TY - JOUR
T1 - Magnetic and structural relationship of RFe2Si2 and R(Fe1-xMx)2Si2(x = 0-1) systems (R = La, y and Lu, M = Ni, Mn and Cu)
AU - Felner, I.
AU - Lv, Bing
AU - Chu, C. W.
N1 - Publisher Copyright:
© 2014 IOP Publishing Ltd.
PY - 2014/11/26
Y1 - 2014/11/26
N2 - Due to the similarity between AFe2As2 (A = Ba, Sr) and RFe2Si2 (R = La, Y and Lu), the RFe2Si2 system has been proposed as a potential candidate for a new high TC superconducting family containing Fe-Si (instead of Fe-As) layers as a structural unit. Various R (Fe1-xMx)2 Si2 (M = Ni and Cu) materials were synthesized and measured for their magnetic properties. None of these materials is superconducting down to 1.8 K. A pronounced peak at 232 K was observed in the magnetization curve of YFe2Si2. 57Fe Mössbauer studies confirm the absence of any long-range magnetic ordering below 232 K. Similar peaks at various temperatures also appear in R (Fe1-xMx)2 Si2 samples. For Y (Fe1-xMnx)2 Si2 the peak position is dramatically affected by the magnetic Mn dopants. 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. It is proposed that the magnetic peaks observed in RFe2Si2 and in R (Fe1-xMx)2 Si2 represent a new nearly ferromagnetic Fermi liquid system, its nature is yet to be determined.
AB - Due to the similarity between AFe2As2 (A = Ba, Sr) and RFe2Si2 (R = La, Y and Lu), the RFe2Si2 system has been proposed as a potential candidate for a new high TC superconducting family containing Fe-Si (instead of Fe-As) layers as a structural unit. Various R (Fe1-xMx)2 Si2 (M = Ni and Cu) materials were synthesized and measured for their magnetic properties. None of these materials is superconducting down to 1.8 K. A pronounced peak at 232 K was observed in the magnetization curve of YFe2Si2. 57Fe Mössbauer studies confirm the absence of any long-range magnetic ordering below 232 K. Similar peaks at various temperatures also appear in R (Fe1-xMx)2 Si2 samples. For Y (Fe1-xMnx)2 Si2 the peak position is dramatically affected by the magnetic Mn dopants. 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. It is proposed that the magnetic peaks observed in RFe2Si2 and in R (Fe1-xMx)2 Si2 represent a new nearly ferromagnetic Fermi liquid system, its nature is yet to be determined.
KW - magnetic properties
KW - nearly ferromagnetic Fermi liquid
KW - rare-earth silicides
KW - superconductivity
UR - http://www.scopus.com/inward/record.url?scp=84908587193&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/26/47/476002
DO - 10.1088/0953-8984/26/47/476002
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AN - SCOPUS:84908587193
SN - 0953-8984
VL - 26
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 47
M1 - 476002
ER -