e⁷⁷Se NMR study of the spin density wave state in (TMTSF)₂PF₆

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• 作者：Valfells ; S. ; Kuhns ; P. ; Kleinhammes ; A. ; Moulton ; W. ; Brooks ; J.S. ; Takasaki ; S. ; Yamada ; J. ; et. al.
• 关键词：Organic conductors ; Spin Density Wave ; Nuclear Magnetic Resonance
• 刊名：Synthetic Metals
• 出版年：1997
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：February 28, 1997
• 卷：86
• 期：1-3
• 页码：2109-2110
• 文件大小：165 K

摘要

The quasi-1D conductor (TMTSF)₂PF₆, has a Spin Density Wave transition at 12 K. Previous H¹ NMR studies have shown that the spin-lattice relaxation rate, T₁, is finite and Korringa-like inside the Spin Density Wave phase down to about 4 K below which T₁ increases rapidly. We have measured the linewidth, T₁ and the spin-spin relaxation time, T₂, of the e⁷⁷Se nuclei which, as calculated by bandstructure, are in closer physical proximity to the electron conduction paths than the H¹ and, consequently, more strongly coupled to the conduction electrons. Using fields up to 24 T, we find that while the lineshape is temperature independent inside the SDW phase, the e⁷⁷Se T₁ exhibits the same qualitative behavior as the H¹ T₁, and T₂ increases abruptly at 4 K. We discuss this result in terms of the Fermi surface of the system.