Evidence of a first-order phase transition to metallic hydrogen
Abstract
The insulator-metal transition in hydrogen is one of the most outstanding problems in condensed-matter physics. The high-pressure metallic phase is now predicted to be liquid atomic from the low-temperature limit with the system in the ground state to very high temperatures. We have conducted measurements of optical properties of hot dense hydrogen in the region of 1.1–1.7 Mbars and up to 2200 K. We present evidence supportive of a first-order phase transition accompanied by changes in transmittance and reflectance, characteristic of a metal. The phase line of this transition has a negative slope in agreement with theories of the so-called plasma phase transition.
- Authors:
-
- Harvard Univ., Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Harvard Univ., Cambridge, MA (United States); Univ. of Nevada, Las Vegas, NV (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
- OSTI Identifier:
- 1439436
- Alternate Identifier(s):
- OSTI ID: 1247828; OSTI ID: 1798847
- Grant/Contract Number:
- NA0001990; NA0001982; NA0003346
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 08 HYDROGEN; hydrogen; pressure; phase transition
Citation Formats
Zaghoo, Mohamed, Salamat, Ashkan, and Silvera, Isaac F. Evidence of a first-order phase transition to metallic hydrogen. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.93.155128.
Zaghoo, Mohamed, Salamat, Ashkan, & Silvera, Isaac F. Evidence of a first-order phase transition to metallic hydrogen. United States. https://doi.org/10.1103/PhysRevB.93.155128
Zaghoo, Mohamed, Salamat, Ashkan, and Silvera, Isaac F. Fri .
"Evidence of a first-order phase transition to metallic hydrogen". United States. https://doi.org/10.1103/PhysRevB.93.155128. https://www.osti.gov/servlets/purl/1439436.
@article{osti_1439436,
title = {Evidence of a first-order phase transition to metallic hydrogen},
author = {Zaghoo, Mohamed and Salamat, Ashkan and Silvera, Isaac F.},
abstractNote = {The insulator-metal transition in hydrogen is one of the most outstanding problems in condensed-matter physics. The high-pressure metallic phase is now predicted to be liquid atomic from the low-temperature limit with the system in the ground state to very high temperatures. We have conducted measurements of optical properties of hot dense hydrogen in the region of 1.1–1.7 Mbars and up to 2200 K. We present evidence supportive of a first-order phase transition accompanied by changes in transmittance and reflectance, characteristic of a metal. The phase line of this transition has a negative slope in agreement with theories of the so-called plasma phase transition.},
doi = {10.1103/PhysRevB.93.155128},
journal = {Physical Review. B},
number = 15,
volume = 93,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2016},
month = {Fri Apr 15 00:00:00 EDT 2016}
}
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Figures / Tables:
Fig. 1: Phase diagram showing several theoretical predictions of the plasma phase transition, as well as established phases in the solid at lower temperatures, and the theoretical melting line with confirming experimental data. Our pressure/temperature plateau data points (solid black triangles) delineate a phase boundary and optical measurements confirm themore »
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