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29 March 2024
 
  » arxiv » cond-mat/0403230

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Systematic induction of superconductivity in Y1-xCaxBa2Cu3O6.3 system
V.P.S. Awana ; Anurag Gupta ; M.A. Ansari ; S.B. Samanta ; R.B. Saxena ; H. Kishan ; Devendra Buddhikot ; S.K. Malik ; V. Ganesan ; A.V. Narlikar ;
Date 9 Mar 2004
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AffiliationNPL, New Delhi, India), Devendra Buddhikot and S.K. Malik (TIFR, Mumbai, India), and V. Ganesan and A.V. Narlikar (IUC, Indore, INDIA
AbstractCompounds of series YBa2Cu3O7-d (d = 0.7), being synthesized by solid-state synthesis route with x = 0.0, 0.10, 0.15 and 0.20, crystallize in single-phase form with tetragonal structure (space group P4/mmm). The c-lattice parameter increases with increasing x, indicating successful substitution of Y3+ by bigger Ca2+ ion. Resistance versus temperature (R vs. T) measurements show that pristine sample (x = 0.0) is semiconducting down to 5 K. Induction of superconductivity is seen with an increase in x. The x = 0.10 sample exhibit the onset of superconducting transition (Tconset) at around 42 K without attaining zero resistance superconducting transition temperature (TcR=0) state down to 5 K. For x = 0.15 and 0.20 samples TcR=0 is observed at 25 K and 35 K with Tconset of 52 K and 61 K respectively. Thermo-electric power (S) measurements in temperature range of 5 - 300 K, exhibited TcS=0 at around 25 K and 35 K respectively for x = 0.15 and 0.20 samples. Further a sign change in S from +ve to -ve is observed at low temperatures for x = 0.0 sample. Room temperature +ve S value decreases with increase in x, indicating enhanced number of mobile holes. The Magneto-transport measurements under applied magnet ic fields of 3 and 6 Tesla show the broadening of superconducting transition for x = 0.15, and 0.20 samples. For x = 0.10 sample the superconducting transition is suppressed in applied fields of 3 and 6 Tesla. Our results will help in constructing the complete phase diagram of Y1-xCaxBa2Cu3O7-d compounds with various x and d.
Source arXiv, cond-mat/0403230
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