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2012 ; 13
(5
): 054302
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Magnetic excitations in iron chalcogenide superconductors
#MMPMID27877515
Kotegawa H
; Fujita M
Sci Technol Adv Mater
2012[Oct]; 13
(5
): 054302
PMID27877515
show ga
Nuclear magnetic resonance and neutron scattering experiments in iron
chalcogenide superconductors are reviewed to make a survey of the magnetic
excitations in FeSe, FeSe(1-x) Te (x) and alkali-metal-doped A(x) Fe(2-y) Se(2)
(A = K, Rb, Cs, etc). In FeSe, the intimate relationship between the spin
fluctuations and superconductivity can be seen universally for the variations in
the off-stoichiometry, the Co-substitution and applied pressure. The isovalent
compound FeTe has a magnetic ordering with different wave vector from that of
other Fe-based magnetic materials. The transition temperature T(c) of FeSe
increases with Te substitution in FeSe(1-x) Te (x) with small x, and decreases in
the vicinity of the end member FeTe. The spin fluctuations are drastically
modified by the Te substitution. In the vicinity of the end member FeTe, the
low-energy part of the spin fluctuation is dominated by the wave vector of the
ordered phase of FeTe; however, the reduction of T(c) shows that it does not
support superconductivity. The presence of same wave vector as that of other
Fe-based superconductors in FeSe(1-x) Te (x) and the observation of the resonance
mode demonstrate that FeSe(1-x) Te (x) belongs to the same group as most of other
Fe-based superconductors in the entire range of x, where superconductivity is
mediated by the spin fluctuations whose wave vector is the same as the nesting
vector between the hole pockets and the electron pockets. On the other hand, the
spin fluctuations differ for alkali-metal-doped A(x) Fe(2-y) Se(2) and FeSe or
other Fe-based superconductors in their wave vector and strength in the
low-energy part, most likely because of the different Fermi surfaces. The
resonance mode with different wave vector suggests that A(x) Fe(2-y) Se(2) has an
exceptional superconducting symmetry among Fe-based superconductors.
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