超导NdFeAsO(0.88)F(0.12)及其母体化合物NdFeAsO的穆斯堡尔研究。
Mössbauer study of superconducting NdFeAsO(0.88)F(0.12) and its parent compound NdFeAsO.
作者信息
Sánchez D R, Alzamora M, Munevar J, Wang N L, Cheng G F, Baggio-Saitovitch E
机构信息
Instituto de Física, Universidade Federal Fluminense, Avenida Milton Tavares de Souza, s/n-Campus da Praia Vermelha, 24210-346 Niterói, RJ, Brazil.
出版信息
J Phys Condens Matter. 2009 Nov 11;21(45):455701. doi: 10.1088/0953-8984/21/45/455701. Epub 2009 Oct 21.
(57)Fe Mössbauer spectroscopy has been used to investigate the magnetic order of non-superconducting NdFeAsO (T(N) = 140 K) and superconducting NdFeAsO(0.88)F(0.12) (T(c) = 45 K). A magnetic hyperfine field B(hf) was observed at the (57)Fe nucleus below T(N)∼140 K for NdFeAsO. Below ∼2 K an increase of B(hf) relative to the saturation value was attributed to the transferred B(hf) at the Fe site resulting from the collinear antiferromagnetic (AF) spin structure of the Nd moments. The analysis of the spectra is consistent with a commensurate AF order of Fe spins. No B(hf) is observed in superconducting NdFeAsO(0.88)F(0.12) down to 1.5 K.
利用穆斯堡尔谱（57）Fe研究了非超导NdFeAsO（T(N)=140K）和超导NdFeAsO(0.88)F(0.12)（T(c)=45K）的磁有序。在NdFeAsO中，低于T(N)140K时，在（57）Fe核处观察到一个磁超精细场B(hf)。在2K以下，B(hf)相对于饱和值的增加归因于Nd磁矩的共线反铁磁（AF）自旋结构导致Fe位点处转移的B(hf)。光谱分析与Fe自旋的相称AF序一致。在超导NdFeAsO(0.88)F(0.12)中，直至1.5K都未观察到B(hf)。
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