Abstract
The thermal spin transition which occurs in the polymeric chain compound [Fe(NH 2trz) 3](NO 3) 2 above room temperature has been investigated by zero-field muon spin relaxation (μSR) (∼8–402 K). The depolarization curves are best described by a Lorentzian and a Gaussian line that represent fast and slow components respectively. The spin transition is associated with a hysteresis loop of width Δ T = 3 4 K ( T 1 / 2 ↑ = 3 4 6 K and T 1 / 2 ↓ = 3 1 2 K ) that has been delineated by the temperature variation of the initial asymmetry parameter. Comparison of zero-field and transverse field (20 Oe) μSR measurements shows that diamagnetic muon species occur over the entire temperature range, a large fraction of muons being however paramagnetic.
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