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We have studied the coupling of electronic and magnetic properties inFe1+y(Te1-xSex) via systematic specific heat, magnetoresistivity, and Hallcoefficient measurements on two groups of samples with y = 0.02 and 0.1. In they = 0.02 series, we find that the 0.09 < x < 0.3 composition region, wheresuperconductivity is suppressed, has large Sommerfeld coefficient Gamma (~55-65mJ/mol K^2), positive Hall coefficient R_H and negative magnetoresistance MR atlow temperature, in sharp contrast with the x=0.4-0.5 region where Gamma dropsto ~ 26 mJ/mol K^2 and R_H / MR becomes negative/positive at low temperature.Dramatic changes of Gamma, as well as sign reversal in low-temperature RH andMR, are also observed across the x~0.1 boundary where the long-rangeantiferromagnetic order is suppressed. However, for the system with richinterstitial excess Fe (y = 0.1), where bulk superconductivity is suppressedeven for x=0.4-0.5, the variations of Gamma, R_H and MR with x are distinctfrom those seen in y = 0.02 system: Gamma is ~40 mJ/mol K^2 for 0.1 < x < 0.3,and drops to ~ 34 mJ/mol K^2 for x = 0.4-0.5; R_H and MR does not show any signreversal as x is increased above 0.3. We will show that all these results canbe understood in light of the evolution of the incoherent magnetic scatteringby (pi,0) magnetic fluctuations with Se concentration. In addition, with thesuppression of magnetic scattering by magnetic field, we observed thesurprising effect of a remarkable increase in the superconducting volumefraction under moderate magnetic fields for x=0.3-0.4 samples in the y = 0.02system.

Coupling of electronic and magnetic properties in Fe1+y(Te1-xSex)