Publisher's Note: Two-fluid model for transport properties of granular superconductors [Phys. Rev. B74, 184526 (2006)]

Santos, C. A. M. dos; Oliveira, C. J. V.; Luz, M. S. da; Bortolozo, Ausdinir D.; Sandim, Maria José Ramos; Machado, A. J. S.

doi:10.1103/physrevb.74.229902

Cited by 11 publications

(19 citation statements)

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“…22 Further, metal mixed polymer superconductors may prove to be excellent system in which to study percolated 23,24 and granular superconductivity 25 and the competition between weak localization and superconductivity. 23,26 Finally, control of the substrate and/or implantation process could even allow for the controlled study of disorder in these systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation of metal mixed plastic superconductors: Electrical properties of tin-antimony thin films on plastic substrates

Stephenson

Divakar

Micolich

et al. 2009

Journal of Applied Physics

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Metal mixed polymers are a cheap and effective way to produce flexible metals and superconductors. As part of an on-going effort to learn how to tune the properties of these systems with ion implantation, we present a study of the electrical properties of these systems prior to metal-mixing. We show that the electrical properties of tin-antimony thin films are remarkably robust to variations in the substrate morphology. We demonstrate that the optical absorbance of the films at a fixed wavelength provides a reliable and reproducible characterization of the relative film thickness. We find that as the film thickness is reduced, the superconducting transition in the unimplanted thin films is broadened, but the onset of the transition remains at ∼3.7 K, the transition temperature of bulk Sn. This is in marked contrast to the behavior of metal mixed films, which suggests that the metal mixing process has a significant effect of the physics of the superconducting state beyond that achieved by reducing the film thickness alone.

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Section: Introductionmentioning

confidence: 99%

Preparation of metal mixed plastic superconductors: Electrical properties of tin-antimony thin films on plastic substrates

Stephenson

Divakar

Micolich

et al. 2009

Journal of Applied Physics

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“…35) In this state the spin ''up'' and spin ''down'' electrons occupy different sites with an anti-ferromagnetic pattern. There have been other recent studies of this effect, [36][37][38][39][40] some overlapping the time frame of this present study. The existence of a singlet or a higher spin ground state (radical) phase in the long acenes is connected to the influence of geometry of the perimeter on bipartite lattices.…”

Section: Linear Acenes-zigzag Edges With No Graphene Interiormentioning

confidence: 75%

Bonding and Magnetism in High Symmetry Nano-Sized Graphene Molecules: Linear Acenes C4m+2H2m+4 (m=2,…25); Zigzag Hexangulenes C6m2H6m (m=2,…10); Crenelated Hexangulenes C6(3m2−3m</I

Philpott

Cimpoesu²

2008

Mater. Trans.

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Plane wave based ab initio DTF all valence electron spin polarized calculations are reported for the electronic structure and geometry of differently shaped graphene molecules. These polycyclic hydrocarbon molecules comprise four series: D 2h symmetric linear polyacenes C 4mþ2 H 2mþ4 (m ¼ 2; . . . ; 25); D 6h hexagulenes with zigzag edges C 6m ÃÃ 2 H 6m (m ¼ 2; . . . ; 10); D 6h hexagulenes with crenelated edges C 6ð3m ÃÃ 2À3mþ1Þ H 6ð2mÀ1Þ (m ¼ 2; . . . ; 6); D 3h zigzag edged triangulenes C m ÃÃ 2þ4mþ1 H 6m (m ¼ 2; . . . 15). The systems variously display ground states that are spin paired singlet (S ¼ 0), singlet anti-ferromagnetically ordered diradical and spin polarized S ¼ 1=2ðm À 1Þ. Molecules with zigzag edges show evidence of electron delocalization along the perimeters with some bond alternation at the corners. In the acenes the spin paired singlet state of the short members switches to a singlet diradical at m % 7{8 and this remains as the ground state for larger m. In contrast the triangulenes are magnetic and the atomic charge and spin density changes monotonically with distance from center to perimeter. In the hexagonal systems the development of a graphene core region, where the C-C bonds are 142 pm, extends to within a few C-C bonds of the perimeter atoms. Zigzag hexagulenes have a spin paired singlet ground state for m 8 and a singlet diradical ground state for larger m. When hexagulenes are substitutionally doped with boron or nitrogen, acceptor or donor levels appear that track the valence or conduction band edges with increase in zigzag number. This result suggests the possibility of building several semiconductor device structures into the same graphene molecule.

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“…The investigated samples belong to the hole-doped Y 1−x Pr x Ba 2 Cu 3 O 7−δ (x = 0.0, 0.35, and 0.45) and electron-doped Sm 2−x Ce x CuO 4−δ (x = 0.18) systems. Furthermore this work provides experimental basis for the twofluid model for transport properties of granular superconductors published elsewhere [22].…”

Section: Introductionmentioning

confidence: 91%

Transport properties of granular high-T C superconductors

Luz¹,

Santos²,

Sandim³

et al. 2007

Braz. J. Phys.

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We report on the application of the Resistively Shunted Junction (RSJ) model to granular high T C superconductors. Some derived predictions of the RSJ model are applied to a set of superconducting granular samples which can be considered as a network of Josephson junctions. The investigated samples belong to both holedoped Y 1−x Pr x Ba 2 Cu 3 O 7−δ (x = 0.0, 0.35, and 0.45) and the electron-doped Sm 2−x Ce x CuO 4−δ (x = 0.18) systems which display the so-called double resistive superconducting transition. We have performed several transport measurements in these compounds including temperature and magnetic field dependence of the electrical resistance, R(T, H), and I-V characteristics. Several aspects of the I-V characteristics were quantitatively well described by the RSJ model. The combined results strongly suggest that dissipation in granular superconducting samples is a natural consequence of the normal current flowing in parallel with the supercurrent current.

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Publisher's Note: Two-fluid model for transport properties of granular superconductors [Phys. Rev. B74, 184526 (2006)]

Cited by 11 publications

References 0 publications

Preparation of metal mixed plastic superconductors: Electrical properties of tin-antimony thin films on plastic substrates

Preparation of metal mixed plastic superconductors: Electrical properties of tin-antimony thin films on plastic substrates

Transport properties of granular high-T C superconductors

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