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Condensed Matter Seminar

Joe Ross
Speaker: Joe Ross Title: Presentation for new graduate students Abstract: Host: Joe Ross

1 Sep 2017, 4:00PM | MIST M102
Hosted By: Joe Ross


Lucia Steinke, TAMU
Speaker: Lucia Steinke, TAMU Title: TBA Abstract: Host: Ar. Abanov

8 Sep 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Helmut Katzgraber, TAMU
Speaker: Helmut Katzgraber, TAMU Title: TBA Abstract: Host: Helmut Katzgraber

15 Sep 2017, 4:00PM | MIST M102
Hosted By: Helmut Katzgraber


Morten Eskildsen, University of Notre Dame
Speaker: Morten Eskildsen, University of Notre Dame Title: Vortex Structure and Broken Time Reversal Symmetry in the B phase of UPt3. Abstract: With three different superconducting mixed (vortex) phases the heavy-fermion material UPt3 can be considered a paradigm for unconventional superconductivity. Despite more than three decades of study, a definitive understanding of the superconducting state in this material has remained elusive. The order parameter structure that is consistent with a number of experiments is an odd-parity, f-wave orbital state of E2u symmetry. Here the order parameter is chiral and breaks time reversal symmetry in the low-temperature superconducting B-phase. We have performed small-angle neutron scattering (SANS) studies of the vortex lattice (VL) in UPt3 in the B- and C-phases with H // c. This led to the discovery of a previously unknown field-induced VL rotation in the B-phase. Furthermore, the magnitude of the VL rotation show a subtle magnetic field history dependence; VLs prepared with the field parallel or anti-parallel with respect to initial direction with which one enters the B-phase are rotated by different amounts. This demonstrates an internal degree of freedom associated with the vortex cores, and provides direct evidence for broken time reversal symmetry in the B-phase of UPt3 in non-zero fields by a bulk measurement. We propose that this correspond to an order parameter chirality that is respectively in the same or opposite sense as the VL supercurrent circulation. This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Awards DE-FG02-10ER46783 (University of Notre Dame; neutron scattering) and DE-FG02-05ER46248 (Northwestern University; crystal growth and characterization). Host: Ar. Abanov

22 Sep 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Guillaume Gervais, McGill University
Speaker: Guillaume Gervais, McGill University Title: TBA Abstract: Host: Ar. Abanov

29 Sep 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Shinsei Ryu, University of Chicago
Speaker: Shinsei Ryu, University of Chicago Title: TBA Abstract: Host: Ar. Abanov

6 Oct 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Leonid Rokhinson, Purdue
Speaker: Leonid Rokhinson, Purdue Title: TBA Abstract: Host: Ar. Abanov

13 Oct 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Sarang Gopalakrishnan, CUNY, Staten Island,
Speaker: Sarang Gopalakrishnan, CUNY, Staten Island, Title: TBA Abstract: Host: Ar. Abanov

20 Oct 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Debanjan Chowdhury, MIT
Speaker: Debanjan Chowdhury, MIT Title: TBA Abstract: Host: Ar. Abanov

27 Oct 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Ania Bleszynski Jayich, UCSB
Speaker: Ania Bleszynski Jayich, UCSB Title: TBA Abstract: Host: Ar. Abanov

3 Nov 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Brian DeMarco, University of Illinois Urbana-Champaign
Speaker: Brian DeMarco, University of Illinois Urbana-Champaign Title: TBA Abstract: Host: Ar. Abanov

10 Nov 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Romain Vasseur, Berkeley
Speaker: Romain Vasseur, Berkeley Title: TBA Abstract: Host: Ar. Abanov

17 Nov 2017, 4:00PM | MIST M102
Hosted By: Ar. Abanov


THANKSGIVING
Speaker: THANKSGIVING Title: Abstract: Host:

24 Nov 2017, 4:00PM | MIST M102


Erez Berg, University of Chicago
Speaker: Erez Berg, University of Chicago Title: TBA Abstract: Host: Ar. Abanov

1 Dec 2017, 6:51PM | MIST M102
Hosted By: Ar. Abanov


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