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Evidence for superconductivity in Rb metal above 55 GPa pressure

Journal Article · · Physical Review. B
 [1];  [2]
  1. Washington Univ., St. Louis, MO (United States); DOE/OSTI
  2. Washington Univ., St. Louis, MO (United States)

Here, the only alkali metal known to be superconducting at ambient pressure is Li at 0.4 mK. Under 30 GPa pressure Tc for Li rises to 14 K. In addition, nearly 50 years ago the heavy alkali metal Cs was reported to become superconducting near 1.3 K at 12 GPa. In the present experiment the superconductivity of Cs under pressure is confirmed. In addition, strong evidence is presented in electrical resistivity measurements that neighboring Rb also becomes superconducting near 2 K at 55 GPa as it enters the oC16 phase, as for Cs, where Tc decreases under the application of pressure. It would seem likely that under the right temperature/pressure conditions all alkali metals, including metallic hydrogen, will join the ranks of the superconducting elements. With the addition of Rb, 55 of the 92 naturally occurring elements are superconducting at ambient or high pressure.

Research Organization:
Carnegie Inst. of Washington, Washington, DC (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation
Grant/Contract Number:
FC52-08NA28554
OSTI ID:
1614438
Alternate ID(s):
OSTI ID: 1546457
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 100; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (23)

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Pressure calibration of diamond anvil Raman gauge to 310GPa journal August 2006
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Phase stability of highly compressed cesium journal June 2000
Observation of the o P 8 crystal structure in potassium at high pressure journal July 2009
Magnetic ordering at anomalously high temperatures in Dy at extreme pressures journal January 2015
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Pressure-Induced Superconductivity in Cesium and Yttrium journal April 1970
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Complex Crystal Structure of Cesium-III journal November 2001
Structure of Rb-III: Novel Modulated Stacking Structures in Alkali Metals journal April 2002
Superconducting Phase Diagram of Li Metal in Nearly Hydrostatic Pressures up to 67 GPa journal October 2003
CHEMISTRY: Electrons as Anions journal August 2003
Pressure-induced Superconductivity in Elemental Materials journal May 2005

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