Transmission electron micrograph showing CrO2 powder with acicular particles. This powder was used to prepare samples 1–3.
Magnetization hysteresis curves in sample 3 at T = 5.1 K
Temperature dependence of the specific resistance in the investigated pressed CrO2 samples. Numbering of the curves corresponds to the sample numbers.
MR hysteresis curves in sample 4 at T, K: 4.17 (a) and 20.43 (b). The inserts show the behavior of MR in low magnetic fields. Arrows indicate the direction of magnetic field sweeps. A vertical arrow in the insert corresponding to T = 4.17 K indicates the field Hp at which the maximal value of resistance was observed.
MR hysteresis curves in sample 2 at three different values of temperature T, K: 4.4 (a), 10 (b), and 20 (c). Arrows indicate the direction of magnetic field sweeps.
Temperature dependence of the field Hp (corresponding to the peak in positive MR) and the coercive force Hc in sample 3.
Temperature dependence of MR in samples 2, 3 (in magnetic field of 1.5 T) and sample 4 (in magnetic field of 1.2 T).
MR hysteresis curves at 4.4 K in sample 1 (△, ▲) and sample 2 (□, ▪). Arrows indicate the direction of magnetic field sweeps.
Characteristics of the investigated pressed CrO2 powders.
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