mu SR and neutron diffraction studies on the tuning of spin-glass phases in the partially ordered double perovskites SrMn1-xWxO3

Article

关键词: MAGNETIC-PROPERTIES;    CONCENTRATION-DEPENDENCE;    CRITICAL-BEHAVIOR;    ZERO-FIELD;    CRYSTAL;    RELAXATION;    CUMN;    STATE;    SUSCEPTIBILITY;    TEMPERATURE;   

DOI  :  10.1103/PhysRevB.99.214421

来源: SCIE

【 摘 要 】

We have studied the partially ordered double perovskite (PODP) and spin-glass phase in Sr(Mn1-xWx)O-3 (x = 0.20 to 0.40) using neutron powder diffraction (NPD), muon spin relaxation (mu SR), magnetic susceptibility (chi), and x-ray photoelectron spectroscopy measurements. Structural studies reveal that SrMn1-xWxO3 undergoes a quasicontinuous transformation from simple perovskite (Pm-3m) to PODP (P2(1)/n) phase as x increases. chi(dc)(T) and chi(ac)(T) measurements show a sharp cusplike peak at spin-glass transition T-g. The muon relaxation rate (lambda) peaks at T-g following a critical growth, given by lambda = lambda(0)tau(-w)[tau = (T-T-g)/T-g]. No long-range magnetic order is observed in NPD below T-g. These measurements confirm a tunable spin-glass state of SrMn1-xWxO3 for 0.2 < x < 0.4. The spin-glass phase appears with the onset of Mn2+ cations, which induce competing ferro-antiferro interactions leading to exchange frustration. The T-g decreases as the W content and Mn2+ concentration increase. Our results suggest that the spin-glass phase can be tuned through the relative concentration of 2+, 3+, and 4+ Mn ions.

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