Structural trends from a consistent set of single-crystal data of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mtext>FeAsO</mml:mtext></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mtext>La</mml:mtext></mml:mrow></mml:math>, Ce, Pr, Nd, Sm, Gd, and Tb)

Nitsche, Fabian; Jesche, Anton; Hieckmann, Е.; Doert, Th.; Ruck, Michael

doi:10.1103/physrevb.82.134514

Cited by 39 publications

(48 citation statements)

References 29 publications

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“…Diffraction patterns were analyzed by means of the Rietveld method, confirming that all the samples crystallized in the tetragonal phase (space group P4/nmm), and the values of (3) 129.06 (1) the lattice parameters a and c were extracted in turn (see figure 1 and table 1 -data for LaCoAsO are taken from [30]). In agreement with previous reports on 1111 compounds [20,30,32,33], the full substitution of R progressively shrinks the cell and, accordingly, reduces both a and c parameters with decreasing the ionic radius of R (see table 1). …”

Section: Methodssupporting

confidence: 80%

Effect of external pressure on the magnetic properties of R CoAsO ( R =La, Pr, Sm): a μSR study

Prando

Sanna

Khasanov

et al. 2015

Journal of Physics and Chemistry of Solids

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We report on a detailed investigation of the itinerant ferromagnets LaCoAsO, PrCoAsO and SmCoAsO performed by means of muon spin spectroscopy upon the application of external hydrostatic pressures p up to 2.4 GPa. These materials are shown to be magnetically hard in view of the weak dependence of both critical temperatures T C and internal fields at the muon site on p. In the cases R = La and Sm, the behaviour of the internal field is substantially unaltered up to p = 2.4 GPa. A much richer phenomenology is detected in PrCoAsO instead, possibly associated with a strong p dependence of the statistical population of the two different crystallographic sites for the muon. Surprisingly, results are notably different from what is observed in the case of the isostructural compounds RCoPO, where the full As/P substitution is already inducing a strong chemical pressure within the lattice but p is still very effective in further affecting the magnetic properties.

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Section: Methodssupporting

confidence: 80%

Effect of external pressure on the magnetic properties of R CoAsO ( R =La, Pr, Sm): a μSR study

Prando

Sanna

Khasanov

et al. 2015

Journal of Physics and Chemistry of Solids

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“…Powder x-ray diffraction at room temperature shows that PuFeAsO has the same tetragonal layered structure exhibited by LaFeAsO, with a unit cell volume close to GdFeAsO. A comparison of the relevant crystallographic parameters suggests that the stability of PuFeAsO can be well described by the hard-sphere model proposed for understanding the structural trends in the R-1111 system, 9 implying a Pu 3+ valence state with a well localized 5f electronic configuration. This is not the case for NpFeAsO, where the chemical bonds seem to have a more covalent or transition-metal-like character.…”

Section: Discussionmentioning

confidence: 85%

“…9 Nitsche et al have successfully employed a hard-sphere model in order to understand the structural trends in the RFeAsO system. The model reveals a geometrical limit for the structure and clearly explains why the RFeAsO compounds with the heavier (and smaller) R lanthanides can be obtained only via high-pressure synthesis methods.…”

Section: Resultsmentioning

confidence: 99%

Bulk properties and electronic structure of PuFeAsO

et al. 2012

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Here we present bulk property measurements and electronic structure calculations for PuFeAsO, an actinide analog of the iron-based rare-earth superconductors RFeAsO. Magnetic susceptibility and heat capacity data suggest the occurrence of an antiferromagnetic transition at T N = 50 K. No further anomalies have been observed down to 2 K, the minimum temperature that we have been able to achieve. Structural measurements indicate that PuFeAsO, with its more localized 5f electrons, bears a stronger resemblance to the RFeAsO compounds with larger R ions than NpFeAsO does.

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“…However, as many groups have proved through trial and error [1][2][3][4][5][6][7][8][9][10][11][12][13], the crystal growth of LnFePnO (Ln1111, Ln: lanthanide, Pn: pnictogen) oxypnictides is a difficult task. A number of exciting features with respect to structural, electronic, magnetic, and superconducting properties are still unresolved or have not been adequately studied yet.…”

Section: Introductionmentioning

confidence: 99%

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single cryst

et al. 2012

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Single-crystals of the LnFeAsO (Ln1111, Ln = Pr, Nd, and Sm) family with lateral dimensions up to 1 mm were grown from NaAs and KAs flux at high pressure. The crystals are of good structural quality and become superconducting when O is partially substituted by F (PrFeAsO 1-x F x and NdFeAsO 1-x F x ) or when Fe is substituted by Co (SmFe 1-x Co x AsO).From magnetization measurements, we estimate the temperature dependence and anisotropy of the upper critical field and the critical current density of underdoped PrFeAsO 0.7 F 0.3 crystal with T c ≈ 25 K. Single crystals of SmFe 1-x Co x AsO with maximal T c up to 16.3 K for x ≈ 0.08 were grown for the first time. From transport and magnetic measurements we estimate the critical fields and their anisotropy, and find these superconducting properties to be quite comparable to the ones in SmFeAsO 1-x F x with a much higher T c of ≈ 50 K. The magnetically measured critical current densities are as high as 10 9 A/m 2 at 2 K up to 7 T, with indication of the usual "fishtail" effect. The upper critical field estimated from resistivity measurements is anisotropic with slopes of ∼ -8.7 T/K (H || ab-plane) and ∼ -1.7 T/K (H || c-axis). This anisotropy (∼ 5) is similar to that in other Ln1111 crystals with various higher T c 's.

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Structural trends from a consistent set of single-crystal data ofRFeAsO(R=La, Ce, Pr, Nd, Sm, Gd, and Tb)

Cited by 39 publications

References 29 publications

Effect of external pressure on the magnetic properties of R CoAsO ( R =La, Pr, Sm): a μSR study

Effect of external pressure on the magnetic properties of R CoAsO ( R =La, Pr, Sm): a μSR study

Bulk properties and electronic structure of PuFeAsO

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single cryst

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