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| Author | Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. | ||||
| Title | Onset of the 0-dimensional vortex pinning behavior in the optimally doped and overdoped Bi2Sr2CaCu2O8+delta system | Type | Journal Article | ||
| Year | 2000 | Publication | PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | Abbreviated Journal | |
| Volume | 341 | Issue | Pages | 1285-1286 | |
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| Abstract | We report results of transverse AC magnetic permeability in the linear regime and DC magnetization loops for optimally doped and oxygen overdoped samples of Bi2Sr2CaCu2O8+delta The data cover the low temperature (T < 25K) and low held (H-a < 1000 Oe) region of the magnetic (H-a-T) phase diagram. In optimally doped as well as in overdoped samples a crossover to a O-dimensional pinning regime (Larkin length, L-C(C), shorter than the inter-plane CuO2 distance) is observed at a characteristic temperature Too for all investigated fields. The order-disorder transition, identified by the second peak in magnetization and a non monotonous field dependence of the AC penetration depth, is quenched below T-0D. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0921-4534 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000165855700242 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 221 | ||
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| Author | Kaul, E.E.; Nieva, G. | ||||
| Title | Oxygen doping effects on the magnetization of Bi2Sr2CaCu2O8+delta single crystalline system in the mixed state | Type | Journal Article | ||
| Year | 2000 | Publication | PHYSICA C | Abbreviated Journal | |
| Volume | 341 | Issue | Pages | 1343-1344 | |
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| Abstract | We present a systematic study of the oxygen overdoping effects on the de magnetization loops of Bi2Sr2CaCu2O8+delta single crystalline samples. The overdoping is produced by high oxygen pressure (from 1 to 190 bar) annealing at 500 degreesC. The super conducting critical temperature and the c-axis lattice parameter are used to identify the oxygen content of the samples. The dc magnetization loop measurements are performed with the applied magnetic field parallel to the c-axis of the crystals. The characteristic second peak in the magnetization is present far all the investigated oxygen contents. We show that the position of this second peak and the irreversibility field increase monotonically as a function of oxygen doping. | ||||
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| ISSN | 0921-4534 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000165855700271 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 222 | ||
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| Author | Niebieskikwiat, D.; Civale, L.; Balseiro, C.A.; Nieva, G. | ||||
| Title | Nonglassy relaxation by double kinks in YBa2Cu3O7-delta with columnar defects | Type | Journal Article | ||
| Year | 2000 | Publication | PHYSICAL REVIEW B | Abbreviated Journal | |
| Volume | 61 | Issue | 10 | Pages | 7135-7141 |
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| Abstract | We present long-term relaxation measurements of the irreversible magnetization in YBa2Cu3O7-delta Single crystals with columnar defects. Within the single vortex pinning regime we find a nonglassy response at intermediate currents, in between the half loops and superkinks glassy regimes. We demonstrate that such behavior is due to double kink excitations whose critical nucleus has a size independent of current, and occur even in the presence of pinning energy dispersion. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1098-0121 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000085985800092 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 229 | ||
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| Author | Decca, R.S.; Drew, H.D.; Osquiguil, E.; Maiorov, B.; Guimpel, J. | ||||
| Title | Anomalous proximity effect in underdoped YBa2Cu3O6+x Josephson junctions | Type | Journal Article | ||
| Year | 2000 | Publication | Physical Review Letters | Abbreviated Journal | Phys Rev Lett |
| Volume | 85 | Issue | 17 | Pages | 3708-3711 |
| Keywords | Critical currents; Energy gap; High temperature superconductors; Magnetic field effects; Magnetron sputtering; Mathematical models; Phase diagrams; Phase transitions; Physical properties; Scanning electron microscopy; Superconductivity; Yttrium barium copper oxides; Anomalous proximity effect; Fluctuating phase models; Josephson effect; Photodoping; Josephson junction devices | ||||
| Abstract | Experiments were carried out to probe the underdoped insulating material by the Josephson effect. Junctions were fabricated by exploiting the capability of locally photodoping insulating RBa2Cu3O6+x (R = rare earth) material. The existence of an anomalously large proximity effect was confirmed. The critical current of the junctions was consisted with the conventional Josephson relationship. | ||||
| Address | Centro At | ||||
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| Publisher | American Inst of Physics | Place of Publication | Woodbury, NY, United States | Editor | |
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| ISSN | 00319007 (ISSN) | ISBN | Medium | ||
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| Notes | Cited By (since 1996): 36; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; doi: 10.1103/PhysRevLett.85.3708; Language of Original Document: English; Correspondence Address: Decca, R.S.; Univ of Maryland College Park, United States; References: Ginsberg, D.M., (1996) Physical Properties of High Temperature Superconductors V, , World Scientific, Singapore; Zhang, S.C., (1997) Science, 275, p. 1089; Emery, V.J., Kivelson, S.A., (1995) Nature (London), 374, p. 434; Corson, J., (1999) Nature (London), 398, p. 291; Renner, Ch., (1998) Phys. Rev. Lett., 80, p. 149; Demler, E., (1998) Phys. Rev. Lett., 80, p. 2917; Den Hertog, B.C., Berlinsky, A.J., Kallin, C., (1999) Phys. Rev. B, 59, pp. R11645; Emery, V.J., Kivelson, S.A., Zachar, O., (1997) Phys Rev. B, 56, p. 6120; Tinkham, M., (1996) Introduction to Superconductivity, , McGraw-Hill, New York; Decca, R.S., (1998) Appl. Phys. Lett., 73, p. 120; (1999) J. Microsc., 194, p. 407; Osquiguil, E., (1992) Appl. Phys. Lett., 60, p. 1627; Kudinov, V.I., (1993) Phys. Rev. B, 47, p. 9017; Decca, R.S., Drew, H.D., Empson, K.L., (1997) Appl. Phys. Lett., 70, p. 1932; Orenstein, J., (1990) Phys. Rev. B, 42, p. 6342; Nieva, G., (1992) Appl. Phys. Lett., 60, p. 2159; (1992) Phys. Rev. B, 46, p. 14249; notenoteGray, K.E., (1992) Phys. Rev. B, 45, p. 10071; Pauza, A.J., (1997) J. Appl. Phys., 82, p. 5612; Katz, A.S., Woods, S.I., Dynes, R.C., (2000) J. Appl. Phys., 87, p. 2978; noteUR – http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-19244384844&partnerID=40 | Approved | no | ||
| Call Number | BT @ osquigui @ | Serial | 373 | ||
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