Neutron scattering study of underdoped Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>K<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>As

Rotundu, C. R.; Rule, K. C.; Forrest, Thomas R.; Zhao, Jun; Zarestky, J.; Birgeneau, R. J.

doi:10.1103/physrevb.85.144506

Cited by 5 publications

(7 citation statements)

References 53 publications

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“…The reduction of the locally measured ordered magnetic moment size below T c = 11.2 K indicates a microscopic coexistence of and competition for magnetic and superconducting order parameter. Such a competition was already observed by µSR for FeSe [12,13] and by µSR, Moessbauer spectroscopy and neutron scattering for other iron based superconductors [40][41][42][43][44][45][46][47][48][49][50][51]. The decrease of the magnetic fraction below T c reveals an additional competition for volume of the respective phases, again in analogy to FeSe [12,13].…”

supporting

confidence: 60%

Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe1−xSx

et al. 2019

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We report muon spin rotation (µSR) and magnetization measurements under pressure on Fe 1+δ Se1-xSx with x ≈ 0.11. We find an extended dome of long range magnetic order above p ≈ 0.6 GPa spanning a pressure range between previously reported separated magnetic phases. The magnetism initially competes with coexisting superconductivity leading to a local maximum and minimum of the superconducting Tc(p). The maximum of Tc corresponds to the onset of magnetism while the minimum coincides with the pressure of strongest competition. A shift of the maximum of Tc(p) for a series of single crystals with x up to 0.14 roughly extrapolates to a putative magnetic and superconducting state at ambient pressure for x ≥ 0.2.

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supporting

confidence: 60%

Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe1−xSx

et al. 2019

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“…Literature data for | M co | 2 /| M 0 | 2 (T = 0) as a function of T c /T N for various 122 compounds, measured by neutron scattering and μSR [27,30,[52][53][54][55][56][57][58][59][60][61] as well as the reduction of the structural order parameter S = (a c − b c )/(a c + b c ) (with a c and b c being the crystallographic a and b axis parameters, respectively) are shown in Fig. 10.…”

Section: Landau Theory For Coupled Order Parameters: Coexistence Omentioning

confidence: 99%

“…The recoilless fraction f was extracted from the Mössbauer spectra using the absorption area method [68]. In the Debye-approximation [69] [27,30,[52][53][54][55][56][57][58][59][60][61]. | M co | 2 denotes the magnetic order parameter in the region of coexistence with superconductivity.…”

Section: Lattice Dynamics and Chemical Shift Changes At The Magnetmentioning

confidence: 99%

Coexistence of superconductivity and magnetism inCa1−xNaxFe2As2: Universal suppression of the magnetic order parameter in 122 iron pnictides

et al. 2015

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We present a detailed investigation of the magnetic and superconducting properties of Ca 1−x Na x Fe 2 As 2 single crystals with x = 0.00, 0.35, 0.50, and 0.67 by means of the local probe techniques Mössbauer spectroscopy and muon spin relaxation experiments. With increasing Na-substitution level, the magnetic order parameter is suppressed. For x = 0.50 we find a microscopic coexistence of magnetic and superconducting phases accompanied by a reduction of the magnetic order parameter below the superconducting transition temperature T c. A systematic comparison with other 122 pnictides reveals a square-root correlation between the reduction of the magnetic order parameter and the ratio of the transition temperatures T c /T N , which can be understood in the framework of a Landau theory. In the optimally doped sample with T c ≈ 34 K, diluted magnetism is found and the temperature dependence of the penetration depth and superfluid density are obtained, proving the presence of two superconducting s-wave gaps.

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“…9. 23,30,[37][38][39][40][41][42][43][44][45][46] In addition, the reduction of the structural order parameter S = (a − b)/(a + b) is plotted in Fig. 9.…”

Section: Landau Theory For Coupled Order Parametersmentioning

confidence: 99%

“…Therefore, the lattice dynamics are independent of the Na-substitution level in the investigated substitution range 0.35 ≤ x ≤ 0.67. In comparison with the 23,30,[37][38][39][40][41][42][43][44][45][46] | Mco| 2 denotes the magnetic order parameter in the region of coexistence with superconductivity. | M0| 2 denotes the magnetic order parameter without any superconductivity.…”

Section: Magneto-structural Phase Transitionmentioning

confidence: 99%

Microscopic coexistence of superconductivity and magnetism in Ca1-xNaxFe2As2

Materne¹,

Kamusella²,

Sarkar³

et al. 2015

Preprint

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We present a detailed investigation of the magnetic and superconducting properties of Ca1−xNaxFe2As2 single crystals with x = 0.00, 0.35, 0.50, and 0.67 by means of the local probe techniques Mössbauer spectroscopy and muon spin relaxation experiments. With increasing Nasubstitution level, the magnetic order parameter as well as the magneto-structural phase transition are suppressed. For x = 0.50 we find a microscopic coexistence of magnetic and superconducting phases accompanied by a reduction of the magnetic order parameter below the superconducting transition temperature Tc. A systematic comparison with other 122 pnictides reveals a square-root correlation between the reduction of the magnetic order parameter and the ratio of the transition temperatures, Tc/TN , which can be understood in the framework of a Landau theory. In the optimally doped sample with Tc ≈ 34 K, diluted magnetism is found and the temperature dependence of the penetration depth and superfluid density are obtained, proving the presence of two superconducting s-wave gaps.

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Neutron scattering study of underdoped Ba1−xKxFe2As

Cited by 5 publications

References 53 publications

Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe1−xSx

Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe1−xSx

Coexistence of superconductivity and magnetism inCa1−xNaxFe2As2: Universal suppression of the magnetic order parameter in 122 iron pnictides

Microscopic coexistence of superconductivity and magnetism in Ca1-xNaxFe2As2

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