We report on the quasi-linear in field intrachain magnetoresistance in the normal state of a quasi-one-dimensional superconductor Ta 4 Pd 3 Te 16 (T c ∼4.6 K). Both the longitudinal and transverse in-chain magnetoresistance shows a power-law dependence, ∆ρ∝B α , with the exponent α close to 1 over a wide temperature and field range. The magnetoresistance shows no sign of saturation up to 50 tesla studied. The linear magnetoresistance observed in Ta 4 Pd 3 Te 16 is found to be overall inconsistent with the interpretations based on the Dirac fermions in the quantum limit, charge conductivity fluctuations as well as quantum electron-electron interference. Moreover, it is observed that the Kohler's rule, regardless of the field orientations, is violated in its normal state. This result suggests the loss of charge carriers in the normal state of this chain-containing compound, due presumably to the charge-density-wave fluctuations.
Due to inereasing demands for mieroandlor high-precision parts, ultra-miert) cutting technologies hftve been developed at high speed, The importance of atmosphcre in micre cutting has beert reoognized morc and mora in Tecerit researches. This is because the effects of cuthng enyironments andlor surface oxidation ofa workpieee inerease when the scale of cuttirtg decreases, In this paper, based on the results of a series of cuttirig experimerrts, we discuss bow the atmospheric molecu!es affect the pertbrmance of microctnting. The cutting force, critical dqpth of eut and scratchcs fomied on the workpiece surface have been examined and compared between the resuks of cutting in air and those in yacuum environments.Tlie workpieces are silicon mono-erystals that have bcen exposed to air for various lerigths oftime after being cleaned with RCA method, The experimental results skow that brittlelductile trar:sition takes place with smaller depth of cut in air than in a vacuum. This impljes that thc briuleness of a silicon meno-erystal deereases in a vacuum.On the other han¢ from the comparison of results obtairred using a tool moving back and fbrth in air and in a vacuuml t't has also been found that cutting force decreases if atmospheric rnolecules are sandwiched betwecn a tool and chip durmg cutting. This could be because of thc lubrication effbct of the atmospheric molecules.
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