Superconductivity in a new layered triangular-lattice system Li2IrSi2
Superconductivity in a new layered triangular-lattice system Li2IrSi2
复制标题
新型层状三角晶格系统 Li2IrSi2 中的超导性
DOI：
10.1088/1367-2630/ab4159
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发表时间：
2019
影响因子：
3.3
通讯作者：
J. Akimitsu
中科院分区：
文献类型：
--
作者：
K. Horigane;K. Takeuchi;D. Hyakumura;R. Horie;T. Sato;T. Muranaka;K. Kawashima;H. Ishii H;Y. Kubozono;S. Orimo;M. Isobe;J. Akimitsu
我们报道了一种新型铱硅化物Li 2 IrSi 2 的晶体结构和超导性能。它具有Ag 2 NiO 2 型结构（空间群R-3m），晶格参数a= 4.028 30 (6) Å 和c= 13.161 80 (15) Å。晶体结构包括沿c轴交替堆叠的IrSi 2 和双层Li层。 IrSi 2 层包括二维Ir等边三角形晶格。电阻率和静磁测量表明，Li 2 IrSi 2 是一种II型超导体，临界温度（T c）为3.3 K。我们估计了以下超导参数：下临界场H c1 (0)∼ 42 Oe，上临界场H c2 (0)∼ 1.7 kOe，穿透深度λ 0∼ 265 nm，相干长度ν 0∼ 44 nm，以及Ginzburg-Landau参数κGL∼6.02。比热数据表明Li 2 IrSi 2 的超导性可归因于弱耦合库珀对。
We report on the crystal structure and superconducting properties of a novel iridium-silicide, namely Li 2 IrSi 2. It has a Ag 2 NiO 2-type structure (space group R-3m) with the lattice parameters a= 4.028 30 (6) Å and c= 13.161 80 (15) Å. The crystal structure comprises IrSi 2 and double Li layers stacked alternately along the c-axis. The IrSi 2 layer includes a two-dimensional Ir equilateral-triangular lattice. Electrical resistivity and static magnetic measurements revealed that Li 2 IrSi 2 is a type-II superconductor with critical temperature (T c) of 3.3 K. We estimated the following superconducting parameters: lower critical field H c1 (0)∼ 42 Oe, upper critical field H c2 (0)∼ 1.7 kOe, penetration depth λ 0∼ 265 nm, coherence length ξ 0∼ 44 nm, and Ginzburg–Landau parameter κ GL∼ 6.02. The specific-heat data suggested that superconductivity in Li 2 IrSi 2 could be attributed to weak-coupling Cooper pairs.