Quantum electric dipoles in spin-liquid dimer Mott insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>κ</mml:mi><mml:msub><mml:mrow><mml:mtext>-ET</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>CN</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

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We present an effective dipolar-spin model based on the strong coupling analysis, which may explain the possible origin of ``spin-liquid insulator.'' The issue is related to a dimer Mott insulator reminiscent of an organic triangular lattice system, $\ensuremath{\kappa}{\text{-ET}}_{2}{\text{Cu}}_{2}{(\text{CN})}_{3}$, whose gapless spin-liquid state has been discussed in the context of geometrical frustration of exchange coupling, $J$, between spins on dimer orbitals. It turns out that another degrees of freedom within the insulator, quantum electric dipoles on dimers, interact with each other and modify $J$ significantly through the dipolar-spin coupling, resulting in a possible ``dipolar-spin liquid.''

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  • Physical Review B

    Physical Review B 82 (24), 241104-, 2010-12-22

    American Physical Society (APS)

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