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Author Guimpel, J.; de la Cruz, M.E.; de la Cruz, F.; Fink, H.J.; Laborde, O.; Villegier, J.C. url  doi
openurl 
  Title Size dependence of the Superconducting critical temperature and fields of Nb/Al multilayers Type Journal Article
  Year 1986 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 63 Issue 1-2 Pages 151-165  
  Keywords  
  Abstract The critical temperatureT cof Nb/Al multilayers decreases as the total sample thicknessd Tis decreased while the thickness of each Nb and Al layer is kept constant. To understand this behavior, models based on the proximity effect and on weak two-dimensional (2D) localization are employed. The latter uses a characteristic length, the thermal diffusion length, in relation tod Tto obtain 2D behavior and leads to a reasonable explanation ofT c(d T). It is also found that the slope atT c(d T) of the critical magnetic field perpendicular to the layers is independent ofd Twhen the Nb and Al layer thicknesses are kept constant. The angular dependence of the critical field is also measured.  
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  ISSN 0022-2291 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:A1986C112200008 Approved no  
  Call Number BT @ hernan @ Serial 193  
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Author Sereni, J.G. url  doi
openurl 
  Title Entropy Constraints in the Ground State Formation of Magnetically Frustrated Systems Type Journal Article
  Year 2017 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 190 Issue 1-2 Pages 1-19  
  Keywords  
  Abstract A systematic modification of the entropy trajectory (Sm(T)) is observed at very low temperature in magnetically frustrated systems as a consequence of the constraint (Sm≥0) imposed by the Nernst postulate. The lack of magnetic order allows to explore and compare new thermodynamic properties by tracing the specific heat (Cm) behavior down to the sub-Kelvin range. Some of the most relevant findings are: (i) a common Cm/T|T→0≈7 J/mol K2 ‘plateau’ in at least five Yb-based very-heavy-fermions (VHF) compounds; (ii) quantitative and qualitative differences between VHF and standard non-Fermi-liquids; (iii) entropy bottlenecks governing the change of Sm(T) trajectories in a continuous transition into alternative ground states. A comparative analysis of Sm(T→0) dependencies is performed in compounds suitable for adiabatic demagnetization processes according to their ∂2Sm/∂T2 derivatives.  
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  Call Number BT @ pedrazp @ Serial 776  
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Author Sereni, J.G.; Huber, J.G.; Luengo, C.A.; Maple, M.B. url  doi
openurl 
  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  
  Keywords  
  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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Author Maiorov, B.; Osquiguil, E. url  openurl
  Title Bose-glass-like phases in oriented-twin YBa2Cu3O7-? crystals Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 135 Issue 1-2 Pages 131-134  
  Keywords Low temperature effects; Magnetic fields; Superconducting materials; Bose-glass phases; Planar random defect array; Yttrium barium copper oxides; physics  
  Abstract We experimentally study the dynamical response of the superconducting vortex system near the solid-liquid transition by applying forces parallel and perpendicular to a planar random defect array. Our results show that for magnetic fields above a certain critical field Hcr'? 4 T the solid glassy vortex phase in YBa2Cu3O7-? crystals with oriented twin planes does not correspond to the so-called Bose-glass phase.  
  Address Centro At  
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  ISSN 00222291 (ISSN) ISBN Medium  
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  Notes Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Superconductivity Technology Center; Los Alamos Laboratory Los Alamos, NM 87545, United States; References: Crabtree, G., Nelson, D.R., (1997) Phys. Today, 50, p. 38. , and references therein; Nelson, D.R., Vinokur, V.M., (1993) Phys. Rev. Lett., 68, p. 2398. , J. Lidmar and M. Wallin, Europhys. Lett. 47, 494 (1999); Grigera, S.A., (1998) Phys. Rev. Lett., 81, p. 2348; Maiorov, B., Osquiguil, E., (2001) Phys. Rev. B, 64, p. 052511; Maiorov, B., Nieva, G., Osquiguil, E., (2000) Phys. Rev. B., 61, p. 12427; Grigera, S.A., (2001) Phys. Rev. B., 63, p. 212509 Approved no  
  Call Number BT @ osquigui @ Serial 367  
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Author Luzuriaga, J. url  doi
openurl 
  Title Measurements in the laminar and turbulent regime of superfluid4He by means of an oscillating sphere Type Journal Article
  Year 1997 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 108 Issue 3-4 Pages 267-277  
  Keywords Calculations; Laminar flow; Oscillations; Spheres; Turbulence; Turbulent flow; Vibrations (mechanical); Oscillating sphere; Translational oscillation; Superfluid helium  
  Abstract The translational oscillations of a sphere in liquid helium have been measured as a way of studying superfluid turbulence. Experiments were carried out in the laminar flow regime for reference purposes, and good agreement found between measured and calculated quantities. In the turbulent region, the dissipation is found to be proportional to the square of the velocity of the sphere, as found previously by other workers. For high vibration amplitudes there is an increase in the hydrodynamic mass. This seems to scale with the superfluid fraction in a way that strongly suggests that the superfluid component plays an important role in the turbulent regime.  
  Address Comisi  
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  ISSN 00222291 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Comisi Approved no  
  Call Number BT @ luzuriag @ Serial 518  
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Author Konstantinov, D.; Homsi, W.; Luzuriaga, J.; Su, C.-K.; Weilert, M.A.; Maris, H.J. url  doi
openurl 
  Title How Does a Bubble Chamber Work? Type Journal Article
  Year 1998 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 113 Issue 3-4 Pages 485-490  
  Keywords Bubbles (in fluids); Charged particles; Helium; Hydrogen; Mathematical models; Vapor pressure; Bubble chamber; Saturated vapor pressure; Superfluid helium  
  Abstract A charged particle passing through a bubble chamber produces a track of bubbles. The way in which these bubbles are produced has been a matter of some controversy. We consider the possibility that in helium and hydrogen bubble chambers the production of bubbles is primarily a mechanical process, rather than a thermal process as has often been assumed. The model we propose gives results which are in excellent agreement with experiment.  
  Address CNEA, Centro Atomico, (8400) Bariloche, Argentina  
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  ISSN 00222291 (ISSN) ISBN Medium  
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  Notes Cited By (since 1996): 6; Export Date: 28 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Konstantinov, D.; Department of Physics; Brown University Providence, RI 02912, United States; References: Glaser, D.A., (1952) Phys. Rev., 87, p. 665; Glaser, D.A., (1953) Phys. Rev., 91, p. 762; Glaser, D.A., (1954) Nuovo Cimento, 11, p. 361; Seitz, F., (1958) Phys. Fluids, 1, p. 2; Tenner, A.G., (1962) Nucl. Inst. and Meths., 22, p. 1; Rosenblit, M., Jortner, J., (1995) Phys. Rev. Lett., 75, p. 4079; Classen, J., Su, C.-K., Mohazzab, M., Maris, H.J., (1998) Phys. Rev. B, 57, p. 3000; Akulichev, V.A., (1986) Ultrasonics, 24, p. 8; Aleksandrov, Y.A., (1968) Bubble Chambers, , Indiana, Bloomington Approved no  
  Call Number BT @ luzuriag @ Serial 480  
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Author Zemma, E.; Tsubota, M.; Luzuriaga, J. url  doi
openurl 
  Title Possible visualization of a superfluid vortex loop attached to an oscillating Beam Type Journal Article
  Year 2015 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 179 Issue 5 Pages 310-319  
  Keywords Quantum fluids; Superfluid helium; Flow visualization; Vortex loops  
  Abstract Visualization using tracer particles is a relatively new tool available for the study of superfluid turbulence and flow, which is applied here to oscillating objects submerged in the liquid. We report observations of a structure seen in videos taken from outside a cryostat filled with superfluid helium at 2 K, which is possibly a vortex loop attached to an oscillator. The feature, which has the shape of an incomplete arch, is visualized due to the presence of solid H2 tracer particles and is attached to a beam oscillating at 38 Hz in the liquid. It has been recorded in videos taken at 240 frames per second, fast enough to take ∼6 images per period. This makes it possible to follow the structure, and to see that it is not rigid. It moves with respect to the oscillator, and its displacement is in phase with the velocity of the moving beam. Analyzing the motion, we come to the conclusion that we may be observing a superfluid vortex attached to the beam and decorated by the hydrogen particles. An alternative model, considering a solid hydrogen filament, has also been analyzed, but the observed phase between the movement of the beam and the filamentary structure is better explained by the superfluid vortex hypothesis.  
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  Call Number BT @ pedrazp @ Serial 734  
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Author Shalóm, D. E.; Pastoriza, H. doi  openurl
  Title Experimental Method to Measure Anisotropic Transport in 2D Superconductors Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal  
  Volume 135 Issue Pages 153-156  
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  Abstract A two-coil kinetic inductance technique for measuring anisotropic response in two-dimensional (2D) superconductors is presented. Serpentine-shaped coils are lithographically patterned directly on top of the sample, separated by isolation layers. The drive and receive coils are positioned in a way that enhances signal from longitudinal currents and reduces transversal ones, maximizing the ratio. Anisotropic transport can be directly measured with this technique, even when anisotropy is induced by the transport current.  
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  Call Number BT @ hernan @ shalom04a Serial 43  
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Author Pedrazzini, P.; Berisso, M.G.; Trovarelli, O.; Sereni, J.G.; Geibel, C. doi  openurl
  Title Evolution of the ground state in the ternary system CeT2Si2 (T=Cu, Rh and Pd) Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.  
  Volume 135 Issue 1-2 Pages 143-146  
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  Abstract The heavy fermion compounds CeCu2Si2, CeRh2Si2 and CePd2Si2 have been intensively investigated due to the non-conventional relation between superconductivity and magnetism. We have studied these compounds as constituents of a ternary system, where the Ce(RhxCu1-x)(2)Si-2, Ce(PdyRh1-y)(2)Si-2 and Ce(CuzPd1-z)(2)Si-2 alloys span the sides of a triangle with the respective stoichometric compounds at each vertex. In this article we discuss the evolution of the ground state throughout this ternary system, and we analyse (by means of the electrical resistivity) the influence of doping-induced disorder on the Kondo and magnetic ordering temperatures.  
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  Notes ISI:000189139000019 Approved no  
  Call Number BT @ hernan @ Serial 66  
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Author Marconi V. I.; Pastoriza, H.; Domínguez, D. doi  openurl
  Title Transverse voltage in disordered Josephson junction arrays with diagonal bias Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal  
  Volume 135 Issue Pages 135-138  
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  Abstract We study numerically the effect of disorder in the transport properties of square Josephson junction arrays with a dc current applied in the diagonal direction ([11] direction). We obtain a finite transverse voltage in this case when we consider the presence of disorder in the critical currents of the junctions. We show that this behavior is in good agreement with previous experimental, results in square arrays with a diagonal current drive.  
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  Call Number BT @ hernan @ marconi04 Serial 27  
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