Charge disproportionation in the spin-liquid candidate κ – ( ET ) 2 Cu 2 ( CN ) 3 at 6&nbsp;K revealed by Cu 63 NQR measurements

Kobayashi, T.; Ding, Q. -P.; Taniguchi, H.; Satoh, K.; Kawamoto, A.; Furukawa, Y.

doi:10.1103/PhysRevResearch.2.042023

Charge disproportionation in the spin-liquid candidate $κ - {(ET)}_{2} {Cu}_{2} {(CN)}_{3}$ at 6 K revealed by ${}^{63}{Cu}$ NQR measurements

Journal Article · Fri Oct 30 04:00:00 EDT 2020 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.2.042023· OSTI ID:1694258

; ; ; ; ;

The spin-liquid candidate

κ - {(ET)}_{2} {Cu}_{2} {(CN)}_{3}

[ET: bis(ethylenedithio)tetrathiafulvalene] does not exhibit magnetic ordering down to a very low temperature, but shows a mysterious anomaly at 6 K. The origin of the so-called 6-K anomaly is still under debate. We carried out nuclear quadrupole resonance (NQR) measurements on the copper sites of the insulating layers, which are sensitive to the charge dynamics unlike conventional spin-

1 / 2

nuclear magnetic resonance (NMR). The main finding of this Rapid Communication is that the observation of a sharp peak behavior in the nuclear spin-lattice relaxation rate

T_{1}^{- 1}

{}_{63}{Cu}

NQR at 6 K while

T_{1}^{- 1}

of both

{}_{13}C

and

{}_{1}H

NMR show no clear anomaly. This behavior can be understood as a second-order phase transition related to charge disproportionation in the ET layers.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC02-07CH11358; AC02-07CH11358

OSTI ID:: 1694258

Alternate ID(s):: OSTI ID: 1700697

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 4 Vol. 2; ISSN 2643-1564; ISSN PPRHAI

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Charge disproportionation in the spin-liquid candidate κ – ( ET ) 2 Cu 2 ( CN ) 3 at 6 K revealed by Cu 63 NQR measurements

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References (50)

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Charge disproportionation in the spin-liquid candidate $κ - {(ET)}_{2} {Cu}_{2} {(CN)}_{3}$ at 6 K revealed by ${}^{63}{Cu}$ NQR measurements