Journal of Physics Condensed Matter (J PHYS-CONDENS MAT)

Publications in this journal

• Article: Nanocrystalline Nd2Fe17 synthesized by high-energy ball milling: Crystal structure, microstructure and magnetic properties

  P. Álvarez, P. Gorria, V. Franco, J.S. Marcos, M.J. Pérez, J.L. Sánchez Llamazares, I.P. Orench, J.A. Blanco
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  ABSTRACT: Cited By (since 1996): 6, Export Date: 28 May 2012, Source: Scopus, Art. No.: 216005
  Journal of Physics Condensed Matter 04/2013; 22(21).
• Article: Magnetic properties, structures and resistivity of the GdN1-xCux compounds

  J A Blanco, J C Gomez Sal, J Rodriguez Fernandez, D. Gignoux, D Schmitt, J Rodriguez Carvajal
  Journal of Physics Condensed Matter 04/2013;
• Article: Analysis of the diffraction-line broadening on nanostructured Fe: Size-strain effects induced by milling and heating

  D. Martínez-Blanco, P. Gorria, J.A. Blanco, M.J. Pérez, J. Campo
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  ABSTRACT: Cited By (since 1996): 27, Export Date: 28 May 2012, Source: Scopus, Art. No.: 335213
  Journal of Physics Condensed Matter 04/2013; 20(33).
• Article: Antiferro-quadrupolar structures in UPd3 inferred from x-ray resonant Bragg diffraction

  J Fernandez-Rodriguez, SW Lovesey, JA Blanco
  Journal of Physics Condensed Matter 04/2013;
• Article: Interlayer penetration depth in the pseudogap phase of cuprate superconductors

  J.P. Carbotte, E. Schachinger
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  ABSTRACT: The opening of a pseudogap in the electronic structure of the underdoped high $T_c$ cuprates has a profound effect on superconducting properties. Here we consider the $c$-axis penetration depth. A phenomenological model of the pseudogap due to Yang, Rice, and Zhang (YRZ) is used. It is based on the idea of a resonating valence bond spin liquid. A simplifying limit, the arc model, is also considered as it provides useful analytic formulas. The zero temperature value of the superfluid density $n_s(T=0)$ is generally reduced with increasing values of the pseudogap $(\Delta_{pg})$. This value reflects the reconstruction of the Fermi surface from the large contour of Fermi liquid theory to ever smaller Luttinger pockets as $\Delta_{pg}$ becomes larger. Also, as temperature is increased the ratio $n_s(T)/n_s(0)$ as a function of the reduced temperature $t=T/T_c$ decreases more rapidly than in the superconducting Fermi liquid ($\Delta_{pg} = 0$) as states which have both superconducting and pseudogap become more significantly sampled.
  Journal of Physics Condensed Matter 04/2013; 25(16):165702.
• Article: Journal of Physics Condensed Matter

  Satoshi Numazawa, Roger Smith
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  ABSTRACT: The formation of ripple structures on ion bombarded semiconductor surfaces is examined theoretically. Previous models are discussed and a new nonlinear model is formulated, based on the infinitesimal local atomic relocation induced by elastic nuclear collisions in the early stages of collision cascades and an associated density change in the near surface region. Within this framework ripple structures are shown to form without the necessity to invoke surface diffusion or large sputtering as important mechanisms. The model can also be extended to the case where sputtering is important, and it is shown that in this case certain 'magic' angles can occur at which the ripple patterns are most clearly defined. The results are in very good agreement with experimental observations.
  Journal of Physics Condensed Matter 03/2013; 25:095003.
• Article: Rubber friction for tire tread compounds on road surfaces

  B. Lorenz, Persson B.N.J, Fortunato G, Giustiniano M, Baldoni F
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  ABSTRACT: We have measured the surface topography and calculated the surface roughness power spectrum for an asphalt road surface. For the same surface we have measured the friction for a tire tread compound for velocities 10^-6 m s^-1 < v < 10^-3 m s^-1 at three different temperatures (at -8°�C, 20°�C and 48°�C). The friction data was shifted using the bulk viscoelasticity shift factor aT to form a master curve. We have measured the effective rubber viscoelastic modulus at large strain and calculated the rubber friction coefficient (and contact area) during stationary sliding and compared it to the measured friction coefficient. We find that for the low velocities and for the relatively smooth road surface we consider, the contribution to friction from the area of real contact is very important, and we interpret this contribution as being due to shearing of a very thin confined rubber smear film.
  Journal of Physics Condensed Matter 03/2013; 25(9):095007.
• Article: Density functional simulations of structure and polymorphism in Ga/Sb films

  J. Kalikka, J. Akola, R.O. Jones
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  ABSTRACT: Thin films of gallium/antimony alloys are promising candidates for phase change memories requiring rapid crystallization at high crystallization temperatures. Prominent examples are the stoichiometric form GaSb and alloys near the eutectic composition GaSb7, but little is known about their amorphous structures or the differences between the 'as-deposited' (AD) and 'melt-quenched' (MQ) forms. We have generated these structures using 528-atom density functional/molecular dynamics simulations, and we have studied in detail and compared structural parameters (pair distribution functions, structure factors, coordination numbers, bond and ring size distributions) and electronic properties (densities of states, bond orders) for all structures. There is good agreement with x-ray diffraction data from deposited films of GaSb, and there is evidence for Sb segregation in GaSb7.
  Journal of Physics Condensed Matter 02/2013; 25:115801.