Electronic Properties of Fe²⁺ in Cubic KMgF₃ from Mössbauer Spectroscopy

Richard B. Frankel, Massachusetts Institute of Technology
J. Chappert, Centre d'Etudes Nucléaires de Grenoble, France
J. R. Regnard, Centre d'Etudes Nucléaires de Grenoble, France
A. Misetich, Massachusetts Institute of Technology
C. R. Abeledo, Brandeis University

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Copyright © 1972 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review B and may be found at http://dx.doi.org/10.1103/PhysRevB.5.2469.

NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.

Abstract

Iron-doped KMgF₃ single crystals have been studied by Mössbauer spectroscopy of Fe⁵⁷. Single lines due to Fe²⁺ and Fe³⁺ are observed at room temperature. For T<12 >K, the Fe²⁺ line splits into a quadrupole doublet with a splitting ΔE_Q=0.44±0.02 mm/sec. Comparison with a random-strain model due to Ham yields a value of 120 cm^-1 for the position of the first excited spin-orbit split level. Magnetic hyperfine structure in external magnetic fields at low temperature is observed and analysis yields a value of -495 ±30 kOe for the corepolarization hyperfine field in Fe²⁺ and a value of 4.1 a.u. for〈1/r³〉.