Coexistence of antiferromagnetic ordering and superconductivity in the Ba(Fe0.961Rh0.039)

57Fe Mössbauer study of Lu2Fe3Si5 iron silicide superconductor

“…6 (a) and (b). The IS values of the 4d and 8h sites at 294 K are 0.225(2) mm/s and 0.227(1) mm/s, respectively, which are slightly larger than the typical values for iron-silicon compounds in which Fe carries no moment [25,26], but are about 0.2 mm/s smaller than that in the iron-pnictide compounds [10][11][12]. The temperature dependencies of the IS corresponding to the two sites are very similar, and no anomalies can be observed around T c (Fig.…”

“…Due to the absence of commonly available Mössbauer nuclides in the cuprates, most studies were accomplished either by partial substitution of copper atoms by 57 Fe and/or 119 Sn, or by using resonant isotopes of the rare earth metals, like 151 Eu, which increases the degree of difficulty of the measurements and reduces the clarity of the results [3,5,8,9]. Recently, the discovery of iron-based superconductors, that naturally contain the common Mössbauer nuclide, 57 Fe, has triggered intense Mössbauer studies of these superconductors [10][11][12][13][14][15]. Superconductivity in iron-pnictides is usually achieved by doping a magnetic parent compound with electrons or holes, or by application of chemical or physical pressure, and thereby, suppressing the magnetic order, suggesting that superconductivity and magnetism are closely related in this system.…”

Pressure effect on superconductivity in FeSe0.5Te0.5

“…Experimental results do not show any feature in the vicinity of T c and do not support any scenario of superconductivity based on anomalous softening of a phonon spectrum. The gradual decrease of δ with increasing temperature is caused by the second‐order Doppler shift only and can be described by a Debye model . Temperature dependence of |Δ E Q | is also typical for iron chalcogenides and can be plausibly fitted using the simplified model for tetragonal distortion in an axial electric field .…”

Incommensurate spin density wave versus local magnetic inhomogeneities in Ba(Fe1−xNix)2As2: a57Fe Mössbauer spectral study

“…were interpreted in the framework of an empirical model according to which the magnetic order is commensurate, and the dopant induces perturbations of the Fe moment amplitude [24,25]. In Ba(Fe 1−x Rh x ) 2 As 2 , Mössbauer spectra were interpreted assuming either an IC-SDW or the presence of disorder [26], while neutron scattering did not detect any incommensurability in this family [27].…”