三軸中子散射譜儀的建造及凝聚態(tài)物質(zhì)中磁相互作用的中子散射研究中期報(bào)告

戴鵬程

摘 要：該研究是973計(jì)劃“高通量中子散射在凝聚態(tài)物質(zhì)磁相互作用方面的前沿研究”的研究——“三軸中子散射譜儀的建造及凝聚態(tài)物質(zhì)中磁相互作用的中子散射研究中期報(bào)告”（2012CB821401）的中期報(bào)告。主要進(jìn)展包括3個(gè)部分。首先，我們基本搭建完成了“翠竹”熱中子三軸譜儀。其次，我們?cè)阼F基自旋動(dòng)力學(xué)方面取得了一些重要進(jìn)展，包括BaFe2-xNixAs2中的量子臨界性質(zhì)和低能自旋激發(fā)譜的演化，鐵基超導(dǎo)體自旋序來(lái)源的總結(jié)以及Li缺陷對(duì)LiFeAs性質(zhì)的影響。最后，在理論方面，我們提出了一種獨(dú)特的鐵基超導(dǎo)理論，對(duì)二維阻挫系統(tǒng)中的金屬-絕緣體相變也進(jìn)行了討論。

關(guān)鍵詞：鐵基超導(dǎo)體 中子散射 中子三軸譜儀

Abstract：This report is the middle term report of the sub-topic 1， The Construction of A Neutron Triple-Axis Spectrometer And Study on The Magnetic Interaction in The Condensed Matter Materials， 2012CB821401 of the 973 program， Advanced Research on The Magnetic Interactions in The Condensed Matter Materials by High-flux Neutron Scattering. The major results can be summarized into three parts. First， we have almost finished the construction of the Bamboo thermal neutron triple-axis spectrometer. Secondly， we have obtained some important results in studying the spin dynamics of the Fe-based superconductors， such as the quantum critical properties and the evolution of the low-energy spin excitations in BaFe2-xNixAs2， the review on the origin of the antiferromagnetic orders in the Fe-based superconductors， and the effect of Li deficiencies on the physical properties of LiFeAs. Thirdly， we have proposed a unique theory on the mechanism of the Fe-based superconductors and discussed the metal-insulator transition in the 2D frustrated system.

Key Words：Fe-based superconductors； Neutron scattering； Neutron triple-axis spectrometer

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