Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-11
EPL 92, 47005 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Accepted for publication in Europhys. Lett. 6 pages, 4 figures
Scientific paper
10.1209/0295-5075/92/47005
We present a phenomenological, two-fluid approach to understanding the magnetic excitations in Fe pnictides, in which a paramagnetic fluid with gapless, incoherent particle-hole excitations coexists with an antiferromagnetic fluid with gapped, coherent spin wave excitations. We show that this two-fluid phenomenology provides an excellent quantitative description of NMR data for magnetic "122" pnictides, and argue that it finds a natural justification in LSDA and spin density wave calculations. We further use this phenomenology to estimate the maximum renormalisation of the ordered moment that can follow from low-energy spin fluctuations in Fe pnictides. We find that this is too small to account for the discrepancy between ab intio calculations and neutron scattering measurements.
Shannon Nic
Smerald Andrew
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