Effect of chemical pressure on spin density wave and superconductivity in undoped and 15% F-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>Y</mml:mtext><mml:mi>y</mml:mi></mml:msub><mml:mtext>FeAsO</mml:mtext></mml:mrow></mml:math>compounds

Tropeano, M.; Fanciulli, Carlo; Canepa, F.; Cimberle, M. R.; Lamura, G.; Martinelli, A.; Putti, M.; Vignolo, M.; Palenzona, A.

doi:10.1103/physrevb.79.174523

Cited by 33 publications

(35 citation statements)

References 26 publications

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“…The observed decrease in T C with P substitution in optimally doped PrOFe 0.9 Co 0.1 As [22], is in contrast with the dT C /dx>0 obtained due to chemical pressure by partial Y substitution at the La or Ce site in ReFeAsO 1-x F x compound [26,27] or the observation of dT C /dP > 0 for an electron doped LaFeAsO 1-x F x [28].…”

Section: Resultscontrasting

confidence: 76%

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Sharma

Prakash

Thakur

et al. 2011

Supercond. Sci. Technol.

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PrOFe 0.9 Co 0.1 As is known to be a superconductor with a T C of ~14 K. In an attempt to induce charge transfer and also induce chemical pressure between the FeAs and PrO layers we have synthesized for the first time oxypnictides of the type PrOFe 0.9 Co 0.1 As 1-x P x (P doping at As sites). All the compounds crystallize in the tetragonal ZrCuSiAs type structure (space group = P4/nmm). The lattice parameters (a and c) decrease as expected on substitution of smaller phosphorous at the arsenic site in PrOFe 0.9 Co 0.1 As and a decrease in T C was observed on substitution of P ions at a low rate of 0.13K/at. % of P for x > 0.1. The irreversibility field (H irr ) and critical current density (J C ), obtained using the AC susceptibility measurements was found to decrease monotonically with increasing 'P' concentration. 'H irr ' is observed to be much smaller than H C2 , pointing to a very low pinning energy. The pinning potential obtained using both in-field transport and AC susceptibility measurements indicate a low value of ~40 meV and show no significant variation with P substitution.

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Section: Resultscontrasting

confidence: 76%

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Sharma

Prakash

Thakur

et al. 2011

Supercond. Sci. Technol.

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“…7,19,20,21,22 The samples underwent two heating treatments at high temperature, the former to synthesize the desired phase, the latter, Data were collected between 90 K and 290 K (λ = 0.50663 Å; step = 0.004° 2θ). Unfortunately, the experimental setup for SRPD data acquisition prevents to register the temperature at which each analytical file is acquired; hence the temperature was estimated on a chronological basis, thus suffering of a few uncertainties that can be estimated as 10 K at maximum.…”

Section: Methodsmentioning

confidence: 99%

Microstructural evolution throughout the structural transition in 1111 oxypnictides

2012

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The microstructural evolution throughout the first order tetragonal to orthorhombic structural transition is analyzed by powder diffraction analysis for two different systems belonging to the class of compounds referred to as 1111 oxy-pnictides: (La 1-y Y y )FeAsO and SmFeAs(O 1-x F x ). Both systems are characterized by a similar behaviour: on cooling microstrain along the tetragonal hh0 direction takes place and increases as the temperature is decreased. Just above the structural transition microstrain reaches its maximum value and then is abruptly suppressed by symmetry breaking. No volume discontinuity throughout the first order transition is observed and a groupsubgroup relationship holds between the tetragonal and the orthorhombic structures, thus suggesting that orbital ordering drives symmetry breaking. Microstrain reflects a distribution of lattice parameters in the tetragonal phase and explains the occurrence of anisotropic properties commonly attributed to nematic correlations; in this scenario the nematic behaviour is induced by the tendency towards ordering of Fe orbitals.

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“…15 ) samples showed that in the Fe-rich region superconducting and normal-state properties are strongly affected by disorder induced by Ru substitution; in the Ru-rich one the system is metallic and strongly compensated and the presence of Ru frustrates the magnetic moment on Fe ions. 23 A subsequent investigation revealed a re-entrant static magnetic order which degrades the superconducting ground state; it was then concluded that in this system the two order parameters compete, producing a nanoscopic phase separation. 24 …”

Section: Introductionmentioning

confidence: 96%

“…22 Theoretical calculations revealed that in the RE(Fe 1−x Ru x )AsO systems Ru atoms do not sustain any magnetic moment and Ru substitution progressively frustrates Fe moments. 23 Experimental investigations on optimally electron-doped Sm(Fe 1−x Ru x )As(O 0.85 F 0. 15 ) samples showed that in the Fe-rich region superconducting and normal-state properties are strongly affected by disorder induced by Ru substitution; in the Ru-rich one the system is metallic and strongly compensated and the presence of Ru frustrates the magnetic moment on Fe ions.…”

Section: Introductionmentioning

confidence: 99%

Structural properties and phase diagram of the La(Fe_1−xRu_x)AsO system

Martinelli

Palenzona

Pallecchi

et al. 2013

J. Phys.: Condens. Matter

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Structural refinement, lattice micro-strain and spontaneous strain analyses have been carried out on selected members of the La(Fe 1−x Ru x )AsO system using high resolution neutron and synchrotron powder diffraction data. The obtained results indicate that the character of the tetragonal to orthorhombic structural transition changes from first order for x = 0.10, possibly to tricritical for x = 0.20, up to second order for x = 0.30; for x 0.40 symmetry breaking is suppressed, even though a notable increase of the lattice micro-strain develops at low temperature. By combining structural findings with previous muon spin rotation data , a phase diagram of the La(Fe 1−x Ru x )AsO system has been drawn. Long-range ordered magnetism occurs within the orthorhombic phase (x ≤ 0.30), whereas short-range magnetism appears to be confined within the lattice strained region of the tetragonal phase up to x < 0.60. The direct comparison between the magnetic and the structural properties indicates that the magnetic transition is always associated to the structural symmetry breaking, although confined to a local scale at high Ru contents.

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Effect of chemical pressure on spin density wave and superconductivity in undoped and 15% F-dopedLa1−yYyFeAsOcompounds

Cited by 33 publications

References 26 publications

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Microstructural evolution throughout the structural transition in 1111 oxypnictides

Structural properties and phase diagram of the La(Fe_1−xRu_x)AsO system

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Effect of chemical pressure on spin density wave and superconductivity in undoped and 15% F-dopedLa1−yYyFeAsOcompounds

Cited by 33 publications

References 26 publications

Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping

Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping

Microstructural evolution throughout the structural transition in 1111 oxypnictides

Structural properties and phase diagram of the La(Fe1−xRux)AsO system

Contact Info

Product

Resources

About

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Superconducting and critical properties of PrOFe_0.9Co_0.1As: effect of P doping

Structural properties and phase diagram of the La(Fe_1−xRu_x)AsO system