Quantum melting of magnetic order in an organic dimer Mott-insulating system

Makoto Naka, Sumio Ishihara

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Abstract

Quantum entanglement effects between the electronic spin and charge degrees of freedom are examined in an organic molecular solid, termed a dimer Mott-insulating system, in which molecular dimers are arranged in a crystal as fundamental units. A low energy effective model includes an antisymmetric exchange interaction, as one of the dominant magnetic interactions. This interaction favors a 90 deg spin configuration, and competes with the Heisenberg-type exchange interaction. Stabilities of the magnetic ordered phases are examined by using the spin-wave theory, as well as the Schwinger-boson theory. It is found that the spin-charge interaction promotes an instability of the long-range magnetic ordered state around a parameter region where two spin-spiral phases are merged. Implication for the quantum spin liquid state observed in κ-(BEDT-TTF)2Cu2(CN)3 is discussed.

Original languageEnglish
Article number195114
JournalPhysical Review B
Volume93
Issue number19
DOIs
Publication statusPublished - 2016 May 9
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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