Magnetoresistance of the magnetically ordered icosahedral quasicrystals Al-Pd-Mn-B

The transverse magnetoresistance has been measured for the newly discovered magnetically ordered icosahedral quasicrystals Al70−xPd15Mn15Bx (x=0,2,4,6,8,10). Experiments were conducted at 4.2 K in magnetic fields up to 5.5 T. The results showed a systematic change as a function of boron concentration. The magnetoresistance for x=0,2,4,6 showed a negative field dependence which became weak with increasing x. The samples with x=8,10 showed a negative magnetoresistance at low fields, which became positive for higher applied fields. The minimum in the magnetoresistance shifted to lower field value with increasing boron content (to about 0.5 T for 10 at. %B). The analysis of the results has been based on the theory of three-dimensional weak localization, with a strong influence of spin-orbit scattering. The magnetoresistance is negative for low boron concentration due to weak spin-orbit scattering, and is positive for high boron concentration due to strong spin-orbit scattering.

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