Neutron Spin Resonance as a Probe of Superconducting Gap Anisotropy in Partially Detwinned Electron Underdoped NaFe0.985Cod0.015^As

Published

June 9, 2015

Author(s)

Chenglin Zhang, J. T. Park, Xingye Lu, Rong Yu, Yu Li, Wenliang Zhang, Yang Zhao, Jeffrey W. Lynn, Qimiao Si, Pengcheng Dai

Abstract

We use inelastic neutron scattering (INS) to study spin excitations in detwinned NaFe_0.985Cod0.015^As which has coexisting static antiferromagnetic (AF) order and superconductivity (T_c=15 K, T_N = 30 K). In previous INS work on twinned sample, spin excitations form dispersive sharp resonance near E_r1 = 3.25 meV and a broad dispersionless mode at E_r1 = 6 meV at NaFe_0.985Co_0.015As with the static AF order occurring at Q_AF = (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.

Citation

Physical Review B

Volume

91

Issue

10

Pub Type

Journals

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Keywords

Magnetic superconductor, iron-based superconductor, inelastic neutron scattering, detwinned single crystal, resonance anisotropy

Citation

Zhang, C. , Park, J. , Lu, X. , Yu, R. , Li, Y. , Zhang, W. , Zhao, Y. , Lynn, J. , Si, Q. and Dai, P. (2015), Neutron Spin Resonance as a Probe of Superconducting Gap Anisotropy in Partially Detwinned Electron Underdoped NaFe_0.985Cod0.015^As, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918430 (Accessed October 27, 2025)