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

doi:10.1126/science.abc6363

GSTDTAP > 气候变化

DOI	10.1126/science.abc6363
	Gapped magnetic ground state in quantum spin liquid candidate κ-(BEDT-TTF)₂Cu₂(CN)₃
	Björn Miksch; Andrej Pustogow; Mojtaba Javaheri Rahim; Andrey A. Bardin; Kazushi Kanoda; John A. Schlueter; Ralph Hübner; Marc Scheffler; Martin Dressel
	2021-04-16
发表期刊	Science
出版年	2021
英文摘要	Quantum spin liquids avoid conventional magnetic ordering down to the lowest temperatures. Among the candidates for this state of matter, organic salts such as κ-(BEDT-TTF)2Cu2(CN)3 have been prominent. Miksch et al. studied this material using electron spin resonance to elucidate the nature of its ground state. Instead of the expected gapless state, the temperature dependence of spin susceptibility suggests the formation of a spin gap. Science , this issue p. [276][1] 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. κ-(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. [1]: /lookup/doi/10.1126/science.abc6363
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/322896
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Björn Miksch,Andrej Pustogow,Mojtaba Javaheri Rahim,et al. Gapped magnetic ground state in quantum spin liquid candidate κ-(BEDT-TTF)₂Cu₂(CN)₃[J]. Science,2021.
APA	Björn Miksch.,Andrej Pustogow.,Mojtaba Javaheri Rahim.,Andrey A. Bardin.,Kazushi Kanoda.,...&Martin Dressel.(2021).Gapped magnetic ground state in quantum spin liquid candidate κ-(BEDT-TTF)₂Cu₂(CN)₃.Science.
MLA	Björn Miksch,et al."Gapped magnetic ground state in quantum spin liquid candidate κ-(BEDT-TTF)₂Cu₂(CN)₃".Science (2021).