Transport properties of Ho1−x Lu x B12 solid solutions
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Our studies of Ho1−x Lu x B12 solid solutions have shown that the temperature of antiferromagnetic (AF) order in geometrically frustrated system of HoB12 (T N = 7.4 K) is linearly suppressed to zero temperature, i.e. T N → 0, as lutetium concentration increases to x→x c ≈ 0.9. In this contribution, we present original results of electrical resistivity measurements on Ho1−x Lu x B12 single crystalline samples with x = 0, 0.2, 0.5, 0.7, 0.9, 1 in the temperature range 0.06–300 K and in magnetic fields (B) up to 8 T. Complex B vs T N phase diagrams were received from precise temperature ρ(T) and field ρ(B) dependences of resistivity with several AF phases for x ≤ 0.5 pointing to a possibility of quantum critical point at x c ≈ 0.9. The scattering of conduction electrons in the AF phase and in the paramagnetic phase as well as Hall effect results are analyzed and discussed for various concentrations x, when magnetic dilution increases with the increasing content of nonmagnetic Lu ions in the Ho1−x Lu x B12 system.
KeywordsQuantum phase transition Geometric frustration Low temperatures Resistivity Hall effect
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