Non-Fermi-Liquid Behavior of Superconducting SnH4

Ivan A Troyan; Dmitrii V Semenok; Anna G Ivanova; Andrey V Sadakov; Di Zhou; Alexander G Kvashnin; Ivan A Kruglov; Oleg A Sobolevskiy; Marianna V Lyubutina; Dmitry S Perekalin; Toni Helm; Stanley W Tozer; Maxim Bykov; Alexander F Goncharov; Vladimir M Pudalov; Igor S Lyubutin

doi:10.1002/advs.202303622

Non-Fermi-Liquid Behavior of Superconducting SnH₄

Adv Sci (Weinh). 2023 Oct;10(30):e2303622. doi: 10.1002/advs.202303622. Epub 2023 Aug 25.

Authors

Ivan A Troyan¹, Dmitrii V Semenok², Anna G Ivanova¹, Andrey V Sadakov³, Di Zhou², Alexander G Kvashnin⁴, Ivan A Kruglov^{5

6}, Oleg A Sobolevskiy³, Marianna V Lyubutina¹, Dmitry S Perekalin⁷, Toni Helm⁸, Stanley W Tozer⁹, Maxim Bykov¹⁰, Alexander F Goncharov¹¹, Vladimir M Pudalov^{3

12}, Igor S Lyubutin¹

Affiliations

¹ Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninsky Prospekt, Moscow, 119333, Russia.
² Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing, 100193, China.
³ V. L. Ginzburg Center for High-Temperature Superconductivity and Quantum Materials P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia.
⁴ Skolkovo Institute of Science and Technology, Bolshoy Boulevard, 30/1, Moscow, 121205, Russia.
⁵ Center for Fundamental and Applied Research, Dukhov Research Institute of Automatics (VNIIA), st. Sushchevskaya, 22, Moscow, 127055, Russia.
⁶ Laboratory of Computational Materials Discovery, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny, 141700, Russia.
⁷ A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119334, Russia.
⁸ Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328, Dresden, Germany.
⁹ National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32310, USA.
¹⁰ Institute of Inorganic Chemistry, University of Cologne, 50939, Cologne, Germany.
¹¹ Earth and Planets Laboratory, Carnegie Institution for Science, 5241 Broad Branch Road NW, Washington, DC, 20015, USA.
¹² HSE Tikhonov Moscow Institute of Electronics and Mathematics National Research University Higher School of Economics, 20 Myasnitskaya ulitsa, Moscow, 101000, Russia.

Abstract

The chemical interaction of Sn with H₂ by X-ray diffraction methods at pressures of 180-210 GPa is studied. A previously unknown tetrahydride SnH₄ with a cubic structure (fcc) exhibiting superconducting properties below T_C = 72 K is obtained; the formation of a high molecular C2/m-SnH₁₄ superhydride and several lower hydrides, fcc SnH₂ , and C2-Sn₁₂ H₁₈ , is also detected. The temperature dependence of critical current density J_C (T) in SnH₄ yields the superconducting gap 2Δ(0) = 21.6 meV at 180 GPa. SnH₄ has unusual behavior in strong magnetic fields: B,T-linear dependences of magnetoresistance and the upper critical magnetic field B_C2 (T) ∝ (T_C - T). The latter contradicts the Wertheimer-Helfand-Hohenberg model developed for conventional superconductors. Along with this, the temperature dependence of electrical resistance of fcc SnH₄ in non-superconducting state exhibits a deviation from what is expected for phonon-mediated scattering described by the Bloch-Grüneisen model and is beyond the framework of the Fermi liquid theory. Such anomalies occur for many superhydrides, making them much closer to cuprates than previously believed.

Keywords: high pressure; non-Fermi-liquid; superconductivity; tin hydrides.

Abstract

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