Magnetization Study on the History-Dependent Peak Effect in the Superconducting Mixed State of CeRu_2

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A htrge peak of' irrex'er'sible uaaagraetization in Centre single crystal, together xvitl? the eqtrilila-rittraa naaagrxetization, XV2lS investigarted Icy uaaeatas of' a static taustguuetizatiora taaeastrretaaent ttsinga Far'aday f'orce rn?rgnetouneter. Tlae residtr?t1 resistance rattio of' tlae trsed crystal exceeds 250,iradicstting that it is 21 c1e?tru strpercorndtrctor. Contrary to tlae previotrs reports, there is 110pinnitag-f'ree region in the raaagtaetiz;rtion ctrrves beloxv the trpper critical field H.3. The detailedminor-hysteresis-loop taaeastureraaent laas revealed tluat the peak strttcttrre in the increasing-fieldtaaagnetizatiota curx'e arotrnd the onaset field of' the pe?tk strongly depends Oil previotrs field-history,resttlting in ata appatrent asytaauaaetry of' the pestk structtrre. No tr'ace of par?tmagnetic strjcpr'essionof strpercondtrctivity ita tlae x'ortex-jcenetrated statte is observed frottu the strper'condtrcting equilib-ritrtaa raaagnetization CUTING(28. The peak position, atlthotrgh highly ?tnisotropic, C2111 be interrelatedto the joeak strength, regardless of' the stpjolied field directioua. It is 1ikel5z that tlae irreversibilitypeak is dtme to a syncluroniz?ttion pinraing of' the de['ective fltrx line lattice, r'ather than due to afirst-order transitiora f'rotaa tire raaixed state to the Ftrlde-Ferrell-Lstrkitu-Ovchinnikov state.
社団法人日本物理学会の論文
1999-01-15