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DTSTART;TZID=Europe/Paris:20260427T140000
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CREATED:20260424T080436Z
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UID:10000127-1777298400-1777302000@sfp-alpes.fr
SUMMARY:Allen SCHEIE (ORNL\, USA)
DESCRIPTION:Quantum dynamics and emergent unconventional phase in Yb2Ti2O7\nRésumé : \nYb2Ti2O7 is a classic and well-studied pyrochlore magnet\, but it continues to hold surprises for science. In this talk I present inelastic neutron scattering showing the low-field evolution of the spectrum from diffuse continua to sharp excitations. I compare this to several theoretical models which capture its behavior to varying degrees\, but which fail in the zero-field phase–which our exact diagonalization calculations show to be an emergent quantum disordered phase between ferromagnetism and antiferromagnetism. Much of the behavior matches the phenomenology of quantum criticality: dimensional reduction\, flat bands collapsing to zero frequency\, and an emergent quantum phase on the boundary between competing phases. Thus although Yb2Ti2O7 is not a quantum spin ice\, it appears to be dominated by intrinsic\, emergent non-magnon fluctuations from an unconventional quantum phase. \n_ \nContact : andrew.fefferman@neel.cnrs.fr \n  \n 
URL:https://sfp-alpes.fr/event/allen-scheie-ornl-usa/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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