Fragile quantum criticality and T/B-scaling in beta-YbAlB4: a theorist's perspectiv

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Date/Time:Thursday, 18 Nov 2010 - Thursday, 18 Nov 2010
Location:PHYSICS ROOM 5
Phone:515-294-2964
Channel:Condensed Matter Physics
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Prof. Andriy Nevidomskyy, Rice University

Emergent phenomena in quantum materials are subject of intense research
at present. A wonderful example of real material complexity are the
recently synthesized sister-phases of YbAlB4 - a newly discovered heavy
fermion material. While one phase (alpha) is a heavy Fermi liquid, its
sibling beta-phase is quantum critical, supporting perhaps the world's
most delicate unconventional superconductivity, with a tiny transition
temperature ~80 mK. Latest experiments uncover the T/B-scaling in the
beta-YbAlB4 and prove that superconductivity emerges from a strange
metal governed by an extremely fragile quantum criticality. I will
present the theorist's perspective, concentrating on the (T/B) scaling
and its consequences for understanding the apparently intrinsic quantum
criticality without tuning in this material.