Abstract
μSR studies in zero, longitudinal and transverse fields were carried out in the temperature range between 2 and 150 K on a polycrystalline powder sample. The data confirm the presence of two magnetic states, but each contains differently correlated spins. A first magnetic transition commences near 11 K and extends down to 7.5 K. In this temperature range a gradual formation of short-range correlated spins is seen which coexist with spins keeping their paramagnetic nature. The rate of formation is maximal around 8.5 K, which is probably the cause for a peak seen previously in specific heat data. A second transition seen in specific heat at 7.4 K signals, according to the μSR data, the long-range ordering of the remaining paramagnetic fraction. The short-range ordered fraction begins to lose its spin dynamics and ends in a spin frozen state around 3.5 K. Whether the two magnetic surroundings (short- and long-range ordered) sensed by the muons at T⪡7.5 K reflect a magnetically inhomogeneous material or whether a homogeneous spin structure with only partially long-range ordered spins exists cannot be decided at this stage and calls for magnetic diffraction data.
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