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Iwasaki, H.; Dalichaouch, Y.; Markert, J.T.; Nieva, G.; Seaman, C.L.; Maple, M.B. |
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On narrowing of the resistive superconducting transition in applied magnetic fields and positive curvature in Hc2(T) in the (Gd1−xPrx)Ba2Cu3O7−δ system |
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1990 |
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Physica C: Superconductivity |
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Physica C |
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169 |
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1-2 |
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146-151 |
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The superconducting transition temperature Tc and the temperature dependence of the upper critical field Hc2 were measured resistively on polycrystalline samples in the (Gd1−xPrx)Ba2Cu3O7−δ system. The experimental results reveal that Tc decreases monotonically with increasing x and vanishes at x≈0.49. Whereas Hc2 of a sample with x=0.10 has an almost linear temperature dependence and the superconducting transition broadens with increasing magnetic field, a sample with x=0.45 shows strong positive curvature in the Hc2 versus temperature curve and narrowing of the superconducting transition width with increasing magnetic field. Both phenomena observed in the sample with x=0.45 can be explained qualitatively in terms of a negative exchange interaction between the superconducting charge carriers and the Pr 4f electrons. |
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BT @ gnieva @ |
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436 |
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Maple, M.B.; Lee, B.W.; Neumeier, J.J.; Nieva, G.; Paulius, L.M.; Seaman, C.L. |
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Hybridization, hole localization and pair breaking in the high Tc superconducting system Y1-xPrxBa2Cu3O7-δ |
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Journal Article |
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1992 |
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Journal of Alloys and Compounds |
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181 |
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1-2 |
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135-152 |
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The Y1-xPrxBa2Cu3O7-δ (δ ≈ 0.05) system has a rich temperature—praseodymium concentration (T-x) phase diagram consisting of a metal—insulator transition at xcr≈0.6, high Tc superconductivity in the metallic phase (0x≤xcr), and antiferromagnetic ordering of the Cu2+ and praseodymium ions at Néel temperatures TN(Cu) >TN(Cu)>TN(Pr) in the insulating phase (xcr≤x1). In the metallic phase, Tc decreases monotonically with x and vanishes near xcr, the dependence of Tc on pressure P and the upper critical field on temperature are both anomalous, and the low temperature specific heat can be resolved into a large γΓ contribution, reminiscent of heavy fermion behavior, and a spin Kondo anomaly; in the insulating phase, the values of TN(Pr) are anomalously large. These phenomena are briefly reviewed within the framework of a picture that is based on appreciable hybridization of the praseodymium localized 4f states and the CuO2 valence band states. A phenomenological model that incorporates the annihilation of mobile holes in the CuO2 planes and superconducting electron pair breaking by the praseodymium ions can describe Tc (x,P) for x ≤ 0.2. |
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Maple, M.B.; Ayoub, N.Y.; Beille, J.; Bjornholm, T.; Dalichaouch, Y.; Early, E.A.; Ghamaty, S.; Lee, B.W.; Markert, J.T.; Neumeier, J.J.; Nieva, G.; Paulius, L.M.; Schuller, I.K.; Seaman, C.L.; Tsai, P.K. |
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Experiments on Electron-and Hole-Doped High Tc Copper Oxide Superconductors |
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1990 |
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Transport Properties of Superconductors |
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536 |
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World Scientific |
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Singapore |
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Nicolsky, R. |
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435 |
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