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000186690 1001_ $$0P:(DE-HGF)0$$aBauer, A.$$b0$$eCorresponding Author
000186690 245__ $$aLow-temperature properties of single-crystal CrB$_{2}$
000186690 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000186690 520__ $$aWe report the low-temperature properties of 11B enriched single-crystal CrB2 as prepared from high purity Cr and B powder by a solid-state reaction and optical float-zoning. The electrical resistivity, ρxx, Hall effect, ρxy, and specific heat, C, are characteristic of an exchange-enhanced Fermi liquid ground state, which develops a slightly anisotropic spin gap Δ≈220~K below TN=88~K. This observation is corroborated by the absence of a Curie dependence in the magnetisation for T→ 0 reported in the literature. Comparison of C with dxx=dT , where we infer lattice contributions from measurements of VB2, reveals strong antiferromagnetic spin fluctuations with a characteristic spin fluctuation temperature Tsf≈257~K in the paramagnetic state, followed by a pronounced second order mean-field transition at TN, and unusual excitations around ≈TN/2. The pronounced anisotropy of ρxx above TN is characteristic of an easy-plane anisotropy of the spin fluctuations consistent with the magnetisation. The ratio of the Curie-Weiss to the Neel temperatures, f=−ΘCW/TN≈ 8.5, inferred from the magnetisation, implies strong geometric frustration. All physical properties are remarkably invariant under applied magnetic fields up to 14~T, the highest field studied. In contrast to earlier suggestions of local moment magnetism our study identifies CrB2 as a weak itinerant antiferromagnet par excellence with strong geometric frustration.
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000186690 7001_ $$0P:(DE-HGF)0$$aRegnat, A.$$b1
000186690 7001_ $$0P:(DE-HGF)0$$aBlum, C. G. F.$$b2
000186690 7001_ $$0P:(DE-HGF)0$$aGottlieb-Schönmeyer, S.$$b3
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000186690 7001_ $$0P:(DE-HGF)0$$aKuneš, J.$$b7
000186690 7001_ $$0P:(DE-HGF)0$$aPfleiderer, C.$$b8
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