Symmetry properties and sound waves in the unconventional superconductor [strontium ruthenate]
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Symmetry properties and sound waves in the unconventional superconductor [strontium ruthenate] by Pedro Leonardo Contreras Escalante

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Published .
Written in English


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Detailed theories of the effect of the superconductivity of Sr2 RuO4 on the velocity and on the attenuation of sound waves are developed. Two results of particular importance come out of these studies. I show that the discontinuity in the elastic constant C66 at the superconducting transition temperature implies that the superconducting order parameter in Sr2RuO4 has two components and breaks time-reversal symmetry. In addition, I show how a detailed analysis of the ultrasonic attenuation experiments performed on Sr2RuO4 leads to a new model for the superconducting gap structure of Sr2RuO 4. Its symmetry, and the details of the three-band normal-state Fermi surface of Sr2RuO4, all play important roles in these studies.

Edition Notes

Statementby Pedro Leonardo Contreras Escalante.
The Physical Object
Paginationx, 111 leaves.
Number of Pages111
ID Numbers
Open LibraryOL19758354M
ISBN 109780494159200

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History. The superconducting properties of CeCu 2 Si 2, a type of heavy fermion material, were reported in by Frank Steglich. For a long time it was believed that CeCu 2 Si 2 is a singlet d-wave superconductor but since the mid s, this notion has been strongly contested. In the early eighties, many more unconventional, heavy fermion superconductors were discovered, including UBe Strontium ruthenate is structurally very similar to the high-temperature cuprate superconductors, and in particular, is almost identical to the lanthanum doped superconductor (La, Sr) 2 CuO 4. However, the transition temperature for the superconducting phase transition is K, which is much lower than the corresponding value for cuprates. Fluctuation Contributions to the Transport Properties of Hg Ba 2 Ca 2 Cu 3 O 8+δ and Bi 2 Sr Ca Cu 2 O 8 Polycrystalline Superconductors H. Bougrine, S. Dorbolo, R. . In this work, after reviewing the theory of the elastic properties of Strontium ruthenate, an extension suitable to explain the sound speed experiments of Lupien et. al. \protect\cite{lup2} and.

Abstract. Experimental data on purest Sr 2 RuO 4 single crystals clearly indicate the presence of nodes in the superconducting order parameter. Here, we consider one special p-wave order parameter symmetry and two two-dimensional f-wave order parameter symmetries having nodes within the RuO 2 plane. These states reasonably describe both speci.c heat and penetration depth calculate the. B. Quasiparticles in d-wave superconductors C. Surfaces and interfaces 1. Zero-bias conductance peaks 2. Time-reversal symmetry breaking 3. Josephson junctions in d-wave superconductors D. Vortex state VII. Conclusions Acknowledgments References I. INTRODUCTION The normal-to-superconducting phase. Recent work done on the time reversal symmetry (TRS) breaking superconductors is reviewed in this paper. The special attention is paid to Sr 2 RuO 4 believed to be spin triplet chiral p-wave superconductor which break TRS and is expected to posses non-trivial topological properties. The family of TRS breaking superconductors is growing relatively fast, with many of its newly discovered . An investigation of symmetry breaking in elementary particle physics: Copley, L.A.; Symmetry properties and sound waves in the unconventional superconductor strontium ruthenate: Contreras Escalante, Pedro Leonardo;

This thesis sheds important new light on the puzzling properties of Strontium Ruthenate. Using a sophisticated weak-coupling approach, exact within certain limits, it shows that proper treatment of spin-orbit and multi-band effects is crucial to the physics. Aspects of Symmetry in Unconventional Superconductors Manfred Sigrist, ETH Zurich Unconventional Superconductors Many novel superconductors show properties di erent from standard superconductors (overview); Aim of this lecture: discuss structure of Cooper pairs from a symmetry point of view - key symmetries: time reversal and inversion symmetry. We discuss a few possibilities of high- T c superconductivity with more than one orbital symmetry contributing to the pairing. First, we show that the high energies of orbital excitations in various cuprates suggest a simplified model with a single orbital of x 2 − y 2 symmetry doped by holes. Next, several routes towards involving both e g orbital symmetries for doped holes are. Until now, the history of superconducting materials has been a tale of two types: s-wave and d-wave. - This is Ultimate News Detail Page.