Journal
PHYSICAL REVIEW B
Volume 84, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.024518
Keywords
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Funding
- Chinese Academy of Science [2010CB833102, 2010CB923002, 2011CBA00110]
- US DOE, BES [DOE DE-FG02-05ER46202]
- Division of Scientific User Facilities
- National Science Foundation [DMR-0944772]
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We use inelastic neutron scattering to study the effect of an in-plane magnetic field on the magnetic resonance in optimally doped superconductors FeSe0.4Te0.6 (T-c = 14 K) and BaFe1.9Ni0.1As2 (T-c = 20 K). While the magnetic field up to 14.5 T does not change the energy of the resonance, it partially suppresses T-c and the corresponding superconductivity-induced intensity gain of the mode. However, we find no direct evidence for the field-induced spin-1 Zeeman splitting of the resonance. Therefore it is still unclear if the resonance is the long-sought singlet-triplet excitation directly coupled to the superconducting electron Cooper pairs.
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