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Quantum-disordered state of magnetic and electric dipoles in an organic Mott system.


ABSTRACT: Strongly enhanced quantum fluctuations often lead to a rich variety of quantum-disordered states. Developing approaches to enhance quantum fluctuations may open paths to realize even more fascinating quantum states. Here, we demonstrate that a coupling of localized spins with the zero-point motion of hydrogen atoms, that is, proton fluctuations in a hydrogen-bonded organic Mott insulator provides a different class of quantum spin liquids (QSLs). We find that divergent dielectric behavior associated with the approach to hydrogen-bond order is suppressed by the quantum proton fluctuations, resulting in a quantum paraelectric (QPE) state. Furthermore, our thermal-transport measurements reveal that a QSL state with gapless spin excitations rapidly emerges upon entering the QPE state. These findings indicate that the quantum proton fluctuations give rise to a QSL-a quantum-disordered state of magnetic and electric dipoles-through the coupling between the electron and proton degrees of freedom.

SUBMITTER: Shimozawa M 

PROVIDER: S-EPMC5703743 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Quantum-disordered state of magnetic and electric dipoles in an organic Mott system.

Shimozawa M M   Hashimoto K K   Ueda A A   Suzuki Y Y   Sugii K K   Yamada S S   Imai Y Y   Kobayashi R R   Itoh K K   Iguchi S S   Naka M M   Ishihara S S   Mori H H   Sasaki T T   Yamashita M M  

Nature communications 20171128 1


Strongly enhanced quantum fluctuations often lead to a rich variety of quantum-disordered states. Developing approaches to enhance quantum fluctuations may open paths to realize even more fascinating quantum states. Here, we demonstrate that a coupling of localized spins with the zero-point motion of hydrogen atoms, that is, proton fluctuations in a hydrogen-bonded organic Mott insulator provides a different class of quantum spin liquids (QSLs). We find that divergent dielectric behavior associa  ...[more]

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