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Author (down) Trovarelli, O.; Stickar, P.; Sereni, J.G.; Schmerber, G.; Kappler, J.P.
Title Coexistence of magnetic and non magnetic states in Ce14X51 (X = Au, Ag and Cu) Type Journal Article
Year 1994 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 89 Issue 5 Pages 421-424
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Abstract Magnetic (chi), thermal(C-p), and transport (p) measurements on Ce(l4)X(51) (X = Au, Ag and Cu) are presented. All these compounds show antiferromagnetic type order at low temperatures, with T-N = 0.9 K (Au), 1.1 K (Ag) and 3.2 K (Cu). Within the Gd14Ag51-type structure the Ce atoms sit in different sublattices denoted by I (2 atoms), II (6 atoms) and III (6 atoms), therefore the results can be interpreted in terms of three different behaviors of Ce depending on its local environment. From the entropy involved in the magnetically ordered (MO) phase it can be established that the Ce-II and Ce-III atoms order in Cel4Au51 and Ce14Ag51, while the Ce-I order in Cel4Cu51. There is a large linear contribution to Cp at T > T-N,T-gamma HT = 0.81 (Au), 1.24 (Ag) and 3.1 (Cu) J/mol K-2, which indicates the coexistence of MO and heavy fermions. In the case of Cel4Cu51, the magnetic contribution to Cp from sublattice Ce-I around T-N,T- resembles that of a modulated system and the characteristic temperatures for Ce-II and Ce-III atoms are estimated from p(T) as:T-K=16 K and >120 K respectively.
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ISSN 0038-1098 ISBN Medium
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Notes ISI:A1994MX74400003 Approved no
Call Number BT @ hernan @ Serial 107
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Author (down) Shalóm, D. E.; Pastoriza, H.
Title Experimental evidence for anisotropic response of a driven vortex lattice Type Journal Article
Year 2003 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 126 Issue 7 Pages 379-383
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Abstract We present kinetic inductance measurements in current driven Josephson junction arrays. Measurements performed with circular coils indicate that this technique is very sensitive to the vortex mobility. Results obtained with anisotropic detection coils provide experimental evidence for the anisotropic response of a driven vortex lattice. Anisotropic behavior is obtained when rising the temperature or the mean vortex velocity as indicated by the loss of the superconducting shielding capability, first in the direction of vortex motion and then in the perpendicular direction.
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Call Number BT @ hernan @ shalom03 Serial 42
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Author (down) Seyfarth, G.; Jaccard, D.; Pedrazzini, P.; Krzton-Maziopa, A.; Pomjakushina, E.; Conder, K.; Shermadini, Z.
Title Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study Type Journal Article
Year 2011 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 151 Issue 10 Pages 747-750
Keywords Fe; Se; chalcogenides; Superconductivity; High pressure; electrical resistivity
Abstract We report measurements of the temperature and pressure dependence of the electrical resistivity (ρ) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature Tc~30K source develops from a normal state with extremely large resistivity. At ambient pressure, a large “hump” in the resistivity is observed around 200 K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around pc~30K. Even at 9 GPa a metallic resistivity state is not recovered, and the ρ(T) “hump” is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that the superconductivity is not related to this hump.
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Call Number BT @ pedrazp @ Serial 604
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Author (down) Sereni, J.G.; Huber, T.E.; Luengo, C.A.
Title Low temperature specific heat of Th-Gd spin glass Type Journal Article
Year 1979 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 29 Issue 9 Pages 671-673
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Abstract The specific heat measurements of Th---Gd alloys, with Gd concentration ranging from 0.15% to 10.8% and temperatures between 0.4 and 8 K, are reported. The characteristic spin glass specific heat enhancement and its maximum was found linearly proportional to Gd concentration. At low temperatures a T2 dependence of the specific heat was observed and the entropy associated with the magnetic ordering was the 70% of the expected value for the spin S = 7/2.
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Notes ISI:A1979GP96400009 Approved no
Call Number BT @ hernan @ Serial 139
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Author (down) Sereni, J.G.; Huber, J.G.; Luengo, C.A.; Maple, M.B.
Title Specific heat of superconducting Th, Sc and Th, Y alloys with Ce Type Journal Article
Year 1975 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 17 Issue 12 Pages 1581-1583
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Abstract Measurements of the specific heat jump ΔC at the superconducting critical temperature Tc on (Image )Ce and (Image )Ce Ce impurity, solid solution alloy systems indicate that the former systems obey the BCS law of corresponding states (LCS) characteristic of superconductors with non-magnetic impurities while the latter systems present deviations from the LCS linear relation between reduced parameters which are attributed to the development of localized moments at the Ce ions as the Y concentration increases.
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Notes ISI:A1975AZ36600027 Approved no
Call Number BT @ hernan @ Serial 141
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Author (down) Rodriguez, E.; Luzuriaga, J.; Núñez Regueiro, M.; Fainstein, C.
Title Low temperature internal friction peak in high Tc superconductors Type Journal Article
Year 1991 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 77 Issue 10 Pages 777-780
Keywords Ceramic Materials; Oxides – Acoustic Properties; Yttrium Compounds – Acoustic Properties; Acoustic Variables Measurement; Attenuation Peak; Calcium Compounds; Low Temperature Internal Friction Peak; Strontium Compounds; Thermally Activated Relaxation Behavior; High Temperature Superconductors
Abstract We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown.
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Notes ISI:A1991FA71400006 Approved no
Call Number BT @ hernan @ Serial 256
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Author (down) Osquiguil, E.; Frank, V.L.P.; de la Cruz, F.
Title Two dimensional collective flux pinning in melt spun superconducting amorphous Zr70Cu30 Type Journal Article
Year 1985 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 55 Issue 3 Pages 227-230
Keywords ZIRCONIUM COPPER ALLOYS – Amorphous; CRITICAL CURRENTS; PINNING FORCES; SUPERCONDUCTING MATERIALS
Abstract We have measured the critical currents in melt spun amorphous Zr70Cu30 and their evolution with heat treatment. We found that the pinning forces may be interpreted in terms of the Larkin-Ovchinnikov two dimensional collective pinning theory.
Address Centro Atómico Bariloche – Instituto Balseiro, Argentina
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Notes Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro At Approved no
Call Number BT @ osquigui @ Serial 420
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Author (down) Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F.
Title La1.80 Sr0.20 CuO4-delta a clean limit superconductor Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 65 Issue 6 Pages 491-494
Keywords CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS
Abstract The electrical resistivity of the superconductor La1.80Sr0.20Cu04-? has been measured in a wide range of temperatures as a function of oxygen and vacuum heat treatments. The resistivity changes reversibly orders of magnitude with oxygen concentration. There is no sign of saturation at high temperatures, even for samples where the resistivity is increased by heat treatment in vacuum. Using the experimental data and general arguments it is concluded that the ceramic superconductors are high ? materials in the clean limit.
Address Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. Approved no
Call Number BT @ osquigui @ Serial 416
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Author (down) Núñez Regueiro, M.; Izbizky, M.A.; Esquinazi, P.
Title Thermal conductivity and “disorder” in high temperature superconductors Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 67 Issue 4 Pages 401-404
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Abstract We analyze the controversial thermal conductivity results on high temperature superconductors by scaling the data with material parameters to compare them to other materials with similar behaviour. We show that they have the same general features observed in amorphous and disordered crystalline materials. Possible origins of the disorder are discussed.
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Call Number BT @ pedrazp @ Serial 583
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Author (down) Luzuriaga, J.; D'Ovidio, C.; de la Cruz, F.
Title Ideal two dimensional flux pinning induced by annealing in superconducting amorphous Zr75Rh25 Type Journal Article
Year 1986 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 57 Issue 9 Pages 753-756
Keywords ZIRCONIUM COMPOUNDS – Physical Properties; CRITICAL CURRENT; FLUX PINNING; MELT SPINNING; PINNING FORCES; SUPERCONDUCTING MATRIX; SUPERCONDUCTING MATERIALS
Abstract By annealing amorphous Zr75Rh25 prepared by melt spinning an ideal behaviour of the critical current was observed, in which the measured pinning forces are seen to follow the two dimensional Larkin-Orchivnikov theory. In the region where this theory is valid the changes in the pinning forces can be explained by the changes in the superconducting matrix and it can be assumed that the pinning centers do not change with the heat treatment.
Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
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Notes Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ luzuriag @ Serial 501
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