Structural studies and T
c dependence in La2?x
Dy
x
Ca
y
Ba2Cu4+y
O
z
type mixed oxide superconductors |
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| Authors: | S Rayaprol Krushna Mavani CM Thaker DS Rana Keka Chakravorty SK Paranjape M Ramanadham Nilesh A Kulkarni DG Kuberkar |
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| Institution: | (1) Department of Physics, Saurashtra University, Rajkot, India;(2) Solid State Physics Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(3) Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005 Mumbai, India |
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| Abstract: | A new series of mixed oxide superconductors with the stoichiometric composition La2−x
Dy
x
Ca
y
Ba2Cu4+y
O
z
(x=0.0 − 0.5, y=2x) has been studied for structural and superconductiong properties. Our earlier studies on La2−x
(Y/Er)
x
Ca
y
Ba2Cu4+y
O
z
series, show a strong dependence of T
c on hole concentration (p
sh). In the present work, the results of the analysis of the neutron diffraction measurements at room temprerature on x=0.3 and 0.5 samples are reported. It is interesting to know that Ca substitutes for both La and Ba site with concomitant
displacement of La onto Ba site. Superconductivity studies show that maximum T
c is obtained for x=0.5, y=1.0 sample (T
c ∼ 75 K), for La1.5Dy0.5Ca1Ba2Cu5O
z
(La-2125). |
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| Keywords: | Oxide superconductors La2− x Dy x Ca y Ba2Cu4+y O z structural studies T c dependence neutron diffraction |
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