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

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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.

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Authors and Affiliations

  1. School of Physics and Astronomy, Tel Aviv University, 69978, Tel Aviv, Israel

    Moshe P. Pasternak

  2. MST-10, MS-K764, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Moshe P. Pasternak & R. Dean Taylor

Authors
  1. Moshe P. Pasternak
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  2. R. Dean Taylor
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Pasternak, M.P., Taylor, R.D. High-pressure Mössbauer spectroscopy, a unique tool for unraveling the nature of electron correlations in Mott insulators. Hyperfine Interactions 128, 81–100 (2000). https://doi.org/10.1023/A:1012671229494

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