Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)₄Hg_3-δCl_8, δ=22% and κ-(ET)₄Hg_3-δBr_8, δ=11%

Abstract:

The Non-Fermi-Liquid (NFL) state has been one of central issues in the strongly correlated electrons systems. This deviates from conventional Fermi Liquid (FL) behavior. In the hole-doped triangular lattice organic metal κ-(ET)₄Hg_3-δBr₈, δ = 11% (κ-HgBr), the NFL state is observed as a linear temperature dependence of the resistivity which changed to the temperature square dependence behavior by pressure. The spin susceptibility dependence of the muon Knight shift, K(c), is not linear in the region below 50 K, unlike in other k-type organic superconductors. Furthermore, ¹³C-NMR study under pressure concluded that strong antiferromagnetic spin fluctuations (AFSF) contribute to the origin of NFL. To understand the underlying correlation of the enhanced AFSF and NFL state in k-HgBr, the K(c) plot study in the sister compound κ-(ET)₄Hg_3-δCl₈, δ=22% (κ-HgCl) which shows metal to insulator transition at T_MI ~ 20 K is desirable. In this study, we report a precise susceptibility measurement in both k-HgBr and k-HgCl. Furthermore, we summarize the c(T) data of k-HgBr and k-HgCl and discuss them from the viewpoint of the triangular and square lattice models.

• Periodical: Solid State Phenomena (Volume 345)
• Pages: 47-52
• DOI: https://doi.org/10.4028/p-1XErWQ
• Online since: July 2023
• Authors: Dita Puspita Sari*, Utami Widyaiswari, Yuta Someya, Eiki Yamada, Hiromi Taniguchi, Isao Watanabe, Yasuyuki Ishii
• Keywords: DC-Magnetic Susceptibility, Hole-Doped Metal, Non-Fermi Liquid, Organic Metal

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