Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y

Abstract

Polycrystalline samples and single crystals of SmFeAs1-xPxO1-y were synthesized and grown employing different synthesis methods and annealing conditions. Depending on the phosphorus and oxygen content, the samples are either magnetic or superconducting. In the fully oxygenated compounds the main impact of phosphorus substitution is to suppress the Néel temperature TN of the spin density wave (SDW) state, and to strongly reduce the local magnetic field in the SDW state, as deduced from muon spin rotation measurements. On the other hand the superconducting state is observed in the oxygen deficient samples only after heat treatment under high pressure. Oxygen deficiency as a result of synthesis at high pressure brings the Sm-O layer closer to the superconducting As/P-Fe-As/P block and provides additional electron transfer. Interestingly, the structural modifications in response to this variation of the electron count are significantly different when phosphorus is partly substituting arsenic. Point contact spectra are well described with two superconducting gaps. Magnetic and resistance measurements on single crystals indicate an in-plane magnetic penetration depth of 200 nm and an anisotropy of the upper critical field slope of 4-5. PACS number(s): 74.70.Xa, 74.62.Bf, 74.25.-q, 81.20.-n

36 pages, 13 figures, 2 tables

References in corpus (24)

• High-temperature superconductivity in iron-based materials
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• Iron pnictides as a new setting for quantum criticality
• High magnetic field scales and critical currents in SmFeAs(O,F) crystals: promising for applications
• Single crystal of superconducting SmFeAsO1-xFy grown at high pressure
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO${}_{1-x}$F${}_x$ measured by muon spin rotation
• Intrinsic Properties of Stoichiometric LaOFeP
• Muon-spin rotation studies of SmFeAsO_0.85 and NdFeAsO_0.85 superconductors
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• Evidence for two-gap superconductivity in (Ba,K)Fe_2As_2 by directional point contact Andreev reflection spectroscopy
• Specific heat of the iron-based high-$T_c$ superconductor SmO${}_{1-x}$F${}_x$FeAs
• Superconductivity induced by ruthenium substitution in an iron arsenide: investigation of SrFe2-xRuxAs2 (0 <= x <= 2)
• Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO_(1-x)F_x
• Th substituted SmFeAsO: structural details and superconductivity with Tc above 50 K
• Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy
• Evidence for two distinct anisotropies in the oxypnictide superconductors SmFeAsO_(0.8)F_(0.2) and NdFeAsO_(0.8)F_(0.2)
• Tuning of competing magnetic and superconducting phase volumes in LaFeAsO$_0.945F_0.055 by hydrostatic pressure
• Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO

Cited by in corpus (18)

• Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron-boson interaction
• High-pressure flux growth, structural, and superconducting properties of LnFeAsO (Ln = Pr, Nd, Sm) single crystals
• The phase diagrams of iron-based superconductors: theory and experiments
• Growth of whisker-like and bulk single crystals of PrFeAs(O,F) under high pressure
• High pressure crystal growth of the antiperovskite centrosymmetric superconductor SrPt3P
• Growth of bulk single-crystal MnP helimagnet and its structural and NMR characterization
• Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi${}_3$
• Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO
• Crystal growth, characterization and advanced study of the noncentrosymmetric superconductor Mo${}_3$Al${}_2$C
• High-pressure growth and characterization of bulk MnAs single crystals
• Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
• Emergence of superconductivity in single-crystalline LaFeAsO under simultaneous Sm and P substitution
• Change of the charge modulation during superconducting transition in SmFeAsO(0.91)F(0.09) seen by 57Fe Mössbauer spectroscopy
• Exploring 2D Materials by High Pressure Synthesis: hBN, Mg-hBN, b-P, b-AsP, and GeAs
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• Nodal-to-nodeless superconducting order parameter in LaFeAs${}_{1-x}$P${}_x$O synthesized under high pressure
• Crystal growth and characterization of the antiperovskite superconductor MgC1-xNi3-y
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals