Grainger College of Engineering Seminars & Speakers

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Condensed Matter Seminar - "Feeling the strain: longitudinal and transverse fields for electric quadrupole order"

Event Type
Seminar/Symposium
Sponsor
Physics - Condensed Matter
Location
ESB 190
Date
Nov 15, 2024   1:00 pm  
Speaker
Ian Fisher, Stanford University
Contact
Stephen Bullwinkel
E-Mail
bullwink@illinois.edu
Phone
217-333-1652
Views
97
Originating Calendar
Physics - Condensed Matter Seminar

Ferroquadrupole order, in which local atomic sites develop identically-oriented spontaneous electric quadrupole moments, provides a specific realization of electronic nematic order. Materials that harbor quadrupolar order can provide useful insights to open questions about the roles played by nematic fluctuations in a wide range of strongly correlated quantum materials. Here I will describe effects associated with longitudinal and transverse effective fields on the quadrupolar material TmVO4, paying attention to the special roles played by externally-induced strain, as well as hyperfine coupling. I will also emphasize several aspects of technique development, including new methods to probe the elastocaloric effect in the frequency domain and in the time domain. These measurements reveal a giant elastocaloric effect at low temperatures, with interesting technological consequences. Electronic nematic order, it would seem, can be useful as well as interesting.

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