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It was predicted that solid metallic hydrogen can be obtained if solidmolecular hydrogen is pressured to high pressure at low temperature about 80years ago. Furthermore, the solid metallic hydrogen was theoretically predictedto show superconductivity at room temperature. In addition, surprisingprediction was made that the solid metallic hydrogen is a metastable metal witha potential barrier of 1 eV. This prediction implies that the solid metallichydrogen remains in the metallic solid phase state even after it is releasedfrom high pressure. Shock compression synthesized liquid metallic hydrogen sofar. However, to obtain metallic hydrogen under ambient pressure at roomtemperature, it is necessary to synthesize solid metallic hydrogen. It istheoretically predicted that an ultrahigh pressure of ~500 GPa is required toproduce solid metallic hydrogen. This pressure is close to the limit of thehigh pressure that can be generated by the diamond anvil cell (DAC). Therefore,it is difficult to synthesize metallic hydrogen by using DAC. Shock compressionmethods can generate a sufficiently high pressure to synthesize metallichydrogen. But it is impossible to synthesize solid metallic hydrogen by thesemethods because these accompany generation of high temperature. There iscurrently no definitive way to synthesize solid metallic hydrogen.  Here we report a new dynamic high-pressure apparatus which aims for synthesisof solid metallic hydrogen. We show that by using this apparatus, it ispossible to generate a high pressure of 1 TPa, the pressure maintaining time is103 to 106 times longer than the conventional dynamic compression method.Furthermore, we show that this apparatus is not accompanied by the generationof high temperature unlike the conventional dynamic compression method and thenit is possible that solid metallic hydrogen might be synthesized by thisapparatus.

High-temperature and high-pressure apparatus aiming for synthesis of solid metallic hydrogen