Quantum Criticality and Spin-Lattice Decoupling in an Organic Spin-Liquid Insulator

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  • 有機スピン液体物質における量子臨界現象とスピン–格子デカップリング現象の発見
  • ユウキ スピン エキタイ ブッシツ ニ オケル リョウシ リンカイ ゲンショウ ト スピン-コウシ デカップリング ゲンショウ ノ ハッケン

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Abstract

<p>A quantum spin liquid (QSL) is an exotic state of matter in condensed-matter systems, where the electron spins are strongly correlated, but conventional magnetic orders are suppressed down to zero temperature because of strong quantum fluctuations. One of the most prominent features of a QSL is the presence of fractionalized spin excitations, called spinons. Despite extensive studies, the nature of the spinons is still highly controversial. Here we show quantum-critical scaling of magnetic susceptibility, and spin-lattice decoupling phenomena in the QSL state of an organic triangular-lattice magnet, κ-(BEDT-TTF)2 Cu2(CN)3 . The decoupling phenomena can explain seeming discrepancy between gapped and gapless features of spin excitations in the QSL state. The critical exponent obtained by the scaling greatly constrains the theoretical models for the QSL, and at present, there is no theory to explain the values, to the best of our knowledge.</p>

Journal

  • Butsuri

    Butsuri 74 (7), 483-488, 2019-07-05

    The Physical Society of Japan

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