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Influence of antiferromagnetic fluctuations on the pressure dependence of the critical temperature in FeSe | | S. Chadov
; F. Casper
; S. Naghavi
; C. Felser
; | | Date: |
28 Mar 2009 | | Abstract: | The interplay between electronic structure, band nesting and
antiferromagnetic fluctuations is of general interest for understanding the
unconventional superconductivity. For the present study, the tetragonal phase
of the superconducting FeSe was selected as model system. The electronic
structure of the low-temperature high-pressure phase of FeSe was investigated
by means of {it ab-initio} calculations to find the relation between the band
nesting and the critical temperature as a function of pressure. The crystal
structure for the highest $T_{
m C}$ was determined according to the criterion
of the {it optimum} pairing conditions within the unconventional
superconductivity regime which was suggested for this type of material by many
authors. Those {it optimum} conditions are found by studying the band
structure as function of lattice parameters that corresponds to the application
of pressure. As a striking result, two sorts of antiferromagnetic fluctuations
corresponding to the intra-layer as well as the inter-layer Fe-Fe coupling are
identified. The structure corresponding to a strongest contribution of both
mechanisms to the superconducting pairing is found to be in a very good
agreement with the experimental crystal structure corresponding to a maximum of
$T_{
m C}$ and qualitatively explains the pressure dependence observed in
experiments. | | Source: | arXiv, 0903.4721 | | Services: | Forum | Review | PDF | Favorites | |
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