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Author Neerinck, D.; Temst, K.; Baert, M.; Osquiguil, E.; Van Haesendonck, C.; Bruynseraede, Y.; Gilabert, A.; Schuller, I.K.
Title Softening of the flux line lattice in Ge/Pb multilayers Type Journal Article
Year 1992 Publication Superconductor Science and Technology Abbreviated Journal (up)
Volume 5 Issue 1S Pages
Keywords
Abstract The authors measured the critical current density Jc of artificially grown Ge/Pb multilayers as a function of the magnetic field H perpendicular to applied perpendicular to the layers. In these layered structures Jc(Hperpendicular to) rapidly drops to a pronounced minimum at a field H*perpendicular to, then increases through a broad maximum and finally decays to zero at H c2 perpendicular to. The systematic evolution of this minimum as a function of temperature, layer thickness and pinning strength allows us to conclude that this peculiar behavior is due to a thermally driven softening of the flux line lattice which can be related either to a magnetic decoupling or a melting of the vortex structure.
Address Lab. voor Vaste Stof-Fysika en Magn., Katholieke Univ., Leuven, Belgium
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ISSN 09532048 (ISSN) ISBN Medium
Area Expedition Conference
Notes Export Date: 17 April 2009; Source: Scopus; Art. No.: 029; doi: 10.1088/0953-2048/5/1S/029; Language of Original Document: English; Correspondence Address: Neerinck, D.; Lab. voor Vaste Stof-Fysika en Magn.; Katholieke Univ. Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 408
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Author Neerinck, D.; Temst, K.; Baert, M.; Osquiguil, E.; Van Haesendonck, C.; Bruynseraede, Y.; Gilabert, A.; Schuller, I.K.
Title Transition in the flux lattice of artificially layered superconductors Type Journal Article
Year 1991 Publication Physical Review Letters Abbreviated Journal (up)
Volume 67 Issue 18 Pages 2577-2580
Keywords
Abstract We report a novel magnetic-field dependence of the critical-current density Jc in artificially grown Ge/Pb superlattices. In these layered structures Jc exhibits an unexpected minimum as a function of perpendicular applied field, unlike any ever observed in other superconductor systems. The systematic evolution of this minimum as a function of layer thicknesses, temperature and pinning strength is related to either flux-lattice decoupling or melting.
Address Department of Physics, University of California, San Diego, La Jolla, CA 92093-0319
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 00319007 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 7; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevLett.67.2577; Language of Original Document: English; Correspondence Address: Neerinck, D.; Laboratorium voor Vaste Stof-Fysika en Magnetisme; Katholieke Universiteit Leuven B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 411
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Author Hoffmann, A.; Nieva, G.; Guimpel, J.; Bruynseraede, Y.; Santamaria, J.; Lederman, D.; Schuller, I.K.
Title Comment on “Photoemission study of YBa2Cu3Oy thin films under light illumination” Type Journal Article
Year 2006 Publication PHYSICAL REVIEW LETTERS Abbreviated Journal (up)
Volume 97 Issue 11 Pages 119701
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ISSN 0031-9007 ISBN Medium
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Notes ISI:000240545600075 Approved no
Call Number BT @ hernan @ Serial 154
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Author Guimpel, J.; Høghøj, P.; Schuller, I.K.; Vanacken, J.; Bruynseraede, Y.
Title Scaling of the irreversibility line in a low temperature superconducting oxide Type Journal Article
Year 1991 Publication Physica C: Superconductivity Abbreviated Journal (up)
Volume 175 Issue 1-2 Pages 197-201
Keywords
Abstract We have studied the critical field and irreversibility line on the magnetization of the ceramic oxide LiTi2O4. The irreversibility line scales with the critical field while the coherence length of the material changes by a factor of two. This universal behavior indicates that the origin of the irreversibility line does not depend on extrinsic factors and relies solely on the intrinsic superconducting parameters of the material.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4534 ISBN Medium
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Notes Approved no
Call Number BT @ jguimpel @ Serial 615
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Author 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 (up) Appl. Phys. Lett.
Volume 60 Issue 17 Pages 2159-2161
Keywords
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
Corporate Author Thesis
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 00036951 (ISSN) ISBN Medium
Area Expedition Conference
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 Osquiguil, E.; Maenhoudt, M.; Wuyts, B.; Bruynseraede, Y.; Lederman, D.; Nieva, G.; Guimpel, J.; Schuller, I.K.
Title Photoexcitation effects in YBa2Cu3Ox Type Journal Article
Year 1993 Publication Journal of Alloys and Compounds Abbreviated Journal (up) J Alloys Compd
Volume 195 Issue C Pages 667-670
Keywords Barium compounds; Ceramic materials; Copper oxides; High temperature superconductors; Oxides; Photoelectricity; Yttrium compounds; C-axis oriented films; Photoexcitation effects; Photoinduced phenomena; Yttrium barium cuprates; Superconducting films
Abstract We show through photoexcitation experiments carried out on YBa2Cu3Ox c-axis oriented films that photoinduced phenomena are not restricted to insulating samples. Superconducting films with critical temperatures varying between 2 K and 40 K show a clear enhancement of the superconducting transition after illumination. The increase in Tc is accompanied by a corresponding decrease in the resistivity ?, and an increase in the Hall coefficient RH, indicative of an increased carrier density. Furthermore, the carrier mobility is also affected by illumination.
Address Physics Department – 0319, University of California – San Diego, La Jolla, CA 92093-0319, United States
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 09258388 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 4; Export Date: 17 April 2009; Source: Scopus; CODEN: JALCE; Language of Original Document: English; Correspondence Address: Osquiguil, E.; Laboratorium voor Vaste Stof-Fysika en Magnetisme; Katholieke Universiteit Leuven B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 401
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Author Lederman, D.; Osquiguil, E.; Nieva, G.; Guimpel, J.; Hasen, J.; Bruynseraede, Y.; Schuller, I.K.
Title Photoinduced enhancement of superconductivity Type Journal Article
Year 1994 Publication Journal of Superconductivity Abbreviated Journal (up) J Supercond
Volume 7 Issue 1 Pages 127-130
Keywords photoconduction; Superconductivity; thin films; Copper oxides; Hall effect; Order disorder transitions; Radiation effects; Superconductivity; X ray analysis; Josephson coupling; Oxide superconductors; Yttrium barium cuprates; High temperature superconductors
Abstract The photoinduced enhancement of superconductivity in RBa2Cu3Ox (R=rare earth or yttrium) and PryR1-yBa2Cu3Ox was explored through temperature-dependent resistivity, Hall coefficient and mobility, and x-ray diffraction measurements. The increases in Tc are enhanced near the metal-insulator transition, although photoinduced changes always exist in oxygendeficient samples. Several explanations, including intergrain Josephson coupling, photoassisted oxygen ordering, and the trapping of photogenerated electrons in oxygen vacancies, are discussed.
Address Centro At
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Publisher Kluwer Academic Publishers-Plenum Publishers Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 08961107 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: JOUSE; doi: 10.1007/BF00730382; Language of Original Document: English; Correspondence Address: Lederman, D.; Physics Department; University of California; San Diego La Jolla, 92093-0319, California, United States Approved no
Call Number BT @ osquigui @ Serial 397
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Author Martin, J.I.; Wuyts, B.; Maenhoudt, M.; Osquiguil, E.; Vicent, J.L.; Moshchalkov, V.V.; Bruynseraede, Y.
Title Sign reversal of the flux flow Hall effect in oxygen deficient YBa2Cu3Ox films Type Journal Article
Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal (up) Phys C Supercond Appl
Volume 235-240 Issue PART 2 Pages 1451-1452
Keywords
Abstract The Hall effect of high temperature superconductors has been reported to slow in some cases a striking sign reversal near Tc, the origin of which is not yet fully understood. We report on measurements of the Hall effect in the mixed state of oxygen deficient YBa2Cu3Ox thin films, for 7?
Address Laboratorium voor Vaste Stof-Fysika en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 09214534 (ISSN) ISBN Medium
Area Expedition Conference
Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Martin, J.I.; Dpto. Fisica de Materiales; Facultad de Ciencias Fisicas; Universidad Complutense 28040 Madrid, Spain Approved no
Call Number BT @ osquigui @ Serial 386
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Author Libbrecht, S.; van Dalen, A.J.J.; Wuyts, B.; Maenhoudt, M.; Gao, Z.X.; Osquiguil, E.; Griessen, R.; Bruynseraede, Y.
Title Magnetic properties of oxygen deficient Yba2Cu3Ox thin films Type Journal Article
Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal (up) Phys C Supercond Appl
Volume 235-240 Issue PART 5 Pages 2889-2890
Keywords
Abstract We have invesitgated several superconducting properties of oxygen defiecient YBa2Cu3Ox thin films, with oxygen contents ranging from x = 6.55 to x = 7. By means of torque magnetometry, the temperature dependence of the superconducting current dendity js and relaxation rate of the magnetization Q is measured in an (almost perpendicular) applied magnetic induction of 0.6 T. As the oxygen content is reduced, js decreases, whereas Q increases. Both properties are influenced by the decreased dpoing level as well as the enhanced anisotropy of oxygen depleted YBa2Cu3Ox. Using the Generalixed Inversion Scheme derived by Schnak et al. we obtain the current dependence of the activation energy U(f). We show that U(j) is lowered when the oxygen content is reduced.
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Series Editor Series Title Abbreviated Series Title
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ISSN 09214534 (ISSN) ISBN Medium
Area Expedition Conference
Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Libbrecht, S.; Laboratorium voor Vaste-Stoffysika en Magnetisme; Katholieke Universiteit B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 387
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Author Wuyts, B.; Maenhoudt, M.; Libbrecht, S.; Gao, Z.X.; Osquiguil, E.; Moshchalkov, V.V.; Bruynseraede, Y.
Title Linear relation between the Hall angle slope and the carrier density in YBa2Cu3Ox films Type Journal Article
Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal (up) Phys C Supercond Appl
Volume 235-240 Issue PART 2 Pages 1369-1370
Keywords
Abstract A universal relation cot?H??{variant}/RHB = ?T2 + C for the Hall angle ?H has been experimentally observed served in a wide variety of high-Tc systems. In contrast to the linear temperature dependence of the resistivity ?{variant} or the inverse Hall coefficient R-1H, the T2-dependence of cot?H remains valid in under- and overdoped systems. We present a systematic study of cot?H(T) in oxygen deficient epitaxial YBa2Cu3Ox thin films. We find evidence for a linear relation between ?, the slope of cot?H versus T2, and the carrier concentration. Moreover, we find a steep increase in the intercept C = cot?H (T = 0) below x ? 6.6.
Address Laboratorium voor Vaste-Stoffysika en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200D, B-3001 Leuven, Belgium
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 09214534 (ISSN) ISBN Medium
Area Expedition Conference
Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Wuyts, B.; Laboratorium voor Vaste-Stoffysika en Magnetisme; Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 392
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