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Author (up) Allenspach, P.; Lee, B.W.; Gajewski, D.A.; Barbeta, V.B.; Maple, M.B.; Nieva, G.; Yoo, S.I.; Kramer, M.J.; McCallum, R.W.; Ben-Dor, L.
Title Comparison between the magnetic specific heat of NdBa2Cu3Ox and DyBa2Cu3Ox Type Journal Article
Year 1995 Publication Zeitschrift für Physik B Condensed Matter Abbreviated Journal Z. Physik B
Volume 96 Issue 4 Pages 455-464
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Publisher Springer Berlin / Heidelberg Place of Publication Editor
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ISSN 0722-3277 ISBN Medium
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Notes Approved no
Call Number BT @ gnieva @ Serial 459
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Author (up) Bud’ko, S.L.; Guimpel, J.; Nakamura, O.; Maple, M.B.; Schuller, I.K.
Title Uniaxial pressure dependence of the superconducting critical temperature in RBa{2}Cu{3}O{7-δ} high-T{c} oxides Type Journal Article
Year 1992 Publication Physical Review B Abbreviated Journal Prb
Volume 46 Issue 2 Pages 1257
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ jguimpel @ 10.1103/PhysRevB.46.1257 Serial 618
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Author (up) Iwasaki, H.; Dalichaouch, Y.; Markert, J.T.; Nieva, G.; Seaman, C.L.; Maple, M.B.
Title On narrowing of the resistive superconducting transition in applied magnetic fields and positive curvature in Hc2(T) in the (Gd1−xPrx)Ba2Cu3O7−δ system Type Journal Article
Year 1990 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 169 Issue 1-2 Pages 146-151
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Abstract 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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Call Number BT @ gnieva @ Serial 436
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Author (up) Luengo, C.A.; Cotignola, J.M.; Sereni, J.G.; Sweedler, A.R.; Maple, M.B.
Title Heat capacity of ThU alloys at low temperatures Type Conference Article
Year 1974 Publication Proceedings of the 13th International Conference on Low Temperature Physics (LT-13) Abbreviated Journal
Volume 2 Issue Pages 585
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Publisher Plenum Publishing Corp. Place of Publication New York Editor Timmerhaus, K.D. ; O'Sullivan, W.J. ; Hammel, E.F.
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Call Number BT @ pedrazp @ Serial 552
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Author (up) Luengo, C.A.; Huber, J.G.; Sereni, J.G.; Sweedler, A.R.; Cotignola, J.M.; Maple, M.B.
Title Low temperature specific heat of ThU Type Journal Article
Year 1972 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 10 Issue 5 Pages 459
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Abstract The low temperature specific heat of the weakly magnetic system Image U has been measured in both the normal and superconducting states. U impurities are found to enhanve the normal state electronic specific heat coefficient γ at an unusually large rate of 4.85 ± 0.50 mJ/mole °K2 at. % U. The specific heat jump at the superconducting transition for an alloy of composition 0.075 at. % U follows the BCS law of corresponding states suggesting that the system Image U is essentially non-magnetic at superconducting temperatures.
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ISSN 0038-1098 ISBN Medium
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Notes ISI:A1972L797500015 Approved no
Call Number BT @ hernan @ Serial 142
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Author (up) Maple, M.B.; Lee, B.W.; Neumeier, J.J.; Nieva, G.; Paulius, L.M.; Seaman, C.L.
Title Hybridization, hole localization and pair breaking in the high Tc superconducting system Y1-xPrxBa2Cu3O7-δ Type Journal Article
Year 1992 Publication Journal of Alloys and Compounds Abbreviated Journal
Volume 181 Issue 1-2 Pages 135-152
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Abstract 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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Call Number BT @ gnieva @ Serial 440
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Author (up) 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.
Title Experiments on Electron-and Hole-Doped High Tc Copper Oxide Superconductors Type Journal Article
Year 1990 Publication Transport Properties of Superconductors Abbreviated Journal
Volume Issue Pages 536
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Publisher World Scientific Place of Publication Singapore Editor Nicolsky, R.
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Call Number BT @ gnieva @ Serial 435
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Author (up) Nieva, G.; Osquiguil, E.; Guimpel, J.; Maenhoudt, M.; Wuyts, B.; Bruynseraede, Y.; Maple, M.B.; Schuller, I.K.
Title Photoinduced enhancement of superconductivity Type Journal Article
Year 1992 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 60 Issue 17 Pages 2159-2161
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Abstract We show clear and conclusive experimental evidence for the enhancement of superconductivity in GdBa2Cu3Ox and YBa 2Cu3Ox thin films by photoexcitation. Upon laser illumination the critical temperature increases while the resistivity of the material decreases. The relaxation back to the original state is very slow, of the order of days at room temperature. The existence of this effect opens the possibility of fabricating weak-link devices with in situ tunable superconducting characteristics.
Address Laboratorium voor Vaste Stof-Fysika en Magnetisme, Katholieke Universiteit Leuven, B3001 Leuven, Belgium
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ISSN 00036951 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 61; Export Date: 17 April 2009; Source: Scopus; doi: 10.1063/1.107069; Language of Original Document: English; Correspondence Address: Nieva, G.; Physics Department-0319; University of California-San Diego San Diego, CA 92093-0319, United States Approved no
Call Number BT @ osquigui @ Serial 404
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Author (up) Nieva, G.; Osquiguil, E.; Guimpel, J.; Maenhoudt, M.; Wuyts, B.; Bruynseraede, Y.; Maple, M.B.; Schuller, I.K.
Title Photoinduced changes in the transport properties of oxygen-deficient YBa2Cu3Ox Type Journal Article
Year 1992 Publication Physical Review B Abbreviated Journal
Volume 46 Issue 21 Pages 14249-14252
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Abstract We show that illumination of oxygen-deficient metallic YBa2Cu3Ox films produces a change in the Hall coefficient, an increase in the critical temperature, and a decrease in the electrical resistivity. These changes relax to equilibrium with characteristic times of the order of days, and are due to variations in both the carrier density and mobility. The relaxation times are of the same order of magnitude as the ones measured in nonilluminated oxygen-deficient films immediately after quenching.
Address Laboratory for Solid State Physics and Magnetism, University of Leuven, B3001 Leuven, Belgium
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 62; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.46.14249; Language of Original Document: English; Correspondence Address: Nieva, G.; Physics Department; University of California(enSan Diego San Diego, CA 92093-0319, United States Approved no
Call Number BT @ osquigui @ Serial 407
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Author (up) Sereni, J.G.; Huber, J.G.; Luengo, C.A.; Maple, M.B.
Title Calorimetric study of the magnetization of Ce impurities in superconducting Th-Y and Th-Sc alloys Type Journal Article
Year 1978 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.
Volume 30 Issue 5-6 Pages 729-737
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Abstract Specific heat measurements are reported in detail for the Ce impurity in the superconducting matrix systems Th65Sc35Ce, Th80Y20Ce, and Th65Y35Ce. The variation of the specific heat jump DeltaC at the superconducting transition temperature T c is indicative of the magnetic nature of an impurity. For Th65Y35Ce a departure is found from the BCS law of corresponding states predicted for a nonmagnetic impurity. This departure is correlated with that observed for (La, Th)Ce systems and related to DeltaT c/n (initial slope of T c vs. n) and Ce effective size (implied by lattice parameter data).
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ISSN 0022-2291 ISBN Medium
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Notes ISI:A1978EW47300012 Approved no
Call Number BT @ hernan @ Serial 140
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