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Type: Artigo de periódico
Title: Electronic And Structural Ground State Of Heavy Alkali Metals At High Pressure
Author: Fabbris G.
Lim J.
Veiga L.S.I.
Haskel D.
Schilling J.S.
Abstract: Alkali metals display unexpected properties at high pressure, including emergence of low-symmetry crystal structures, which appear to occur due to enhanced electronic correlations among the otherwise nearly free conduction electrons. We investigate the high-pressure electronic and structural ground state of K, Rb, and Cs using x-ray absorption spectroscopy and x-ray diffraction measurements together with abinitio theoretical calculations. The sequence of phase transitions under pressure observed at low temperature is similar in all three heavy alkalis except for the absence of the oC84 phase in Cs. Both the experimental and theoretical results point to pressure-enhanced localization of the valence electrons characterized by pseudogap formation near the Fermi level and strong spd hybridization. Although the crystal structures predicted to host magnetic order in K are not observed, the localization process appears to drive these alkalis closer to a strongly correlated electron state.
Editor: American Physical Society
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.91.085111
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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