Ab initio study on pressure-induced change of effective Coulomb interaction in superconducting yttrium

Duck Young Kim; Ahuja, Rajeev
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p022510
Academic Journal
Ab initio lattice dynamics based on linear response method are performed for high pressure phase of yttrium to describe electron-phonon coupling and subsequent superconducting behavior. The critical temperature Tc in fcc-Y increases monotonically with pressure up to 9.25 K at 31 GPa, which is quantitatively in excellent agreement with two quasihydrostatic experiments and is qualitatively compatible with recent experiments. The excellent agreement with experiments gives us a better understanding of the effective pseudopotential μ* as well as spectral function α2(ω)F(ω) in yttrium. These results demonstrate that there exists strong electron-phonon coupling in Y within the studied pressure regime, and for lower pressure electron correlation becomes stronger. Generally, it is found that superconductivity in yttrium under pressure can be described quantitatively within standard theory of phonon-mediated superconductivity.


Related Articles

  • Analysis of local chemical and structural inhomogeneities in FeySe1-xTex single crystals. Speller, S. C.; Britton, T. B.; Hughes, G.; Lozano-Perez, S.; Boothroyd, A. T.; Pomjakushina, E.; Conder, K.; Grovenor, C. R. M. // Applied Physics Letters;11/7/2011, Vol. 99 Issue 19, p192504 

    Co-existence of superconductivity and magnetism has been reported in certain regions of the Fe(Se,Te) phase diagram. Here, we address the key question of whether these different properties occur simultaneously within a homogeneous crystal or whether a 'two-phase' description is more appropriate....

  • Adsorption of Barium and Rare-Earth Metals on Silicon. Davydov, S. Yu. // Physics of the Solid State;Jun2004, Vol. 46 Issue 6, p1141 

    The change in the work function of the Si(111) surface caused by deposition of a submonolayer film of barium has been calculated with due account of dipole–dipole adatom repulsion and metallization effects. The results of the calculations agree satisfactorily with experimental data. The...

  • Charge Ordering, Superconductivity, and Stripes in Doped La2CuO4. Mitsen, K. V.; Ivanenko, O. M. // Journal of Experimental & Theoretical Physics;Jun2005, Vol. 100 Issue 6, p1082 

    The special features of the phase diagrams of La2 – xSrxCuO4 are considered in terms of the high-temperature superconductivity model according to which the mechanism responsible for the anomalous properties of these compounds is the interaction of electrons with diatomic negative...

  • Two-component scenario, cuprate related gaps, and superconducting density. Kristoffel, Nikolai; Rubin, Pavel // Proceedings of the Estonian Academy of Sciences, Physics, Mathem;Jun2005, Vol. 54 Issue 2, p98 

    A simple model of cuprate superconductivity with an electron spectrum prepared by doping is developed. The pair-transfer interaction couples the itinerant band with two components ("hot" and "cold") of the defect subsystem. Basic defect-itinerant gaps are quenched by progressive doping. Band...

  • Effect of Pressure on Transport Properties of Heavy Fermion CePtSi2. Nakano, Tomohito; Ohashi, Masashi; Oomi, Gendo; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya // Journal of Superconductivity & Novel Magnetism;Jul2010, Vol. 23 Issue 5, p799 

    We measured the resistivity of heavy fermion CePtSi2 under pressure. At ambient pressure, CePtSi2 shows an antiferromagnetic (AF) transition at 2 K and a Fermi liquid like T2 dependence in resistivity below 1.5 K. With increasing pressure, the AF phase and T2 dependence are suppressed. Above 1.4...

  • Anomalous Magnetoresistivity of the Superconducting Zr80Pt20 System in Quasicrystalline and Amorphous States. Panova, G. Kh.; Chernoplekov, N. A.; Shikov, A. A. // Journal of Experimental & Theoretical Physics;Oct2005, Vol. 101 Issue 4, p680 

    The binary icosahedral Zr80Pt20 system has been synthesized during the crystallization of an initially amorphous alloy fabricated by melt quenching on the surface of a rotating copper wheel. The temperature and field dependences of the electrical resistivity and magnetoresistivity of the...

  • Competition Between Singlet and Triplet Superconductivity. Tian De Cao; Tie Bang Wang // Journal of Superconductivity & Novel Magnetism;Apr2010, Vol. 23 Issue 3, p361 

    The competition between singlet and triplet superconductivity is examined in consideration of correlations on an extended Hubbard model. It is shown that the triplet superconductivity may not be included in the common Hubbard model since the strong correlation favors the singlet...

  • Condensed matter physics: Some like it cold. Fox, Karen // Nature;3/24/2005, Vol. 434 Issue 7032, p430 

    The article focuses on issues related to the first ultracold quantum gas. The article states that over the past five years, Bose-Einstein condensate (BEC) physics has grown, not just in size but also in ambition. In theory, once a superfluid starts swirling it should continue forever. Some of...

  • Topology of the superconducting order under pairing repulsion. Belyavsky, V. I.; Kopaev, Yu. V.; Nguyen, N. T.; Tran, V. L. // Journal of Experimental & Theoretical Physics;Feb2009, Vol. 108 Issue 2, p301 

    The superconducting state with a large momentum of a pair in a doped insulator is controlled by the features of Coulomb pairing associated with the suppression of small momentum transfers during scattering owing to electron-phonon interaction and of large transfers due to redistribution of the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics