Preparation and Superconducting Properties of Thin Films of Transition Metal Interstitial Compounds
Preparation and Superconducting Properties of Thin Films of Transition Metal Interstitial Compounds
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DOI：
10.1116/1.1492653
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发表时间：
1969
期刊：
影响因子：
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通讯作者：
J. Gavaler;J. Hulm;M. Janocko;C. K. Jones
中科院分区：
文献类型：
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作者：
J. Gavaler;J. Hulm;M. Janocko;C. K. Jones
几何参数在确定材料超导性质中的重要性，是近年来理论界研究的热点。迄今为止，这一领域的实验研究主要限于非过渡元素的薄膜结构，与具有相对小的超导非参数（K）的材料相比。本文讨论了具有高临界温度（Tc ≥ 14 °K）和大上临界场（Hc 2 ≥ 100 kOe）的过渡金属化合物薄膜结构的一些最新研究结果。这项工作中的材料具有岩盐结构（B1），并基于化合物氮化铌NbN。薄膜是在背景压力为10 ×10 - 10 Torr的真空系统中，在氩-氮气氛中通过反应溅射制备的。氮分压在10 - 3至10 - 6 Torr范围内的变化用于获得不同的膜组成。
The importance of geometrical parameters in determining the superconducting properties of a material has recently been a topic of considerable theoretical interest. Experimental investigation in this area so far has been restricted principally to thin-film structures of the non-transition elements, compared of materials possessing relatively small superconducting non-parameters (K). In this paper we discuss some recent studies on thin-film structures of transition metal compounds having both high critical temperatures (Tc≳14 °K) and large upper critical fields (Hc2≳100 kOe). The materials in this work have the rocksalt structure (B1) and are based upon the compound niobium nitride, NbN. The films were prepared by reactive sputtering in argon-nitrogen atmospheres in an ultrahigh vacuum system with a background pressure ≲5×10−10 Torr. Variation of the nitrogen partial pressure over the range 10−3 to 10−6 Torr was used to obtain different film compositions.