Field-induced length changes in the spin-liquid candidate kappa{BEDT-TTF){<_2}Cu{<_2}(CN){<_3}.
- Materials Science Division
Measurements of the coefficient of thermal expansion on the spin-liquid candidate {kappa}-(BEDT-TTF){sub 2}Cu{sub 2}(CN){sub 3} have revealed distinct and strongly anisotropic lattice effects around 6 K - a possible spin liquid instability. In order to study the effects of a magnetic field on the low-temperature spin-liquid state, dilatometric measurements have been conducted both as a function of temperature at B = const. and as a function of field at T = const. While the 6 K anomaly is found to be insensitive to magnetic fields B {le} 10 T, the maximum field applied, surprisingly strong B-induced effects are observed for magnetic fields applied along the in-plane b-axis. Above a threshold field of 0.5 T < B{sub c} {le} 1 T, a jump-like anomaly is observed in the b-axis lattice parameter. This anomaly, which is located at 8.7 K at B = 1 T, grows in size and shifts to lower temperatures with increasing the magnetic field. Although the anomaly bears resemblance to a first-order phase transition, the lack of hysteresis suggests otherwise.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); German Science Foundation
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1047447
- Report Number(s):
- ANL/MSD/JA-71074; TRN: US201216%%293
- Journal Information:
- Physics Status Solidi C, Vol. 9, Issue 5; ISSN 1610-1634
- Country of Publication:
- United States
- Language:
- ENGLISH
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