Singlet condensation on an antiferromagnetic background in CaMn2Sb2

Note: Pizza served at 11:45 AM
Speaker: Verner Thorsmolle, Rutgers University

When: January 25, 2013 (Fri), 12:00PM to 01:00PM (add to my calendar)
Location: SCI 352
Hosted by: Richard Averitt

This event is part of the Biophysics/Condensed Matter Seminar Series.

Abstract: I will present recent transport and spectroscopic Raman studies, supported by DFT-DMFT computations, of CaMn2Sb2 which presents a narrow gap insulator harboring a weak ferromagnetic phase below 200 K and an antiferromagnetic (AF) phase below 85 K. Upon approaching the AF phase Raman spectroscopy shows a broad continuum below 50 meV emerging into a coherent 32 meV excitation which also governs Arrhenius type conductivity. The low-temperature behavior is interpreted in terms of singlet pairing above the computed AF order where the emergent feature is due to singlet pair breaking excitations into quasiparticles.