TY - JOUR
T1 - Evolution of superconductivity in PrFe1-xCoxAsO (x=0.0-1.0)
AU - Rani, Poonam
AU - Pal, Anand
AU - Awana, V. P.S.
N1 - Funding Information:
Authors acknowledge keen interest and encouragement from their Director Prof. R.C. Budhani. Poonam Rani is supported by the CSIR research intern scheme. Anand Pal is financially supported by UGC – Dr. D.S. Kothari Post Doctoral Fellowship . The work is supported by DAE-SRC outstanding researcher Award scheme to work on the search for new superconductors.
PY - 2014/6
Y1 - 2014/6
N2 - We report the synthesis and physical property characterization of PrFe 1-xCoxAsO (x=0.0-1.0). The studied samples are synthesized by through the solid state reaction route via the vacuum encapsulation method. The pristine compound PrFeAsO does not show superconductivity, but rather exhibits a metallic step like transition due to spin density wave (SDW) ordering of Fe moments (FeSDW) below 150 K, followed by another upward step due to anomalous ordering of Pr moments (PrTN) at 12 K. Both the FeSDW and PrTN temperatures decrease monotonically with Co substitution at Fe site. Superconductivity appears in a narrow range of x from 0.07 to 0.25 with maximum Tc at 11.12 K for x=0.15. Samples with x≥0.25 exhibit metallic behavior right from 300 K down to 2 K, without any FeSDW or PrTN steps in resistivity. In fact, though FeSDW decreases monotonically, the PrTN disappeared even with x=0.02. The magneto transport measurements below 14 T on superconducting polycrystalline Co doped PrFeAsO lead to extrapolated values of the upper critical fields [Hc2(0)] of up to 60 T.
AB - We report the synthesis and physical property characterization of PrFe 1-xCoxAsO (x=0.0-1.0). The studied samples are synthesized by through the solid state reaction route via the vacuum encapsulation method. The pristine compound PrFeAsO does not show superconductivity, but rather exhibits a metallic step like transition due to spin density wave (SDW) ordering of Fe moments (FeSDW) below 150 K, followed by another upward step due to anomalous ordering of Pr moments (PrTN) at 12 K. Both the FeSDW and PrTN temperatures decrease monotonically with Co substitution at Fe site. Superconductivity appears in a narrow range of x from 0.07 to 0.25 with maximum Tc at 11.12 K for x=0.15. Samples with x≥0.25 exhibit metallic behavior right from 300 K down to 2 K, without any FeSDW or PrTN steps in resistivity. In fact, though FeSDW decreases monotonically, the PrTN disappeared even with x=0.02. The magneto transport measurements below 14 T on superconducting polycrystalline Co doped PrFeAsO lead to extrapolated values of the upper critical fields [Hc2(0)] of up to 60 T.
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U2 - 10.1016/j.ssc.2014.02.006
DO - 10.1016/j.ssc.2014.02.006
M3 - Article
AN - SCOPUS:84894661111
SN - 0038-1098
VL - 187
SP - 5
EP - 9
JO - Solid State Communications
JF - Solid State Communications
ER -