μ⁺SR Study on Layered Chromium Perovskites: Sr_n+1Cr_nO_3n+1 (n = 1–3)

Abstract

The magnetic nature of layered chromium perovskites, Sr_n+1Cr_nO_3n+1 (n = 1–3) was studied by μ⁺SR using powder samples prepared by a high pressure synthesis technique. According to the weak transverse field measurements, each sample entered a magnetically ordered state below 110, 200, and 90 K for the n = 1, 2, and 3 samples, respectively. Zero field (ZF) spectra below the transition temperature exhibited a clear oscillation due to the formation of quasi-static magnetic order. The Fourier transform frequency-spectrum for the ZF time-spectrum indicated the existence of the multiple oscillation components. The frequencies for the multiple oscillatory signals showed a complex temperature dependence, implying the occurrence of structural change/transitions below T_N.