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We study the ab-plane resistivity and Hall e ect in the single crystals of Fe1−yMyTe0.65Se0.35, where M = Co or Ni (0 ≤ y ≤ 0.21). In case of each dopant two types of crystals, with di erent crystalline quality, are prepared by Bridgman's method using di erent cooling rates, fast or slow. The impurities suppress the superconducting transition temperature, Tc, with di erent rates. Tc reaches zero at markedly di erent impurity content: only 3 at.% of Ni, and about 14 at.% of Co. In addition, the suppression is somewhat dependent on the crystal cooling rate. The resistivity at the onset of superconductivity rises only weakly with the Co doping, while it increases 10 times faster for Ni. The Hall coe cient RH is positive for Co doping indicating that hole carriers dominate the transport. For Ni RH changes sign into negative at low temperatures for crystals with the Ni content exceeding 6 at.%. The implications of these results are discussed.

Influence of Iron Substitutions on the Transport Properties of FeTe_{0.65}Se_{0.35} Single Crystals