Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M56: Quantum Spin Liquid Materials II: Geometric Frustration, Shastry-Sutherland, and Valence Bond Solids
8:00 AM–11:12 AM,
Wednesday, March 8, 2023
Room: Room 304
Sponsoring
Unit:
GMAG
Chair: Peter Czajka, National Institute of Standards and Technology
Abstract: M56.00009 : NMR studies of the spin liquid candidate material, κ-(BEDT-TTF)2Cu2(CN)3, with varying magnetic field and pressure
10:24 AM–10:36 AM
Presenter:
Kazuya Miyagawa
(University of Tokyo)
Authors:
Kazuya Miyagawa
(University of Tokyo)
Mizuki Urai
(University of Tokyo)
Kazushi Kanoda
(University of Tokyo)
Takahiko Sasaki
(Tohoku University)
At ambient pressure, 13C NMR spectra show a significant decrease in the spin shift and a simultaneous line broadening suggestive of an inhomogeneous state below 6K. Moreover, we found that the 6K-anomaly is robust against the magnetic field up to 15Tesla. The 1/T1 at 1H sites, where the hyperfine coupling with conduction electrons is smaller than that at 13C sites, obeys similar temperature dependence to that at 13C sites down to 6K; however, below that, 1/T1 shows quite different temperature variations at the 1H and 13C sites, indicative of different relaxation mechanisms at the 13C and 1H sites at low temperatures. This can be a key to understanding the anomalous state below 6K.
With 1H NMR measurements under pressure variation, we found that the 6K-anomaly suddenly and completely disappear when the system enters into the metallic.
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