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DTSTART:20190331T030000
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DTSTAMP:20260406T074244Z
UID:5c2f863d3aaea518128349@ist.ac.at
DTSTART:20190129T100000
DTEND:20190129T110000
DESCRIPTION:Speaker: Kimberly Modic\nhosted by Zhanybek Alpichshev\nAbstrac
 t: Quantum spin liquids are a new state of matter in which electron spins 
 become strongly entangled and maintain a fluid-like state down to low temp
 eratures. In the search for quantum spin liquids\, hopes of realizing the 
 Kitaev model have directed a surge of interest towards 2D and 3D honeycomb
  networks of effective spin 1/2 moments. It has already been shown that th
 e edge-shared octahedra surrounding the magnetic ions mediate at least som
 e degree of theprerequisite exchange interactions. While a unique spin-ani
 sotropy in the exchange interactions leads to enhanced magnetic frustratio
 n\, all candidate materials orderantiferromagnetically at low temperatures
 . Nevertheless\, experimental efforts gainedmomentum when a continuum of e
 xcitations was identified in RuCl3 by way of neutron scattering and Raman 
 spectroscopy. This feature\, characteristic of a spin liquid\, persists ou
 tside of the ordered state up to a temperature scale that is of order the 
 exchange interaction energy scale (J ~ 150 K). We use a newly-developed pr
 obe of magnetic anisotropy  resonant torsion magnetometry  to explore the 
 competition between the intrinsic energy scales of the exchange interactio
 ns in RuCl3 and the external parameters of temperature and magnetic field.
  Performing measurements up to 65 T\, we introduce a Zeeman energy that is
  comparable to the largest exchange interactions in the system. Over the e
 ntire temperature-field phase diagram\, we observe a robust and peculiar a
 ngle dependence of the magnetic anisotropy that rules out conventional par
 amagnetism\, even at the largest available magnetic fields. While this beh
 avior attests to the presence of a large\, underlying J in RuCl3\, we find
  that the measured magnetic anisotropy is entirely controlled by the therm
 al and magnetic energy scales. Such a scaleinvariant response indicates th
 at the effective exchange interaction energy scale has been driven to zero
  by strong correlations present in the high-field spin liquid state.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:tguggenb@ist.ac.at
SUMMARY:Kimberly Modic: Scale-invariance in quantum spin liquids
URL:https://talks-calendar.ista.ac.at/events/1735
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