Neutron Spin Resonance as a Probe of Superconducting Gap Anisotropy in Partially Detwinned Electron Underdoped NaFe0.985Cod0.015^As
Chenglin Zhang, J. T. Park, Xingye Lu, Rong Yu, Yu Li, Wenliang Zhang, Yang Zhao, Jeffrey W. Lynn, Qimiao Si, Pengcheng Dai
We use inelastic neutron scattering (INS) to study spin excitations in detwinned NaFe0.985Cod0.015^As which has coexisting static antiferromagnetic (AF) order and superconductivity (Tc=15 K, TN = 30 K). In previous INS work on twinned sample, spin excitations form dispersive sharp resonance near Er1 = 3.25 meV and a broad dispersionless mode at Er1 = 6 meV at NaFe0.985Co0.015As with the static AF order occurring at QAF = (1,0) but not ast (0,1), we still find double resonance at both wave vectors. Since spin rotational symmetry is explicitly broken at Q1 = (1,0), these results indicate that the double resonance cannot be due to the static and fluctuating AF orders, but originate from the superconducting gap anisotropy.
Magnetic superconductor, iron-based superconductor, inelastic neutron scattering, detwinned single crystal, resonance anisotropy
, Park, J.
, Lu, X.
, Yu, R.
, Li, Y.
, Zhang, W.
, Zhao, Y.
, Lynn, J.
, Si, Q.
and Dai, P.
Neutron Spin Resonance as a Probe of Superconducting Gap Anisotropy in Partially Detwinned Electron Underdoped NaFe<sub>0.985Co</sub>d0.015^As, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918430
(Accessed December 10, 2023)