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A Monomer Mott Insulator (BEDT-TTF)Cu[N(CN)₂]₂ as a Potential Nodal Line System

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arxiv 2209.13996 v2 pith:LU2H36B4 submitted 2022-09-28 cond-mat.str-el

A Monomer Mott Insulator (BEDT-TTF)Cu[N(CN)₂]₂ as a Potential Nodal Line System

classification cond-mat.str-el
keywords statebedt-ttfmonomermottsusceptibilitybandcalculationsinsulator
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We report the band structure calculations and the experimental results of resistivity and magnetic susceptibility in a spin-1/2 (BEDT-TTF)$^{\bullet +}$ monomer Mott insulator (BEDT-TTF)Cu[N(CN)$_2$]$_2$. The band calculations indicate a Dirac semimetal state with nodal lines at the Fermi level. The resistivity and the magnetic susceptibility as functions of temperature are well interpreted in terms of the monomer Mott insulating state instead of the expected semimetal state probably owing to strong electron correlation. In addition, we find that an Arrhenius-type steep reduction of the paramagnetic susceptibility appears below approximately 25 K, which indicates a spin-singlet ground state.

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