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Measurements of the coefficient of thermal expansion on the spin‐liquid candidate κ‐(BEDT‐TTF) 2 Cu 2 (CN) 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  ≤ 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 &lt;  B  c  ≤ 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. (© 2012 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)

Field‐induced length changes in the spin‐liquid candidate κ‐(BEDT‐TTF) 2 Cu 2 (CN) 3