Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4

Iida, Kazuki; Ishikado, Motoyuki; Nagai, Yuki; Yoshida, Hiroyuki; Christianson, Andrew D.; Murai, Naoki; Kawashima, Kenji; Yoshida, Yoshiyuki; Eisaki, Hiroshi; Iyo, Akira

doi:10.7566/JPSJ.86.093703

Title: Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe₄As₄

Journal Article · 03 August 2017 · Journal of the Physical Society of Japan

DOI: https://doi.org/10.7566/JPSJ.86.093703 · OSTI ID:1486969

Iida, Kazuki ^[1]; Ishikado, Motoyuki ^[1]; Nagai, Yuki ^[2]; Yoshida, Hiroyuki ^[3];

^[4]; Murai, Naoki ^[5]; Kawashima, Kenji ^[6]; Yoshida, Yoshiyuki ^[7]; Eisaki, Hiroshi ^[7]; Iyo, Akira ^[7]

Comprehensive Research Organization for Science and Society (CROSS), Ibaraki (Japan)
Japan Atomic Energy Agency, Chiba (Japan); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Hokkaido Univ., Sapporo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
IMRA Material R&D Co., Ltd., Aichi (Japan); National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)
National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)

Here, 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) Å^–1, corresponding to the (π,π) nesting wave vector in tetragonal notation, evolves below T_c. The characteristic energy of the spin resonance E_res = 12.5 meV is smaller than twice the size of the superconducting gap (2Δ). 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1486969

Journal Information:: Journal of the Physical Society of Japan, Vol. 86, Issue 9; ISSN 0031-9015

Publisher:: Physical Society of JapanCopyright Statement

Country of Publication:: United States

Language:: English

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