TY - JOUR
T1 - Quantum-disordered state of magnetic and electric dipoles in an organic Mott system
AU - Shimozawa, M.
AU - Hashimoto, K.
AU - Ueda, A.
AU - Suzuki, Y.
AU - Sugii, K.
AU - Yamada, S.
AU - Imai, Y.
AU - Kobayashi, R.
AU - Itoh, K.
AU - Iguchi, S.
AU - Naka, M.
AU - Ishihara, S.
AU - Mori, H.
AU - Sasaki, T.
AU - Yamashita, M.
N1 - Funding Information:
We thank J. Müller, M. Oshikawa, H. Seo, T. Shibauchi, M. Tachikawa, Y. Tada, T. Tsumuraya, H. Watanabe, and K. Yamamoto for fruitful discussions. We also thank K. Torizuka and Y. Uwatoko for providing technical assistance. This work was supported by Grants-in-Aid for Scientific Research (Grants Nos. 24340074, 26287070, 26610096, 15H00984, 15H00988, 15H02100, 15K13511, 15K17691, 16H00954, 16H04010, 16K05744, 16K17731, 17H05138, 17H05143, and 17K18746) from MEXT and JSPS, by a Grant-in-Aid for Scientific Research on Innovative Areas “π-Figuration” (No. 26102001), by the Canon Foundation and by Toray Science Foundation.
Publisher Copyright:
© 2017 The Author(s).
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41467-017-01849-x
DO - 10.1038/s41467-017-01849-x
M3 - Article
C2 - 29180819
AN - SCOPUS:85035754532
SN - 2041-1723
VL - 8
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1821
ER -