P. P. Kong

Max Planck Institute for Chemistry

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M. I. Eremets

Max Planck Institute for Chemistry

Vasily S. Minkov

Max Planck Institute for Chemistry

АП

А. П. Дроздов

Max Planck Institute for Chemistry

Changqing Jin

Chinese Academy of Sciences

Mikhail A. Kuzovnikov

University of Edinburgh

D. A. Knyazev

Max Planck Institute of Microstructure Physics

S. P. Besedin

Burdenko Neurosurgery Institute

Fedor Balakirev

Los Alamos National Laboratory

Wenge Yang

Center for High Pressure Science and Technology Advanced Research

Guoyin Shen

Argonne National Laboratory

Cooperative Institutions

Chinese Academy of Sciences

Institute of Physics

University of Chinese Academy of Sciences

Czech Academy of Sciences, Institute of Physics

National Laboratory for Superconductivity

Songshan Lake Materials Laboratory

The University of Texas at Austin

Max Planck Institute for Chemistry

Center for High Pressure Science and Technology Advanced Research

Max Planck Society

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Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Scientific Reports (2014)

P. P. Kong Fei Sun Lei Xing Jun Zhu Sijie Zhang

Recently, A2B3 type strong spin orbital coupling compounds such as Bi2Te3, Bi2Se3 and Sb2Te3 were theoretically predicated to be topological insulators and demonstrated through experimental efforts. The counterpart compound Sb2Se3 on the other hand was found to be topological trivial, but further theoretical studies indicated that the pressure might induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity in Sb2Se3 single crystal induced via pressure. Our experiments indicated that Sb2Se3 became superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition at ~3 GPa which should be related to the topological quantum transition. The superconducting transition temperature (TC) increased to around 8.0 K with pressure up to 40 GPa while it keeps ambient structure. High pressure Raman revealed that new modes appeared around 10 GPa and 20 GPa, respectively, which correspond to occurrence of superconductivity and to the change of TC slop as the function of high pressure in conjunction with the evolutions of structural parameters at high pressures.

Topological insulator

Ambient pressure

Superconducting transition temperature

10.1038/srep06679

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Citations (67)

Superconductivity up to 243 K in yttrium hydrides under high pressure

arXiv (Cornell University) (2019)

P. P. Kong Vasily S. Minkov Mikhail A. Kuzovnikov S. P. Besedin A. P. Drozdov

The discovery of high-temperature conventional superconductivity in H3S with a critical temperature of Tc=203 K was followed by the recent record of Tc ~250 K in the face-centered cubic (fcc) lanthanum hydride LaH10 compound. It was realized in a new class of hydrogen-dominated compounds having a clathrate-like crystal structure in which hydrogen atoms form a 3D framework and surround a host atom of rare earth elements. Yttrium hydrides are predicted to have even higher Tc exceeding room temperature. In this paper, we synthesized and refined the crystal structure of new hydrides: YH4, YH6, and YH9 at pressures up to 237 GPa finding that YH4 crystalizes in the I4/mmm lattice, YH6 in Im-3m lattice and YH9 in P63/mmc lattice in excellent agreement with the calculations. The observed very high-temperature superconductivity is comparable to that found in fcc-LaH10: the pressure dependence of Tc for YH9 also displays a "dome like shape" with the highest Tc of 243 K at 201 GPa. We also observed a Tc of 227 K at 237 GPa for the YH6 phase. However, the measured Tcs are notably lower by ~30 K than predicted. Evidence for superconductivity includes the observation of zero electrical resistance, a decrease of Tc under an external magnetic field and an isotope effect. The theoretically predicted fcc YH10 with the promising highest Tc>300 K was not stabilized in our experiments under pressures up to 237 GPa.

Lanthanum

Room-temperature superconductor

Lattice constant

Lattice (music)

10.48550/arxiv.1909.10482

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Citations (84)

Superconductivity at 250 K in lanthanum hydride under high pressures

Nature (2019)

А. П. Дроздов P. P. Kong Vasily S. Minkov S. P. Besedin Mikhail A. Kuzovnikov

Room-temperature superconductor

Critical field

Ambient pressure

Lanthanum

BCS theory

10.1038/s41586-019-1201-8

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Citations (602)

Semimetallic molecular hydrogen at pressure above 350 GPa

arXiv (Cornell University) (2017)

M. I. Eremets А. П. Дроздов P. P. Kong H. Wang

According to the theoretical predictions, insulating molecular hydrogen dissociates and transforms to an atomic metal at pressures P~370-500 GPa. In another scenario, the metallization first occurs in the 250-500 GPa pressure range in molecular hydrogen through overlapping of electronic bands. The calculations are not accurate enough to predict which option is realized. Here we show that at a pressure of ~360 GPa and temperatures <200 K the hydrogen starts to conduct, and that temperature dependence of the electrical conductivity is typical of a semimetal. The conductivity, measured up to 440 GPa, increases strongly with pressure. Raman spectra, measured up to 480 GPa, indicate that hydrogen remains a molecular solid at pressures up to 440 GPa, while at higher pressures the Raman signal vanishes, likely indicating further transformation to a good molecular metal or to an atomic state.

Hydrogen molecule

10.48550/arxiv.1708.05217

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Citations (5)

Superconductivity at 215 K in lanthanum hydride at high pressures

arXiv (Cornell University) (2018)

A. P. Drozdov Vasily S. Minkov S. P. Besedin P. P. Kong Mikhail A. Kuzovnikov

We synthesized lanthanum hydride (LaHx) by laser heating of lanthanum in hydrogen atmosphere at pressure P = 170 GPa. The sample shows a superconducting step at 209 K and 170 GPa and temperature dependence of resistance. By releasing the pressure to 150 GPa, the superconducting transition temperature Tc increases to 215 K - the record Tc. This finding supports a way of achieving Tc higher than the one in H3S (203 K) in hydrides with sodalite-like structures, first proposed for CaH6 (Tc=245 K) and later for yttrium and lanthanum hydrides where higher, room temperature superconductivity is expected.

Lanthanum

Sodalite

Superconducting transition temperature

10.48550/arxiv.1808.07039

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Citations (37)

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Nature Communications (2021)

P. P. Kong Vasily S. Minkov Mikhail A. Kuzovnikov А. П. Дроздов S. P. Besedin

The discovery of superconducting H

10.1038/s41467-021-25372-2

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Citations (342)

Universal diamond edge Raman scale to 0.5 terapascal and implications for the metallization of hydrogen

Nature Communications (2023)

M. I. Eremets Vasily S. Minkov P. P. Kong А. П. Дроздов Stella Chariton

The recent progress in generating static pressures up to terapascal values opens opportunities for studying novel materials with unusual properties, such as metallization of hydrogen and high-temperature superconductivity. However, an evaluation of pressure above ~0.3 terapascal is a challenge. We report a universal high-pressure scale up to ~0.5 terapascal, which is based on the shift of the Raman edge of stressed diamond anvils correlated with the equation of state of Au and does not require an additional pressure sensor. According to the new scale, the pressure values are substantially lower by 20% at ~0.5 terapascal compared to the extrapolation of the existing scales. We compare the available data of H2 at the highest static pressures. We show that the onset of the proposed metallization of molecular hydrogen reported by different groups is consistent when corrected with the new scale and can be compared with various theoretical predictions.

Diamond anvil cell

Hydrogen molecule

10.1038/s41467-023-36429-9

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Citations (15)

Superconductivity in Topological Insulator Sb2Te3 Induced by Pressure

Scientific Reports (2013)

Jinlong Zhu J. L. Zhang P. P. Kong Sijie Zhang Xiaohui Yu

Topological superconductivity is one of most fascinating properties of topological quantum matters that was theoretically proposed and can support Majorana Fermions at the edge state. Superconductivity was previously realized in a Cu-intercalated Bi2Se3 topological compound or a Bi2Te3 topological compound at high pressure. Here we report the discovery of superconductivity in the topological compound Sb2Te3 when pressure was applied. The crystal structure analysis results reveal that superconductivity at a low-pressure range occurs at the ambient phase. The Hall coefficient measurements indicate the change of p-type carriers at a low-pressure range within the ambient phase, into n-type at higher pressures, showing intimate relation to superconducting transition temperature. The first principle calculations based on experimental measurements of the crystal lattice show that Sb2Te3 retains its Dirac surface states within the low-pressure ambient phase where superconductivity was observed, which indicates a strong relationship between superconductivity and topology nature.

Topological insulator

Ambient pressure

Lattice (music)

10.1038/srep02016

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Citations (148)

The characterization of superconductivity under high pressure

Nature Materials (2024)

M. I. Eremets Vasily S. Minkov А. П. Дроздов P. P. Kong

Characterization

10.1038/s41563-023-01769-w

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