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We report detailed study of the transport properties of FeSe$_{1-x}$S$_x$($x$ = 0 and 0.14) single crystals grown by vapor transport method. 14\% Sdoping is found significantly suppress the structural transition from $T_s$$\sim$ 86 K in FeSe to $\sim$ 49 K, although the superconducting transitiontemperature, $T_c$, is only slightly affected. A pronounced linearmagnetoresistance (MR) is observed in both FeSe and FeSe$_{0.86}$S$_{0.14}$single crystals, which is found to be triggered by the structural transition.The linear MR and related discussion indicate the possible existence ofDirac-cone-like state, which may come from the band shift induced byferro-orbital order. The mobility of the Dirac-cone-like band is found todecrease after S doping. Besides, the invalid Kohler's scaling of MR is foundfor temperature below $T_s$ in both crystals, however the re-establishment ofthe Kohler's scaling at temperatures below 30 K is observed in FeSe, but not inFeSe$_{0.86}$S$_{0.14}$. All these observations above support that the orbitalordering causes the band reconstruction in FeSe, and also that the orbitalordering in FeSe is suppressed by the chemical pressure from S doping.

physical review. b./physical review. b

Electron carriers with possible Dirac-cone-like dispersion in  FeSe$_{1-x}$S$_x$ ($x$ = 0 and 0.14) single crystals triggered by structural  transition