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D.Pavuna,M.Abrecht,D.Clo?tta,X.X.Xi,Margaritondo,D.Ariosa 한국물리학회 2002 Current Applied Physics Vol.2 No.4
Properties of ultra-thin films are dierent from their single crystal counterparts due to the presence of (substrate induced)strain,dierent degree and type of (growth induced)disorderand dierent averagedoping (distribution of oxygen vacancies, for example).! 1 unit cell (UC)) superconducting oxide lms grown by laser ablation.Systematic studies show that BSCCO-2212, 2201, 2223, and LSCO-214 exhibit conductor-like Fermi edge, whereas materialscontaining ‘‘chains’’ (like YBCO-123) are prone to very rapid surface degradation, possibly related to critical oxygen loss at theoutermost layers. Combined with X-ray analysis we have determined that BSCCO-2212 lms undergo a structural phase transitionat a nominal thickness of approximately 1 UC, converting the precursor Bi2O2:33 highly coherent ultra-thin lm into the Bi-2212214 thin lms (withTc of up to 44 K) are also discussed. For the rst time the dispersion in ARPES spectra measured on such in situgrown strained LSCO lm is shown. The relevance of these new results is briey discussed.. 2002 Published by Elsevier Science B.V.