Abstract
Muon spin relaxation (μ +SR) spectroscopy has been applied to study spin dynamics in the manganite single crystal Nd 0.5Sr 0.5MnO 3. Critical slowing down of Mn spin fluctuations has been observed above the ferromagnetic ordering temperature T C∼251 K. The dynamic critical exponent z=2.00(12), deduced from muon spin relaxation rates above T C (nonasymptotic regime) agrees with the results of 3d dipolar ferromagnets. Root-exponential relaxation is observed above 160 K and has been attributed to muon spin relaxation in local regions containing differently sized small spin clusters.
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