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arXiv 1805.05596cond-mat.str-el
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La1-xSrxMnO3(x = 0.2,0.3)中的极化子关联和声子重整化

Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)

M. Maschek, J. -P. Castellan, D. Lamago, D. Reznik, F. Weber

摘要:

根据标准理论,铁磁锰氧化物的磁电阻大小主要取决于电子-声子耦合强度。我们发现,在La0.7Sr0.3MnO3的声子重整化是强的,尽管它的相对较小的磁阻。在这里,我们报告一个类似的非弹性中子散射调查的密切相关的化合物,La0.8Sr0.2MnO3,其中的磁阻增强的结果。我们发现类似的声子重整化和动态CE型极化子相关的La0.7Sr0.3MnO3。然而,定量比较两个样品的结果表明,只有极化子寿命与CMR的强度有很好的相关性。

英文摘要:

According to standard theory the magnetoresistance magnitude in ferromagnetic manganites crucially depends on the electron-phonon coupling strength. We showed that in La0.7Sr0.3MnO3 the phonon renormalization is strong, despite its relatively small magnetoresistance. Here, we report results of a similar inelastic neutron scattering investigation of a closely related compound, La0.8Sr0.2MnO3, where the magnetoresistance is enhanced. We find similar phonon renormalization and dynamic CE-type polaron correlations as in La0.7Sr0.3MnO3. However, quantitative comparison of the results for the two samples shows that only polaron lifetime is well correlated with the strength of the CMR.

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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