Electronic confinement and ordering instabilities in colossal magnetoresistive bilayer manganites.

Electronic confinement and ordering instabilities in colossal magnetoresistive bilayer manganites.
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巨大磁阻双层锰氧化物中的电子限制和有序不稳定性

DOI:
10.1103/physrevlett.108.016403
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发表时间:
2012
影响因子:
8.6
通讯作者:
J. Geck
J. Geck
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
J. Trinckauf;T. Hänke;V. Zabolotnyy;T. Ritschel;M. O. Apostu;R. Suryanarayanan;A. Revcolevschi;K. Koepernik;T. K. Kim;M. v. Zimmermann;S. V. Borisenko;M. Knupfer;B. Büchner;J. Geck

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我们目前的角度分辨光电发射研究与,0.2,和沿着与密度泛函理论计算和x射线散射数据。我们的研究结果表明,在这些材料的铁磁金属相的双层分裂是小的,如果不是完全不存在。因此,电荷载流子被限制在单层中,这反过来又导致了强烈的嵌套费米表面。除此之外,光谱函数还显示出远低于费米能级的电子有序不稳定性的清晰特征。相应的相互作用强度的增加和它的大小使得耦合到裸声子是非常不可能的。相反,我们得出结论,波动的顺序,涉及电子和晶格的自由度,导致所观察到的重整化的光谱特征。
We present angle-resolved photoemission studies ofwithand, 0.2, and 0.4 along with density functional theory calculations and x-ray scattering data. Our results show that the bilayer splitting in the ferromagnetic metallic phase of these materials is small, if not completely absent. The charge carriers are therefore confined to a singlelayer, which in turn results in a strongly nested Fermi surface. In addition to this, the spectral function also displays clear signatures of an electronic ordering instability well below the Fermi level. The increase of the corresponding interaction strength withand its magnitude ofmake the coupling to a bare phonon highly unlikely. Instead we conclude that fluctuating order, involving electronic and lattice degrees of freedom, causes the observed renormalization of the spectral features.
自旋涨落材料的电动力学
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
V. Stankevich;S. Kimura;他8名;T. Ito;S. Kimura
通讯作者: S. Kimura