Unusual Phase Transition Behavior in Weakly Interacting Magnetic Cluster Substances: Application to Magnetic Cooling.

Abstract

The statistical mechanics of a variety of magnetic cluster substances is discussed, with particular reference to the effects of weak inter-cluster interactions. It is shown that in the case of clusters with an energy gap between the singlet ground state and the excited states an unusual high-field transition may occur. The uses of cluster materials of this and related types in antiferromagnetic cooling by adiabatic magnetization are noted. A novel and more powerful method of cooling by adiabatic demagnetization of antiferromagnets is presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 16, 1973
Accession Number
AD0764620

Entities

People

  • Jill C. Bonner
  • Simeon A. Friedberg

Organizations

  • Carnegie Mellon University

Tags

DTIC Thesaurus Topics

  • Demagnetization
  • Energy Gaps
  • Energy Levels
  • Ground State
  • Magnetization
  • Materials
  • Mechanics
  • Phase Transformations
  • Physics
  • Statistical Mechanics
  • Transitions

Fields of Study

  • Physics

Readers

  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Superconducting Magnet Technology
  • Theoretical Analysis.