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/content/aip/journal/adva/6/5/10.1063/1.4943922
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/content/aip/journal/adva/6/5/10.1063/1.4943922
2016-03-09
2016-09-28

Abstract

TiCrCu is a new ternary compound which crystallizes in the tetragonal TiPd structure type. The Cr atoms form square nets in the - plane ( = 3.124 Å) which are separated by an unusually large distance = 11.228 Å along the tetragonal axis, thus forming a -2-D Cr-sublattice. The paramagnetic susceptibility is characterized by a low effective moment, μ = 1.1 μ, a low paramagnetic Curie temperature θ (below 7 K) and a temperature independent χ = 6.7 x 10−4 emu/mol. The magnetization at 1.8 K increases rapidly with field nearly saturating to 0.2 μ/f.u. The zero field heat capacity C/T shows an upturn below 7 K (∼190 mJ/mol K2 at ∼0.1K) which is suppressed in applied magnetic fields and interpreted as suggesting the presence of spin fluctuations. The resistivity at low temperatures shows non-Fermi liquid behavior. Overall, the experimental data thus reveal an unusual magnetic state in TiCrCu, which likely has its origin in the layered nature of the Cr sub-lattice and ferromagnetic spin fluctuations. Density functional theoretical calculations reveal a sharp Cr density of states peak just above the Fermi level, indicating the propensity of TiCrCu to become magnetic.

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