Crystal Chemistry and Physical Properties of the Nonmagnetic Kondo Compound HfAs1.7Se0.2 (pages 2639–2644)
Andreas Czulucki, Gudrun Auffermann, Michal Bednarski, Łukasz Bochenek, Maik Böhme, Tomasz Cichorek, Rainer Niewa, Niels Oeschler, Marcus Schmidt, Frank Steglich and Rüdiger Kniep
Article first published online: 14 JUL 2010 | DOI: 10.1002/cphc.201000040
A diamagnetic metal which transforms into a superconducting state at 0.52 K, HfAs1.7Se0.2 is grown as single crystals by chemical transport reaction. Crystal structure investigations reveal a tetragonal PbFCl-type structure (see figure) with strong disorder caused by a significant arsenic deficiency (As0.9) on the 2a site and mixed occupancy of the 2c site (As0.8Se0.2). Furthermore, HfAs1.7Se0.2 appears to be a rare example of a nonmagnetic Kondo material.