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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism

Background:

  • Quantum spin ice materials exhibit complex magnetic phenomena.
  • Yb2Ti2O7 is a candidate material for realizing quantum spin ice physics.

Purpose of the Study:

  • To compute the specific heat and entropy of Yb2Ti2O7 using experimentally determined parameters.
  • To validate Yb2Ti2O7 as a model quantum spin ice.
  • To understand the magnetic ordering and excitations in Yb2Ti2O7.

Main Methods:

  • Numerical linked-cluster expansions were employed to calculate thermodynamic properties.
  • Anisotropic exchange interactions derived from inelastic neutron scattering were used.
  • Comparison with experimental calorimetric data was performed.

Main Results:

  • Calculated specific heat and entropy show good agreement with experimental data for Yb2Ti2O7.
  • A ferrimagnetic ordered ground state was found in the weak quantum regime.
  • Two distinct peaks in specific heat were identified, corresponding to a paramagnetic to spin ice crossover and a first-order phase transition.

Conclusions:

  • Yb2Ti2O7 serves as a model system for quantum spin ice.
  • The observed thermodynamic features are linked to exotic quantum dynamics, including weakly confined spinon-antispinon pairs.
  • This behavior is anticipated in other quantum spin ice materials.