Short-range cluster spin glass near optimal superconductivity in BaFe${}_{2-x}$Ni${}_x$As${}_2$

Abstract

High-temperature superconductivity in iron pnictides occurs when electrons are doped into their antiferromagnetic (AF) parent compounds. In addition to inducing superconductivity, electron-doping also changes the static commensurate AF order in the undoped parent compounds into short-range incommensurate AF order near optimal superconductivity. Here we use neutron scattering to demonstrate that the incommensurate AF order in BaFe${}_{2-x}$Ni${}_x$As${}_2$ is not a spin-density-wave arising from the itinerant electrons in nested Fermi surfaces, but consistent with a cluster spin glass in the matrix of the superconducting phase. Therefore, optimal superconductivity in iron pnictides coexists and competes with a mesoscopically separated cluster spin glass phase, much different from the homogeneous coexisting AF and superconducting phases in the underdoped regime.

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• NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors
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• The effect of Cr impurity to superconductivity in electron-doped BaFe2-xNixAs2
• Spin dynamics near a putative antiferromagnetic quantum critical point in Cu substituted BaFe${}_2$As${}_2$ and its relation to high-temperature superconductivity
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• Experimental elucidation of the origin of the `double spin resonances' in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2
• Magnetic field effects in electron systems with imperfect nesting
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
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• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Electronic specific heat in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Neutron spin resonance as a probe of superconducting gap anisotropy in partially detwinned electron underdoped NaFe${}_{0.985}$Co${}_{0.015}$As
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Neutron Scattering Study of Fluctuating and Static Spin Correlations in the Anisotropic Spin Glass Fe${}_2$TiO${}_5$
• Relationship between critical current and flux-flow resistivity in the mixed state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$