Mossbauer studies of the superconducting cobalt/nickel-doped BaFe2As2. Whither go the injected electron(s)?

被引：23

作者：

Khasanov, Airat ^{[1
]}

Bhargava, Satish C. ^{[1
]}

Stevens, John G. ^{[1
]}

Jiang, Jianyi ^{[2
]}

Weiss, Jeremy D. ^{[2
]}

Hellstrom, Eric E. ^{[2
]}

Nath, Amar ^{[1
]}

机构：

[1] Univ N Carolina, Dept Chem, Asheville, NC 28804 USA

[2] Florida State Univ, Ctr Appl Superconduct, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2011年 / 23卷 / 20期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1088/0953-8984/23/20/202201

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Mossbauer studies of cobalt-and nickel-doped BaFe2As2 show that the s-electron density at the Fe-57 nuclei, as measured by the isomer shift, is the same as that for the parent BaFe2As2. Apparently, the electron population of the d shell, which shields the s-electron density at the nuclei, remains unchanged. We invoke the involvement of p-orbital hybridization with the d orbital in Fe-As bonding. Furthermore, the shrinkage of the lattice on substitution enhances the As-As sp hybridization, providing a path for the migration of additional electrons. The proposed mechanism is consistent with Hall coefficient and thermoelectric effect measurements.

引用

页数：3

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