Non-Fermi-Liquid Behavior of Superconducting SnH${}_4$

Abstract

We studied chemical interaction of Sn with H${}_2$ by X-ray diffraction methods at pressures of 180-210 GPa. A previously unknown tetrahydride SnH${}_4$ with a cubic structure ($fcc$) exhibiting superconducting properties below $T$${}_C$ = 72 K was obtained; the formation of a high molecular $C2/m$-SnH${}_{14}$ superhydride and several lower hydrides, $fcc$ SnH${}_2$ and $C2$-Sn${}_{12}$H${}_{18}$, was also detected. The temperature dependence of critical current density $J$${}_C$(T) in SnH${}_4$ yields the superconducting gap 2$\Delta$(0) = 23 meV at 180 GPa. SnH${}_4$ has unusual behavior in strong magnetic fields: $B,T$-linear dependences of magnetoresistance and the upper critical magnetic field $B$${}_{C2}$(T) $\propto$ ($T$${}_C$ - $T$). The latter contradicts the Wertheimer-Helfand-Hohenberg model developed for conventional superconductors. Along with this, the temperature dependence of electrical resistance of $fcc$ SnH${}_4$ 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.

arXiv commentAdditional acknowledgments are made, one more co-author has been added, equations of the Talantsev-Tallon model have been added and clarified. They were used to obtain the superconducting gap from the V-I characteristics. We also added cif files of tin hydrides to SI

References in corpus (42)

• Conventional superconductivity at 203 K at high pressures
• Superconductivity at 250 K in lanthanum hydride under high pressures
• Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Weak localisation in graphene flakes
• Anomalous high-temperature superconductivity in YH${}_6$
• Superconductivity at 161 K in Thorium Hydride $Th{H}_{10}$: Synthesis and Properties
• Universal $T$-linear resistivity and Planckian limit in overdoped cuprates
• Superconductivity at 253 K in lanthanum-yttrium ternary hydrides
• Superconductivity above 200 K Observed in Superhydrides of Calcium
• High-Temperature Superconductivity in Cerium Superhydrides
• On Distribution of Superconductivity in Metal Hydrides
• Hole-Doped Cuprate High Temperature Superconductors
• Enhancement of the superconducting critical temperature realized in the La-Ce-H system at moderate pressures
• Universal self-field critical current for thin-film superconductors
• Strong correlation between bonding network and critical temperature in hydrogen-based superconductors
• High-Pressure Synthesis of Barium Superhydrides: Pseudocubic BaH12
• The Strange Metal State of the Electron-Doped Cuprates
• Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal
• Disorder and Quantum Fluctuations in Superconducting Films in Strong Magnetic Fields
• High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride
• Nonstandard superconductivity or no superconductivity in hydrides under high pressure
• Is ZrB12 two gap superconductor?
• Thermodynamic parameters of single- or multi-band superconductors derived from self-field critical currents
• Effect of paramagnetic impurities on superconductivity in polyhydrides: $\text{s}$-wave order parameter in Nd-doped LaH${}_{10}$
• High T_c superconductivity due to coexisting wide and narrow bands: A fluctuation exchange study on the Hubbard ladder as a test case
• Multiband Nature of the Room-Temperature Superconductivity in Compressed LaH${}_{10}$
• Strange metal behaviour from charge density fluctuations in cuprates
• Superconductivity of novel tin hydrides (Sn${}_n$H${}_m$) under pressure
• Non-Fermi-Liquid Behavior of Superconducting SnH${}_4$
• Breakdown of the Migdal-Eliashberg theory and a theory of lattice-fermionic superfluidity
• Interaction Effects in Conductivity of a Two-Valley Electron System in High-Mobility Si Inversion Layers
• Sr-Doped Molecular Hydrogen: Synthesis and Properties of SrH${}_{22}$
• Electrons with Planckian scattering obey standard orbital motion in a magnetic field
• Superconductivity and unexpected chemistry of germanium hydrides under pressure
• Electron-phonon coupling and superconductivity in an alkaline earth hydride CaH${}_6$ at high pressures
• Universal Fermi velocity in highly compressed hydride superconductors
• Single-parameter scaling in the magnetoresistance of optimally doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Classifying superconductivity in ThH-ThD superhydrides/superdeuterides
• Unconventional superconductivity in highly-compressed unannealed sulphur hydride
• Classifying charge carrier interaction in highly-compressed elements and silane

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• Broadening of In-Field Superconducting Transitions in Hydrides
• $d$-wave superconductivity as a model for diborides apart MgB${}_2$
• Quasi Two-dimensional Vortex Matter in ThH${}_{10}$ Superhydride
• Ternary superhydrides under pressure of Anderson's theorem: Near-record superconductivity in (La,Sc)H${}_{12}$
• Superconductor discovery in the emerging paradigm of Materials Informatics
• Structural and superconducting parameters of highly compressed sulfur
• Stability and Superconductivity of Ternary Polyhydrides
• Reply to "Comment on `Nonstandard superconductivity or no superconductivity in hydrides under high pressure' "
• Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite
• Observation of the Josephson effect in superhydrides: DC SQUID based on (La,Ce)H${}_{10+x}$ with operating temperature of 179 K