通过超导量子磁强计(PPMS)和电子自旋共振仪(ESR)对多晶样品Pr0.5-xGdxSr0.5 MnO3 (x=0,0.1,0.2)的磁性进行了测量,观察到体系中存在Griffiths相.当Tc＜T＜T*时,样品呈现出铁磁-顺磁两相共存,从电子自旋共振中可以看出铁磁信号在T*以下开始出现,并且随着温度的降低,向低场移动,结果表明在样品中在Tc和T*之间存在Griffiths相,这是由于内部的各向异性诱发的淬态无序导致的.
The magnetic properties of Polycrystalline samples Pr0.5-xGdx Sr0.5MnO3(x=0,0.1,0.2)are studied by Superconducting quantum magnetometer (SQUID) and electron spin resonance (ESR).A Griffiths-like phase is observed in the system.In the temperature region Tc＜ T ＜ T*,the resonance signal consists of a ferromagnetic resonance line and a paramagnetic,with temperature decreases,the ferromagnetic signal moves to the low field.These results indicate that a Griffiths-like phase exists at Tc ＜ T＜ T* the samples,which is due to intrinsic inhomogeneity caused by quenched disorder.
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