Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures.
By M. Somayazulu, M. Ahart, Ajay Kumar Mishra, Z. Geballe, M. Baldini, Y. Meng, V. Struzhkin, Russell J. Hemley. Physical Review Letters, 2018
860 citations recorded by the source corpus.
Recent predictions and experimental observations of high T_{c} superconductivity in hydrogen-rich materials at very high pressures are driving the search for superconductivity in the vicinity of room temperature. We have developed a novel preparation technique that is optimally suited for megabar pressure syntheses of superhydrides using modulated laser heating while maintaining the integrity of sample-probe contacts for electrical transport measurements to 200 GPa. We detail the synthesis and characterization of lanthanum superhydride samples, including four-probe electrical transport measurements that display significant drops in resistivity on cooling up to 260 K and 180-200 GPa, and resistivity transitions at both lower and higher temperatures in other experiments. Additional current-voltage measurements, critical current estimates, and low-temperature x-ray diffraction are also obtained. We suggest that the transitions represent signatures of superconductivity to near room temperature in phases of lanthanum superhydride, in good agreement with density functional structure search and BCS theory calculations.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Geophysics
View Paper: https://www.semanticscholar.org/paper/a101bba58b9c79d437c9e45d35a4ddd80f865b83
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Citations in the corpus
- A perspective on conventional high-temperature superconductors at high pressure: Methods and materials (2019, background): “It was definitely disproven at the turn of the 21st century by three important discoveries: I) superconductivity at 39 K in MgB2 [23], II) high-Tc superconductivity at 203 K in H3S [1], III) and near room-temperature superconductivity at 250 K in LaH10 [2, 3] – High-Tc cuprates, discovered in 1986 (”
- On Distribution of Superconductivity in Metal Hydrides (2018, background): “Looking at the highest-Tc superconductors, which are in the YH10-LaH10-AcH10 series, the electronic density of states at the Fermi level (N(EF)) is 10–12 states/Ry/cell, or 0.3–0.5 states/Ry/ Å3, or ~1 state/Ry/H-atom at 200–250 GPa.”