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arXiv 1812.01239cond-mat.str-el
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(Cu/Fe)O5双锥尺寸和间距对稀土层状钙钛矿LaBaCuFeO5和LuBaCuFeO5磁性和介电性能的影响

Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5

Surender Lal, C. S. Yadav, K. Mukherjee

摘要:

报道了层状钙钛矿材料LnBaCuFeO 5(Ln = La和Lu)的结构、磁性和介电性能。LaBaCuFeO 5在低于60 K时由于铁磁和反铁磁交换相互作用而表现出磁性团簇玻璃行为。在磁性玻璃化转变温度附近也观察到电偶极子的玻璃化动力学。自旋和极性自由度之间的显着耦合的存在导致在LaBaCuFeO 5的多玻璃功能。LuBaCuFeO 5化合物在175 K发生了类YBaCuFeO 5的公度到非公度反铁磁转变。大的磁不可逆性低于17 K,在这种化合物表明存在强自旋各向异性。此外,在该化合物中,偶极子之间的相互作用不够强,这导致电偶极子的玻璃态动力学的缺失。两种化合物的对比行为可能是由于沿c轴的铁磁和反铁磁相互作用的变化,这是La和Lu离子半径差异引起的结构修饰的表现。

英文摘要:

We report structural, magnetic and dielectric properties of layered perovskite materials LnBaCuFeO5 (Ln = La and Lu). LaBaCuFeO5 shows magnetic cluster glass behavior below 60 K owing to the competing ferromagnetic and antiferromagnetic exchange interactions. Glassy dynamics of electric dipoles has also been observed in the vicinity of the magnetic glass transition temperature. The presence of significant coupling between spin and polar degrees of freedom results in the multiglass feature in LaBaCuFeO5. The LuBaCuFeO5 compound undergoes YBaCuFeO5 like commensurate to incommensurate antiferromagnetic transition at 175 K. Large magnetic irreversibility below 17 K in this compound suggests the presence of strong spin anisotropy. In addition, in this compound the interaction between the dipoles is not strong enough, which results in the absence of glassy dynamics of electric dipoles. The contrasting behavior of two compounds is possibly due to variation in the ferromagnetic and antiferromagnetic interactions along c-axis, which is the manifestation of structural modification arising out of the difference in the ionic radii of La and Lu.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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