Clathrate Superhydrides Under High Pressure: A Class of Extraordinarily Hot Conventional Superconductors
Invited
Abstract
Room-T superconductivity has been a century long-held dream of mankind and a focus of intensive research. In an effort to search for Room-T superconductors, we proposed the first-ever sodalite-like clathrate superhydride CaH6 1 suffering at extreme pressures that shows a potential of high superconductivity and is not captured at ambient pressure.
We recently found a general phenomenon on the common formation of clathrate structures at high pressure in rare earth (RE) superhydrides having three stoichiometries of REH6, REH9, and REH10, some of which exhibit high-T superconductivity2. Subsequent experiments synthesized the predicted clathrate YH6, YH9, and LaH10 with the measured Tc values at 224, 243, and 260 K, respectively, setting up Tc records among known superconductors. These discoveries open up the door of achieving Room-T superconductors.
In the talk, I will give an overview on the current status of research progress on superconductive hydrides, and then discuss the design principle for achieving Room-T superhydrides. As an example, our recent prediction on clathrate superhydride in Li-Mg-H ternary system3 with a predicted Tc at ~400 K will be discussed.
1Wang, et al., PNAS 109, 6463 (2012)
2Peng, et al., PRL 119, 107001 (2017)
3Sun, et al., PRL 123, 097001 (2019)
We recently found a general phenomenon on the common formation of clathrate structures at high pressure in rare earth (RE) superhydrides having three stoichiometries of REH6, REH9, and REH10, some of which exhibit high-T superconductivity2. Subsequent experiments synthesized the predicted clathrate YH6, YH9, and LaH10 with the measured Tc values at 224, 243, and 260 K, respectively, setting up Tc records among known superconductors. These discoveries open up the door of achieving Room-T superconductors.
In the talk, I will give an overview on the current status of research progress on superconductive hydrides, and then discuss the design principle for achieving Room-T superhydrides. As an example, our recent prediction on clathrate superhydride in Li-Mg-H ternary system3 with a predicted Tc at ~400 K will be discussed.
1Wang, et al., PNAS 109, 6463 (2012)
2Peng, et al., PRL 119, 107001 (2017)
3Sun, et al., PRL 123, 097001 (2019)
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Presenters
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Yanming Ma
State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Jilin Univ
Authors
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Yanming Ma
State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Jilin Univ