Abstract
Magnetic properties of the S = ½ Heisenberg spin-chain material (6MAP)CuCl3 have been probed by means of magnetization, specific-heat and electron spin resonance (ESR) measurements. A pronounced low-temperature Curie-like tail in the magnetic susceptibility was found at low temperatures. As recently suggested, such a behavior could originate from staggered magnetization effects, responsible also for the field-induced gap opening in S = ½ chains with broken translational symmetry. We found a clear anomaly in the specific heat having a broad maximum at Tmax ∼ 2.3 K, accompanied by a significant ESR line broadening and g-factor shift. The specific-heat anomaly is magnetic-field independent, indicating that its origin is not related to the field-induced transverse staggered magnetization effects.
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