Publication Date
10-30-2020
Department
Ames Laboratory; Physics and Astronomy
Campus Units
Ames Laboratory, Physics and Astronomy
OSTI ID+
1694258
Report Number
IS-J 10333
DOI
10.1103/PhysRevResearch.2.042023
Journal Title
Physical Review Research
Volume Number
2
Issue Number
4
First Page
042023(R)
Abstract
The spin-liquid candidate κ−(ET)2Cu2(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−11 of 63Cu NQR at 6 K while T−11 of both 13C and 1H NMR show no clear anomaly. This behavior can be understood as a second-order phase transition related to charge disproportionation in the ET layers.
Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
