Structural and unique magnetic properties of PrBa2Fe3O8

Article

关键词: HEAT;    MOSSBAUER;    ORDER;   

DOI  :  10.1103/PhysRevB.54.11999

来源: SCIE

【 摘 要 】

Tetragonal PrBa2Fe3O8 exhibits a unique magnetic behavior and behaves differently from both PrBa2Cu3O7 and all RBa(2)Fe(3)O(8) materials. Magnetic-susceptibility study reveals two anomalies at 23 and 55 K which are sensitive to oxygen concentration, but no specific heat anomaly was observed at either temperature. Mossbauer studies reveal two inequivalent iron sites, which order antiferromagnetically at approximate to 230 K, in contrast to 670 K in RBa(2)Fe(3)O(8). X-ray absorption spectra indicate that Pr is trivalent. In contrast to PrBa2Cu3O7 [T-N(Pr)=17 K] Pr in PrBa2Fe3O8 does not order magnetically. The anomalies at 23 and 55 K are probably related to spin reorientation of Fe moments.

【 授权许可】

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