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Metamagnetism in Eu3O4

L. Holmes*

M. Schieber†,‡

  • Division of Engineering and Applied Physics, Harvard University, Cambridge, Massachusetts

  • National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts

  • *Research supported by the Electronics Research Directorate of the U.S. Air Force Cambridge Research Laboratories under Contract AF19(628)-3874. Work performed in partial fulfillment of the requirements for the degree of Doctor of Philosophy from Harvard University. Present address: Bell Telephone Laboratories, Murray Hill, N.J.
  • Present address: Department of Physics, The Hebrew University of Jerusalem, Israel.
  • Supported by the U.S. Air Force Office of Scientific Research.

Phys. Rev. 167, 449 – Published 10 March, 1968

DOI: https://doi.org/10.1103/PhysRev.167.449

Abstract

The magnetic properties of the metamagnet Eu3O4 are analyzed using molecular-field theory. For the antiferromagnetic ground state, it is assumed that linear, ferromagnetic chains of spins (Eu2+) are polarized along the c axis of the orthorhombic unit cell, with neighboring chains antiparallel. The weakly magnetic ions Eu3+ provide an apparently inert magnetic background. Exchange constants are deduced from the paramagnetic Curie temperature θp=5°K and the critical field Hc=2.4 kOe. The constants for first- and second-neighbor Eu2+ interactions are J1k0.3°K and J2k0.02°K, respectively. An anisotropy field of 7 kOe is derived from the transverse magnetic susceptibility at low temperatures. This value is also obtained from a magnetic dipolar sum. Theoretical estimates of the ordering temperature give Tc5°K, as observed.

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