个实质性的磁矩($\agt 0.26 μ_B/$ Fe)随温度的变化很小,从低于T $_c$到300 K。这种行为不能仅仅用传导电子的响应来解释;远离费米能的状态必须具有瞬时的局部自旋极化。它提出了有趣的问题,关于形成的自旋间隙和共振峰的超导状态。

英文摘要:

The nature of the magnetic correlations in Fe-based superconductors remains a matter of controversy. To address this issue, we use inelastic neutron scattering to characterize the strength and temperature dependence of low-energy spin fluctuations in FeTe$_{0.35}$Se$_{0.65}$ ($T_c \sim 14$ K). Integrating magnetic spectral weight for energies up to 12 meV, we find a substantial moment ($\agt 0.26 μ_B/$Fe) that shows little change with temperature, from below T$_c$ to 300 K. Such behavior cannot be explained by the response of conduction electrons alone; states much farther from the Fermi energy must have an instantaneous local spin polarization. It raises interesting questions regarding the formation of the spin gap and resonance peak in the superconducting state.

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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