【摘要】 本文研究了YB_a2Cu（2.88）Fe（0.12）O_7-8超导氧化物在78～300K 温度区间的穆斯堡尔效应。我们发现当温度降至130K 附近时,三个晶位上的（57）^Fe 的四极裂距明显增加,且随温度降低继续增大。它们的同质异能移位则在130K 附近明显下降,在110K 附近降到最低点。我们认为导致这些变化的原因是:晶格的正交畸变明显增大,氧在Cu-O 平面排列的有序度增加。更多还原

【Abstract】 We have studied Mossbauer spectra of YBa₂Cu_2.88Fe₍0.12_O7-8 su-perconductive oxide in temperature range 78-300K.We found that when temp-erature decreases to about 130K,the electric quadrupole splitting of ⁵⁷Fe atthree sublattices increase obviously and their isomer shifts decrease and reachminimum near 110K.We suggest that the reason for these is that the orthorh-ombic distortion increases and oxygen atoms in Cu-O planes get more orderlyin superconductive phases when temperature decreases to about 130K.更多还原