Pressure-induced reentrant metallic phase in lithium

T. Matsuoka, M. Sakata, Y. Nakamoto, K. Takahama, K. Ichimaru, K. Mukai, K. Ohta, N. Hirao, Y. Ohishi, and K. Shimizu
Phys. Rev. B 89, 144103 – Published 8 April 2014

Abstract

We report the metal (0–80 GPa)–semiconductor (oC40, 80–120 GPa)–metal (oC24, >120 GPa) transitions of lithium under compression, as observed through simultaneous electrical resistance and x-ray diffraction measurements. The energy gap in the oC40 semiconductor quickly decreases with applied pressure, and Li reverts back to a metallic state accompanied by a structural transition to oC24. The large ρ value for oC24 indicates that this re-entrant metallic phase is a so-called “poor metal.” Our results reveal a characteristic phase diagram that demonstrates the existence of a semiconductor phase between two distinct metallic phases.

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  • Received 26 December 2012
  • Revised 19 March 2014

DOI:https://doi.org/10.1103/PhysRevB.89.144103

©2014 American Physical Society

Authors & Affiliations

T. Matsuoka1,*, M. Sakata1, Y. Nakamoto1, K. Takahama1, K. Ichimaru1, K. Mukai1, K. Ohta1, N. Hirao2, Y. Ohishi2, and K. Shimizu1

  • 1Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Osaka 560-8531, Japan
  • 2Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, Hyogo 679-5198, Japan

  • *Present address: Department of Electrical, Electronic and Computer Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.

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Vol. 89, Iss. 14 — 1 April 2014

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