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Author (up) Konstantinov, D.; Homsi, W.; Luzuriaga, J.; Su, C.-K.; Weilert, M.A.; Maris, H.J.
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 (up) Luzuriaga, J.
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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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 (up) Maiorov, B.; Osquiguil, E.
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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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 (up) Marconi V. I.; Pastoriza, H.; Domínguez, D.
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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Author (up) Pedrazzini, P.; Berisso, M.G.; Trovarelli, O.; Sereni, J.G.; Geibel, C.
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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ISSN 0022-2291 ISBN Medium
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Notes ISI:000189139000019 Approved no
Call Number BT @ hernan @ Serial 66
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Author (up) Schmoranzer, D., Jackson,M., Zemma, E., Luzuriaga,J.
Title Double-Paddle Oscillators as Probes of Quantum Turbulence in the Zero Temperature Limit Type Journal Article
Year 2016 Publication Journal of Low Temperature Physics Abbreviated Journal
Volume 185 Issue Pages
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Call Number BT @ pedrazp @ Serial 745
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Author (up) Schmoranzer, D.; Jackson, M.J.; Luzuriaga, J.
Title On the Non-linear Damping of Mechanical Oscillators in Flows of 4He Type Journal Article
Year 2014 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.
Volume 175 Issue 1 Pages 97-103
Keywords Resonator; Non-linear dissipation; Turbulence; Liquid helium
Abstract In the studies of both classical and quantum turbulence, significant attention is devoted to the investigation of the behavior of various submerged resonators. Upon entering the turbulent regime, the oscillators start to experience a significant drag force, which varies non-linearly with velocity. We present an empirical way of modeling such systems, and calculate the expected resonant response of such oscillators near the fundamental frequency as a function of the applied driving force. We apply the model to the crossover from linear to non-linear drag forces and compare with previous models as well as selected experimental data on the transition to turbulence in oscillatory flow of 4He.
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Publisher Springer US Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ Serial 663
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Author (up) Sereni, J.G.
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
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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 (up) Sereni, J.G.
Title Entropy Bottlenecks at T->0 in Ce-Lattice and Related Compounds Type Journal Article
Year 2015 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.
Volume 179 Issue 1-2 Pages 126-137
Keywords Heavy fermions; Specific heat anomalies; Entropy
Abstract A number of specific heat Cm anomalies are reported in Ce- and Yb-lattice compounds around 1 K which cannot be associated to usual phase transitions despite of their robust magnetic moments. Instead of a Cm(T) jump, these anomalies show coincident morphology: (i) a significant tail in Cm/T , with similar power law decay above their maxima ( T>Tm ), (ii) whereas a Cm(T2) dependence is observed below Tm . (iii) The comparison of their respective entropy gain Sm(T) indicates that ≈0.7R ln2 is condensed within the T>Tm tail, in coincidence with an exemplary spin-ice compound. Such amount of entropy arises from a significant increase of the density of low energy excitations, reflected in a divergent Cm(T>Tm)/T dependence. (iv) Many of their lattice structures present conditions for magnetic frustration. The origin of these anomalies can be attributed to an interplay between the divergent density of magnetic excitations at T→0 and the limited amount of degrees of freedom: Sm = R ln2 for a doublet-ground state. Due to this “entropy bottleneck,” the paramagnetic minimum of energy blurs out and the system slides into an alternative minimum through a continuous transition. A relevant observation in these very heavy fermion systems is the possible existence of an upper limit for Cm/TLimT→0 ≈7 J/mol K 2 observed in four Yb- and Pr-based compounds.
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Call Number BT @ pedrazp @ Serial 709
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Author (up) Sereni, J.G.
Title Peculiar thermal features of Ce-systems around their critical points Type Journal Article
Year 2007 Publication JOURNAL OF LOW TEMPERATURE PHYSICS Abbreviated Journal
Volume 147 Issue 3-4 Pages 179-197
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Abstract Some non-predicted thermal behavior observed in various Ce-lattice compounds close to their critical points are presented. From a comparison between phase diagrams driven by doping (x) and pressure, a pre-critical region (x* < x < x(cr)) is identified in the former group. Some systematic behaviors, observed in the specific heat (C-m/T) and the entropy gain, are recognized as characteristic features of that region. Different measured temperature dependencies of C-m/T are compared, detecting that the onset of the non-Fermi-liquid behavior occurs much closer to x* than x(cr). In a detailed analysis of the evolution of the thermal dependence within the pre-critical region, a further change in the T dependence is frequently observed before to reach the critical point. A generalized power law function is proposed to compare different systems, which allows to identify a low temperature C-m/T(T) anomaly that only involves about 0.01 x R ln 2 of entropy.
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Notes ISI:000245133000008 Approved no
Call Number BT @ hernan @ Serial 52
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