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|September 11, 2020
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Measurements on the Kitaev material candidate α-RuCl3 question a phase transition between quantum spin liquid and field-polarized states. A subtle anomaly in the magnetic Grüneisen parameter (ΓB) suggests proximity to a new phase without transition.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • The Kitaev material candidate, α-RuCl3, is studied for its potential quantum spin liquid (QSL) behavior.
  • Understanding the phase transitions in α-RuCl3 is crucial for exploring exotic quantum phenomena.

Purpose of the Study:

  • To investigate the entropy and magnetic Grüneisen parameter (ΓB) in α-RuCl3 under in-plane magnetic fields.
  • To determine if a phase transition exists between the QSL and field-polarized states.

Main Methods:

  • Measurements of specific heat and magnetic Grüneisen parameter (ΓB) as a function of temperature (down to 1 K) and magnetic field (up to 12 T).
  • Theoretical analysis using exact diagonalization of extended Kitaev models.

Main Results:

  • No clear phase transition signatures were observed beyond the magnetically ordered region.
  • A subtle shoulderlike anomaly in ΓB was detected, corresponding to a minimal entropy change.
  • Theoretical calculations reproduced this anomaly, attributing it to proximity to an additional phase.

Conclusions:

  • The observed anomaly challenges the existence of a distinct phase transition between the QSL and field-polarized states in α-RuCl3.
  • The magnetic Grüneisen parameter (ΓB) is sensitive to excitation crossings in gapped phases.
  • The findings suggest proximity to a new phase rather than a direct transition.