Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 86, Issue 9, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.86.093703
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Funding
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- JSPS KAKENHI [JP15K00178, JP15K17686, JP15K17712, JP17K14349]
- Topological Materials Science KAKENHI on Innovative Areas from JSPS of Japan [JP16H00995]
- Cooperative Research Program of Network Joint Research Center for Materials and Devices [2015143, 20161060]
- Grants-in-Aid for Scientific Research [16H00995, 17K14349] Funding Source: KAKEN
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The dynamical spin susceptibility in the new-structure-type iron-based superconductor CaKFe4As4 was investigated by using a combination of inelastic neutron scattering (INS) measurements and random phase approximation (RPA) calculations. Powder INS measurements show that the spin resonance at Q(res) = 1.17(1) angstrom(-1), corresponding to the (pi,pi) nesting wave vector in tetragonal notation, evolves below T-c. The characteristic energy of the spin resonance E-res = 12.5meV is smaller than twice the size of the superconducting gap (2 Delta). The broad energy feature of the dynamical susceptibility of the spin resonance can be explained by the RPA calculations, in which the different superconducting gaps on different Fermi surfaces are taken into account. Our INS and PRA studies demonstrate that the superconducting pairing nature in CaKFe4As4 is the s(+/-) symmetry.
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