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Introduction Macroscopicquantumphenomena(MQP)havebeeninvestigatedintensivelyformanyyears.AccordingtothepioneeringworksofCaldeiraandLeggett[1,2],ifthedissipationinteractionwiththeenvironmentwassmallenough,quantumtunnelingcouldtakeplaceonthemacroscopicscale.Overthelastfifteenyears,alotofexperimentalandtheoreticalworkhavebeendevotedtothisfield.Recently,owingmainlytothedevelopmentsoftechnologyinnanostructurephysics,manystudieshavefocusedonthenanometer-scalemagneticsystemswhichexhibitmacroscop… 相似文献
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