Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M29: Strongly Correlated Systems, Including Quantum Fluids and Solids IX
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 221
Sponsoring
Unit:
DCMP
Chair: Wonhee Ko, University of Tennessee, Knoxville
Abstract: M29.00009 : Observation of a Critical Charge Mode in a Strange Metal
9:36 AM–9:48 AM
Presenter:
Yashar Komijani
(University Of Cincinnati)
Authors:
Yashar Komijani
(University Of Cincinnati)
Hisao Kobayashi
(University of Hyogo, Japan)
Satoru Nakatsuji
(Univ of Tokyo-Kashiwanoha)
Premala Chandra
(Rutgers University)
Piers Coleman
(Rutgers University)
Understanding the strange metallic behavior which develops at the brink of localization demands new probes of the underlying electronic charge dynamics.
Using a state-of-the-art technique, synchrotron-radiation-based Mossbauer spectroscopy, we have studied the longitudinal charge fluctuations of the strange metal phase of β-YbAlB4 as a function of temperature and pressure. We find that the usual single absorption peak in the Fermi-liquid regime splits into two peaks upon entering the critical regime. This spectrum is naturally interpreted as a single nuclear transition, modulated by nearby electronic valence fluctuations whose long time-scales are further enhanced, due to the formation of charged polarons. Our results represent a direct observation of critical charge fluctuations as a new signature of strange metals.
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