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Gapped magnetic ground state in quantum spin liquid candidate k-(BEDT-TTF)2Cu2(CN)3.

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Title: Gapped magnetic ground state in quantum spin liquid candidate k-(BEDT-TTF)2Cu2(CN)3.
Authors: Miksch, Björn, Pustogow, Andrej, Rahim, Mojtaba Javaheri, Bardin, Andrey A., Kanoda, Kazushi, Schlueter, John A., Hübner, Ralph, Scheffler, Marc, Dressel, Martin
Source: Science (pre-March 2025). 4/16/2021, Vol. 371 Issue 6539, p276-279. 4p. 2 Diagrams, 1 Graph.
Subjects: Quantum entanglement, Quantum optical phenomena, Quantum states, Electron paramagnetic resonance, Larmor precession, Magnetic resonance
Abstract: Geometrical frustration, quantum entanglement, and disorder may prevent long-range ordering of localized spins with strong exchange interactions, resulting in an exotic state of matter. k-(BEDT-TTF)2Cu2(CN)3 is considered the prime candidate for this elusive quantum spin liquid state, but its ground-state properties remain puzzling. We present a multifrequency electron spin resonance (ESR) study down to millikelvin temperatures, revealing a rapid drop of the spin susceptibility at 6 kelvin. This opening of a spin gap, accompanied by structural modifications, is consistent with the formation of a valence bond solid ground state. We identify an impurity contribution to the ESR response that becomes dominant when the intrinsic spins form singlets. Probing the electrons directly manifests the pivotal role of defects for the low-energy properties of quantum spin systems without magnetic order. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Gapped magnetic ground state in quantum spin liquid candidate k-(BEDT-TTF)2Cu2(CN)3.
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  Data: <searchLink fieldCode="AR" term="%22Miksch%2C+Björn%22">Miksch, Björn</searchLink><br /><searchLink fieldCode="AR" term="%22Pustogow%2C+Andrej%22">Pustogow, Andrej</searchLink><br /><searchLink fieldCode="AR" term="%22Rahim%2C+Mojtaba+Javaheri%22">Rahim, Mojtaba Javaheri</searchLink><br /><searchLink fieldCode="AR" term="%22Bardin%2C+Andrey+A%2E%22">Bardin, Andrey A.</searchLink><br /><searchLink fieldCode="AR" term="%22Kanoda%2C+Kazushi%22">Kanoda, Kazushi</searchLink><br /><searchLink fieldCode="AR" term="%22Schlueter%2C+John+A%2E%22">Schlueter, John A.</searchLink><br /><searchLink fieldCode="AR" term="%22Hübner%2C+Ralph%22">Hübner, Ralph</searchLink><br /><searchLink fieldCode="AR" term="%22Scheffler%2C+Marc%22">Scheffler, Marc</searchLink><br /><searchLink fieldCode="AR" term="%22Dressel%2C+Martin%22">Dressel, Martin</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 4/16/2021, Vol. 371 Issue 6539, p276-279. 4p. 2 Diagrams, 1 Graph.
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  Data: <searchLink fieldCode="DE" term="%22Quantum+entanglement%22">Quantum entanglement</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+optical+phenomena%22">Quantum optical phenomena</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+states%22">Quantum states</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+paramagnetic+resonance%22">Electron paramagnetic resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Larmor+precession%22">Larmor precession</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+resonance%22">Magnetic resonance</searchLink>
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  Data: Geometrical frustration, quantum entanglement, and disorder may prevent long-range ordering of localized spins with strong exchange interactions, resulting in an exotic state of matter. k-(BEDT-TTF)2Cu2(CN)3 is considered the prime candidate for this elusive quantum spin liquid state, but its ground-state properties remain puzzling. We present a multifrequency electron spin resonance (ESR) study down to millikelvin temperatures, revealing a rapid drop of the spin susceptibility at 6 kelvin. This opening of a spin gap, accompanied by structural modifications, is consistent with the formation of a valence bond solid ground state. We identify an impurity contribution to the ESR response that becomes dominant when the intrinsic spins form singlets. Probing the electrons directly manifests the pivotal role of defects for the low-energy properties of quantum spin systems without magnetic order. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: 4/16/2021
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