Magnetic ordering and superconductivity in the Nd1−xPrxBa2Cu3O7−y system

Jhans, H. ; Malik, S. K. ; Dhar, S. K. ; Vijayaraghavan, R. (1993) Magnetic ordering and superconductivity in the Nd1−xPrxBa2Cu3O7−y system Physica C: Superconductivity, 207 (3-4). pp. 247-254. ISSN 0921-4534

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We have investigated magnetic ordering and superconducting properties of the Nd1−xPrxBa2Cu3O7−y series (x=0-1.0). The system is superconducting in the 0≤x≤0.25 range, beyond which the superconductivity is quenched. The value of xcr is estimated to be ≈0.27. For x≥0.3, electrical resistivity displays insulator-like behavior. Heat capacity measurements (2-25 K temperature range) on this series reveal that the peak in the Cp(T) data at about 16.5 K for x=1.0 (identified as the Néel temperature, TN, due to the Pr ion ordering) moves to lower temperatures, and is progressively suppressed as x decreases from x=1.0 to x=0.4 (insulating regime). The TN(x) curve is linear and lies above the corresponding plots for Y1−xPrxBa2Cu3O7−y and Eu1−xPrxBa2Cu3O7−y. We point out that TN(x) depends linearly on R3+ ionic radius, similar to that reported in the literature for Tc(x). For x=0.6, 0.4, a broad anomaly in Cp(T) develops around 3 K. For x=0.2 (superconducting sample), the peak in Cp(T), due to the Pr ion ordering, is not observed, as expected; however, below 5 K, Cp exhibits a large upturn which seems to develop into a maximum at about 2 K. This feature at about 2-3 K in Cp(T) may be due to a Schottky anomaly due to the Nd ions.

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ID Code:61872
Deposited On:15 Sep 2011 11:54
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