Hyperfine interaction and electronic spin fluctuation study on Sr$_{2-x}$La$_x$FeCoO$_6$ (x = 0, 1, 2) by high-resolution back-scattering neutron spectroscopy
The study of hyperfine interaction by high-resolution inelastic neutron scattering is not very well known compared to the other competing techniques viz. NMR, M\"ossbauer, PACS etc. Also the study is limited mostly to magnetically ordered systems. Here we report such study on Sr2−xLaxFeCoO6 (x = 0, 1, 2) of which first (Sr2FeCoO6 with x = 0) has a canonical spin spin glass, the second (SrLaFeCoO6 with x = 1) has a so-called magnetic glass and the third (La2FeCoO6 with x = 2) has a magnetically ordered ground state. Our present study revealed clear inelastic signal for SrLaFeCoO6, possibly also inelastic signal for Sr2FeCoO6 below the spin freezing temperatures Tsf but no inelastic signal at all for for the magnetically ordered La2FeCoO6 in the neutron scattering spectra. The broadened inelastic signals observed suggest hyperfine field distribution in the two disordered magnetic glassy systems and no signal for the third compound suggests no or very small hyperfine field at the Co nucleus due to Co electronic moment. For the two magnetic glassy system apart from the hyperfine signal due only to Co, we also observed electronic spin fluctuations probably from both Fe and Co electronic moments. \end{abstract}
@article{arxiv.1803.04685,
title = {Hyperfine interaction and electronic spin fluctuation study on Sr$_{2-x}$La$_x$FeCoO$_6$ (x = 0, 1, 2) by high-resolution back-scattering neutron spectroscopy},
author = {T. Chatterji and B. Frick and M. Zamponi and M. Appel and H. S. Nair and R. Pradheesh and G. R. Hariprya and V. Sankaranarayanan and K. Sethupathi},
journal= {arXiv preprint arXiv:1803.04685},
year = {2018}
}