Non-Fermi-Liquid Behavior of Superconducting SnH4

被引：18
|
作者：
Troyan, Ivan A. [1 ]
Semenok, Dmitrii V. [2 ]
Ivanova, Anna G. [1 ,4 ]
Sadakov, Andrey V. [3 ]
Zhou, Di [2 ]
Kvashnin, Alexander G.
Kruglov, Ivan A. [5 ,6 ]
Sobolevskiy, Oleg A. [3 ]
Lyubutina, Marianna V. [1 ]
Perekalin, Dmitry S. [7 ]
Helm, Toni [8 ]
Tozer, Stanley W. [9 ]
Bykov, Maxim [10 ]
Goncharov, Alexander F. [11 ]
Pudalov, Vladimir M. [3 ,12 ]
Lyubutin, Igor S. [1 ]
机构：
[1] Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, 59 Leninsky Prospekt, Moscow 119333, Russia
[2] Ctr High Pressure Sci & Technol Adv Res HPSTAR, Beijing 100193, Peoples R China
[3] Russian Acad Sci, Lebedev Phys Inst, VL Ginzburg Ctr High Temp Superconduct Quantum Mat, Moscow 119991, Russia
[4] Skolkovo Inst Sci & Technol, Bolshoy Blvd 30 1, Moscow 121205, Russia
[5] Dukhov Res Inst Automat VNIIA, Ctr Fundamental & Appl Res, st Sushchevskaya 22, Moscow 127055, Russia
[6] Moscow Inst Phys & Technol, Lab Computat Mat Discovery, 9 Institutsky Lane, Dolgoprudnyi 141700, Russia
[7] Russian Acad Sci, AN Nesmeyanov Inst Organoelement Cpds, 28 Vavilova Str, Moscow 119334, Russia
[8] Helmholtz Zentrum Dresden Rossendorf HZDR, Hochfeld Magnetlabor Dresden HLD EMFL, D-01328 Dresden, Germany
[9] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
[10] Univ Cologne, Inst Inorgan Chem, D-50939 Cologne, Germany
[11] Carnegie Inst Sci, Earth & Planets Lab, 5241 Broad Branch Rd NW, Washington, DC 20015 USA
[12] Natl Res Univ, Higher Sch Econ, HSE Tikhonov Moscow Inst Elect & Math, 20 Myasnitskaya ulitsa, Moscow 101000, Russia
来源：
ADVANCED SCIENCE | 2023年 / 10卷 / 30期
基金：
俄罗斯科学基金会;
关键词：
high pressure; non-Fermi-liquid; superconductivity; tin hydrides; CRYSTAL-STRUCTURES; HIGH-PRESSURES; TEMPERATURE; HYDRIDE; SYSTEM;
D O I：
10.1002/advs.202303622
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The chemical interaction of Sn with H-2 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-Sn12H18, is also detected. The temperature dependence of critical current density C-J(T) in SnH4 yields the superconducting gap 2 Delta(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) proportional to(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-Gruneisen 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.
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页数：10
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