Structural instability and superconductivity in the solid solution SrNib>2b>(Pb>1−xb>Geb>xb>)b>2b>

详细信息    查看全文

• 作者：Viktor Hlukhyy ; Andrea V. Hoffmann ; Vadim Grinenko ; Juliane Scheiter ; Franziska Hummel ; Dirk Johrendt and Thomas F. F&auml ; ssler
• 刊名：physica status solidi (b)
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：254
• 期：1
• 全文大小：5312K
• ISSN：1521-3951

文摘

The solid solution SrNib>2b>(Pb>1−xb>Geb>xb>)b>2b> with ThCrb>2b>Sib>2b>-type structure has been synthesized over the whole composition range by high-temperature solid state reactions. Structure investigations were performed using X-ray diffraction (XRD) methods. In addition, in situ temperature-dependent powder XRD measurements down to 10 K were carried out for two SrNib>2b>(Pb>1−xb>Geb>xb>)b>2b> samples with x = 0.110(3) and 0.212(3), which indicate a temperature-induced collapse of the structure of the first compound around 200 K. For both samples, superconductivity was detected above 1.8 K by magnetic, resistivity, and heat capacity measurements (Tb>Cb> ∼ 3.0 and 2.4 K, respectively). The crystal chemistry and the chemical bonding in the superconducting compounds are discussed in terms of linear muffin-tin orbital (LMTO) band structure calculations including density of states (DOS), crystal orbital Hamilton populations (COHPs), and a topological analysis using the electron localization function (ELF).