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Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Journal Article · · Science (Washington, D.C.)
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [4];  [2];  [5];  [6];  [5];  [7];  [1]
  1. EPFL, Lausanne, Switzerland
  2. Helmholtz-Zentrum Berlin
  3. University of Chicago
  4. University College, London
  5. Laboratory for Neutron Scattering ETHZ & PSI
  6. Laboratory for Neutron Scattering, PSI
  7. University of Bern
+ Show Author Affiliations
Magnetism has been predicted to occur in systems in which dipolar interactions dominate exchange. We present neutron scattering, specific heat, and magnetic susceptibility data for LiErF{sub 4}, establishing it as a model dipolar-coupled antiferromagnet with planar spin-anisotropy and a quantum phase transition in applied field H{sub c{parallel}} = 4.0 {+-} 0.1 kilo-oersteds. We discovered non-mean-field critical scaling for the classical phase transition at the antiferromagnetic transition temperature that is consistent with the two-dimensional XY/h{sub 4} universality class; in accord with this, the quantum phase transition at H{sub c} exhibits three-dimensional classical behavior. The effective dimensional reduction may be a consequence of the intrinsic frustrated nature of the dipolar interaction, which strengthens the role of fluctuations.
Research Organization:
Oak Ridge National Laboratory (ORNL)
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1043320
Journal Information:
Science (Washington, D.C.), Journal Name: Science (Washington, D.C.) Journal Issue: 6087 Vol. 336; ISSN SCIEAS; ISSN 0036-8075
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CRITICALITY
DIPOLES
FLUCTUATIONS
LITHIUM
MAGNETIC SUSCEPTIBILITY
MAGNETISM
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
SCATTERING
SPECIFIC HEAT
TEMPERATURE DEPENDENCE