High-pressure Mössbauer spectroscopy, a unique tool for unraveling the nature of electron correlations in Mott insulators

Moshe P. Pasternak, R. Dean Taylor

Research output: Contribution to journalArticlepeer-review

Abstract

Combining the methods of Mössbauer spectroscopy, synchrotron XRD, and resistivity and using diamond-anvil cells enables the discovery and studies of new phenomena in magnetism and electronic correlation at high density. It is shown that Hund's rule concerning the high-spin state in TM-compounds does not hold in this regime resulting in spin-crossover and collapse of the magnetic state for even-valence TM ions and for the decline of magnetic exchange in the odd-valence species. This mechanism competes with the breakdown of the d-d electron correlation (Mott transition) in transforming the Mott insulators into normal metals. The experimental issues are described and examples of magnetic studies at very high-pressures are portrayed.

Original languageEnglish
Pages (from-to)81-100
Number of pages20
JournalHyperfine Interactions
Volume128
Issue number1-3
DOIs
StatePublished - 2000

Keywords

  • High-pressure
  • Magnetism
  • Mott insulators
  • Mössbauer spectroscopy
  • Spin crossover

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