Superconductivity of InN caused by In‐In nano‐structure
Superconductivity of InN caused by In‐In nano‐structure
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DOI：
10.1002/pssc.200673228
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发表时间：
2007-02
期刊：
影响因子：
--
通讯作者：
T. Inushima
中科院分区：
文献类型：
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作者：
T. Inushima
在n型InN中存在超导性发生的最佳载流子密度。最低载流子密度受限于ne ~ 2 × 1017 cm-3的莫特跃迁，最高载流子密度受限于ne ~ 5 × 1020 cm-3的超导向金属跃迁。在这些载流子密度之间，InN表现出超导性，涡旋运动是通过微约瑟夫森结隧穿的电流。提出了一种机制，其中超导性的发生与两个u参数（3/8和5/8）的存在有关，这两个u参数在ab平面上产生有限长度的in - in链。In-In链源于In-In纳米结构沿[110]拉长，它们相互耦合形成微约瑟夫结。分子动力学计算得到的u -参数的温度依赖性表明了纳米结构不稳定的可能性。（©2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim）
There is an optimum carrier density for the occurrence of the superconductivity in n-type InN. The lowest carrier density is limited by the Mott transition of ne ∼ 2 × 1017 cm–3 and the highest density is limited by the superconductivity to metal transition of ne ∼ 5 × 1020 cm–3. Between these carrier densities, InN shows superconductivity and vortex motion is a current tunneling through micro Josephson-junctions. A mechanism is proposed where the occurrence of the superconductivity is related to the presence of two u -parameters of 3/8 and 5/8, which causes In-In chains of finite length in the ab plane. The In-In chains, which originate from the In-In nano-structure elongating along [110], are coupled to form micro Josephsonjunctions. A possibility of nano-structure instability is suggested by the temperature dependence of the u -parameter obtained by molecular dynamics calculations. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)