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Transport, magnetic and thermal properties of substitutional solid solution Eu1-xCaxB6 single crystals (0 <= x <= 0 244) have been studied at 1 8 <= T <= 300 K and in magnetic fields up to 8 T Calcium doping is shown to result in a metal insulator transition, which occurs at x(MIT) approximate to 0 2 In vicinity of metal insulator transition the effect of colossal magnetoresistance is found to be very sensitive to Ca content the amplitude varying from Delta = [rho(0) - rho(8 T)]/rho(8 T) approximate to 1 4 x 10(2) to Delta approximate to 7 5 x 10(3) for 0 14 <= x <= 0 16 The analysis of magnetic contribution to heat capacity shows that a large amount of magnetic entropy (approximate to 30%) releases in Eu-0 Ca-845(0) B-155(6) when moving from the Curie temperature T-C approximate to 5 5 K to the characteristic one T* approximate to 30 K. This observation as well as the large amplitude of low field colossal magnetoresistance effect and the deviation of magnetic susceptibility from the Curie-Weiss law detected for x = 0 155 compound in the interval T-C <= T <= T* seem to be associated with magnetic phase separation induced by Ca doping

Charge Transport and Magnetism in Eu1-xCaxB6

Charge Transport and Magnetism in Eu_1-xCa_xB₆