Magnetic Properties of RFe2Si2 and R(Fe1-xMx)2Si2 Systems (R=La, Y and Lu, M= Ni, Mn and Cu)

Abstract

Due to the similarity to BaFe2As2 and SrFe2As2 the RFe2Si2 (R=La, Y and Lu) system has been proposed as a potential candidate for a new superconducting family containing Fe-Si layers as a structural unit. Various R(Fe1-xMx)2Si2 M=Ni, Mn and Cu) materials were synthesized and measured for their magnetic properties. None of these materials is superconducting down to 5 K. Fe in RFe2Si2 is paramagnetic. A pronounced peak at 232 K was observed in the magnetization curve of YFe2Si2. 57Fe Mössbauer studies confirm the absence of any magnetic ordering at low temperatures. Similar peaks at various temperatures also appear in R(Fe1-xMx)2Si2 samples. Four independent factors affect the peak position and shift it to lower temperatures: (i) the lattice parameters, (ii) the concentration of x, (iii) the applied magnetic field, and (iv) the magnetic nature of M. The peak position is dramatically affected by the magnetic Mn dopants. It is propose that the magnetic peaks observed in RFe2Si2 and in R(Fe1-xMx)2Si2 represent a new nearly ferromagnetic Fermi liquid (NFFL) system and their nature is yet to be determined.

17 pages, 18 figures

References in corpus (10)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
• Structural, Thermal, Magnetic and Electronic Transport Properties of the LaNi2(Ge{1-x}P{x})2 System
• Crystal Growth and Physical Properties of SrCu2As2, SrCu2Sb2 and BaCu2Sb2
• Evidence of quantum criticality in the phase diagram of K${}_x$Sr${}_{1-x}$Fe${}_2$As${}_2$ from measurements of transport and thermoelectricity

Cited by in corpus (2)

• Evidence for proximity of YFe${}_2$Si${}_2$ to a magnetic quantum critical point
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$