Thursday, Feb 22nd: Nuclear Magnetic Resonance in Condensed Matter Physics: Unconventional Superconductivity, Quantum Magnetism, and Other Magnificent Tales

Event Date: 

Thursday, February 22, 2018 - 5:15pm

Event Date Details: 

Pizza will be served at the conclusion of the seminar.

Event Location: 

  • Broida 3302
  • Special Physics Seminar

"More is Different". The title of Phillip Anderson's 1972 seminal paper epitomizes our modern perception of condensed matter, and, to a great extent, prophesied the wealth of new physics and emergent phenomena that have unfolded in the field the past 40 years. With the number of novel materials ever growing, research efforts aim to further our understanding of their electronic and magnetic properties, as well as to devise technological applications. Nuclear magnetic resonance (NMR) has constituted an invaluable tool in this quest, providing a local microscopic probe, sensitive to both charge and spin degrees of freedom.

In this talk, I will present an overview of the NMR technique and its application in solid-state physics. Recent NMR work in two major areas of strongly correlated electron physics, heavy-fermions and quantum magnetism, will serve as an example. In particular, firstly, the concept of unconventional superconductivity in heavy-fermion materials will be introduced and the NMR investigation of the PuMX5 (M=Co, Rh, X=In, Ga) family will be presented. The specific goal is to elucidate the pairing mechanism of the superconducting condensate in these materials. Secondly, the notion of geometric frustration and its effects in quantum magnets will be discussed, as manifested in the triangular-lattice antiferromagnet Ba3CoSb2O9.

Georgios Koutroulakis, UCSB