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Crystal Chemistry and Physical Properties of the Nonmagnetic Kondo Compound HfAs 1.7 Se 0.2
Author(s) -
Czulucki Andreas,
Auffermann Gudrun,
Bednarski Michal,
Bochenek Łukasz,
Böhme Maik,
Cichorek Tomasz,
Niewa Rainer,
Oeschler Niels,
Schmidt Marcus,
Steglich Frank,
Kniep Rüdiger
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000040
Subject(s) - tetragonal crystal system , chemistry , diamagnetism , arsenide , crystal structure , single crystal , crystallography , superconductivity , electrical resistivity and conductivity , kondo effect , paramagnetism , condensed matter physics , magnetic field , impurity , gallium arsenide , physics , quantum mechanics , organic chemistry
Single crystals of HfAs 1.7 Se 0.2 are grown by chemical transport reaction and their chemical composition characterized in detail by various analytical methods. Chemical analyses and crystal structure investigations by single‐crystal X‐ray diffraction as well as powder diffraction with synchrotron radiation reveal a tetragonal PbFCl structure type with strong disorder caused by a significant arsenic deficiency (As 0.9 ) on the 2a site and mixed occupancy of the 2c site (As 0.8 Se 0.2 ). HfAs 1.7 Se 0.2 is a diamagnetic metal which transforms into a superconducting state at T c =0.52 K. Similar to other PbFCl‐type arsenide selenides, the title compound displays a magnetic‐field‐independent − AT 1/2 term in the low‐temperature electrical resistivity. This unusual term presumably originates from the electron scattering of structural two‐level systems. According to the experimental results, HfAs1.7Se0.2 appears to be a rare example of a nonmagnetic Kondo material.