2015 CAP Congress / Congrès de l'ACP 2015

Session

T1-1 Superconductivity (DCMMP) / Supraconductivité (DPMCM)

T1-1

16 Jun 2015, 08:45

University of Alberta

Conveners

T1-1 Superconductivity (DCMMP) / Supraconductivité (DPMCM)

• Tatiana Rappoport (Federal University of Rio de Janeiro)

823. Scanning Tunneling Spectroscopy of LiFeAs

Prof. D,A. Bonn (University of British Columbia)

16/06/2015, 08:45

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Invited Speaker / Conférencier invité

LiFeAs is one of several pnictide and chalcogenide superconductors that can be grown in single-crystal form with relatively few defects. Spectroscopy away from any native defects reveals a spatially uniform superconducting gap, with two distinct gap edges. Quasiparticle interference over the gap energy range provides evidence for an S+- pairing state. We further explore the spectroscopy of...

820. Interplay of charge density waves and superconductivity

Kaori Tanaka (University of Saskatchewan)

16/06/2015, 09:15

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Invited Speaker / Conférencier invité

We examine possible coexistence or competition between charge density waves (CDW) and superconductivity (SC) in terms of the extended Hubbard model. The effects of band structure, filling factor, and electron-phonon interactions on CDW are studied in detail. In particular, we show that van Hove singularities per se can lead to the formation of CDW, due to a substantial energy gain by...

745. Quantum oscillation studies of quantum criticality in PrOs${}_4$Sb${}_{12}$

Dr Stephen Julian (University of Toronto)

16/06/2015, 09:45

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral (Non-Student) / orale (non-étudiant)

PrOs$4$Sb$12$ is a cubic metal with an exotic superconducting ground state below 1.8 K. The crystal fields around the Pr site are such that it has a singlet ground state and a magnetic triplet just 8K above the ground state. Under an applied magnetic field, the triplet splits, and the S${}_z=+1$ state crosses the singlet state at easily accessible magnetic fields. In the region of the...

474. A Variational Wave Function for Electrons coupled to Acoustic Phonons

Carl Chandler (University of Alberta)

16/06/2015, 10:00

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition)

We survey briefly the electron-phonon interactions in metals with an emphasis on applications in electron-phonon mediated superconductivity. While BCS theory and Eliashberg theory have significant predictive power, the microscopic Hamiltonians for the processes they describe are still an open area of study. We will examine the hitherto unsolved BLF-SSH model of electrons interacting with...