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Dimensional Reduction in Quantum Dipolar Antiferromagnets.

P Babkevich1, M Jeong1, Y Matsumoto2

  • 1Laboratory for Quantum Magnetism, Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Physical Review Letters
|May 28, 2016
PubMed
Summary
This summary is machine-generated.

Researchers studied the magnetic properties of LiYbF4, finding critical exponents that align with 2D XY universality. This suggests dimensional reduction is a universal feature in quantum dipolar antiferromagnets.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism

Background:

  • Antiferromagnetic materials exhibit complex magnetic ordering.
  • Understanding critical exponents provides insight into universality classes of phase transitions.

Purpose of the Study:

  • To investigate the critical behavior of the dipolar-coupled antiferromagnet LiYbF4.
  • To determine the universality class of its thermal and quantum phase transitions.

Main Methods:

  • Ac susceptibility measurements
  • Specific heat measurements
  • Neutron scattering experiments

Main Results:

  • Thermal transition order-parameter critical exponent found to be 0.20(1).
  • Specific-heat critical exponent found to be -0.25(1), matching the 2D XY universality class.
  • Quantum phase transition order-parameter exponent determined to be 0.35(1), corresponding to (2+1)D.

Conclusions:

  • The critical exponents of LiYbF4 are consistent with the 2D XY universality class, despite its structure.
  • Dimensional reduction is experimentally established as a universal characteristic of quantum dipolar antiferromagnets on a distorted diamond lattice.