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AeIEEAAe

II OECEEA

IA OAIO:

«NAA?OI?IAIAeIEEE»

Auiieiee o/aiee 10«A» eeanna

Oeieu?528 OeAI ai?iaea IINEAU

Naiay A. A.

IINEAA 14.03.1999 aiae

Naa?ooiieea YBCO ieaiee n On auoa 77E

Naa?ooiieea (< 10ii) AONI ieaiee i?aaenoaaeytho eioa?an eae aeey oece/aneeo enneaaeiaaiee, oae e aeey i?aeoe/aneiai eniieueciaaiey, a /anoiinoe a NA*-yeaeo?iieea: aeaeicaoniiianeea ia?aoiaeu, iieaaua i?eai?u, iaeeiaeiua yeaiaiou iee?iaieiiauo noai, eio?ae?aniua aeaoaeoi?u e o.i.Iaeiaei e?eoe/aneay oaiia?aoo?a On ieaiie YBCO ?acei nieaeaaony i?e oiaiueoaiee oieueiu ieaea 10ii. Ioaaonoaaiiinoue ca yoi ianoo eae ooiaeaiaioaeueiua iaoaieciu (ia?aoiae Einoa?eeooea - Oaoeanna, ia?aaea/a ca?yaea iiaeaeaeiuo iineoaeae /a?ac eioa?oaen), oae e /enoi oaoiieiae/aneea i?e/eiu – ?anniaeaniaaiea ia?aiao?ia ?aoaoee iiaeeiaeee e ?anoouae ieaiee. Noaiaea?oiue i?eai oeo/oaiey naa?oi?iaiaeyueo naienoa naa?ooiieeo ieaiie – eniieueciaaiea aooa?iiai neiy iaaeaeo iiaeeiaeeie e ieaieie; i?e yoii iaoa?eae aooa?iiai neiy aeieaeai eiaoue iaiaoaeee/aneea naienoaa e iaeneiaeueii aeeceea e YBCO ia?aiao?u ?aoaoee. Eo/oei aooa?iui iaoa?eaeii aeey YBCO ieacaeny PrBa2Cu3O7 (PBCO); aai eniieueciaaiea nouanoaaiii iiauneei cia/aiea On, ii aaaeiue ?oaaae a 77E oae e ia aue ia?aeaeai.Aeey oeo/oaiey naa?oi?iaiaeyueo naienoa naa?ooiieeo YBCO ieaiie a ioaeaea /eai-ei??. ?AI Eai?y Anaaieiaeiae/a A?aoiaa (OOE ei. Eiooa ?AI) i?aaeeiaeeee i?eioeeieaeueii iiaoth no?oeoo?o aooa?iiai neiy – eiiiiceoiue aeeyeaeo?ee, ninoiyuee ec e?enoaeeeoia ecieyoi?a YBa2NbO6 (YBNO) e naa?oi?iaiaeieea (YBCO). Oaeie neie iiaeii i?eaioiaeoue iaoiaeii eaca?iiai ?aniueaiey ieoaie, neioace?iaaiiie ec ieeneia Y, Ba, Cu, Nb. Ieaiea aooa?iiai neiy n oeie/iie oieueiie ~ 30ii oi?ie?oaony ia iiaeeiaeea SrTiO3. Aeeo?aeoeeiiiua ?aioaaiianeea niaeo?u iieacuaatho, /oi aooa?iay ieaiea ninoieo ec niane oac YBCO (n iiieaeaiiui niaea?aeaieai eenei?iaea) e YBNO, eiathuae eoae/aneoth no?oeoo?o a iinoiyiiie ?aoaoee a=0.84ii. Oa?aeoa?iue ?acia? a?aioe - 100-500ii.Enneaaeiaaiey ?aiieo noaaeee ?inoa ieaiie n iiiiuueth aoiiii-neeiaiai iee?ineiia iieacaee, /oi oaca YBCO a aooa?iii neia aeaiiino?e?oao 3-D ino?iaeiaue ?ino, a oaca YBNO oi?ie?oao ?iaiia ieaoi. Iaa oacu ninouanoaotho aie i aie, e aaeece a?aieoeu ?acaeaea oac ia aeeyeaeo?e/aneii ieaoi YBNO anaaaea i?enoonoaoao iaeioi?ia eiee/anoai 2-D ca?iaeuoae YBCO, eioi?ua iiaoo yaeyoueny oeaio?aie ca?iaeuoaia?aciaaiey iiaiai iieaeoey?iiai neiy YBCO i?e inaaeaeaiee YBCO ia YBaCuNbO aooa?iue neie.Naa?ooiieea ieaiee YBCO, inaaeaeaiiua iaiin?aaenoaaiii ia iiaeeiaeeo SrTiO3, oi?ie?othony iooai aeaoia?iiai ca?iaeuoaia?aciaaiey n iineaaeothuei ?inoii a ieineinoe a-b. A oi aea a?aiy eae iaoaieciii ?inoa naa?ooiieeo ieaiie YBCO ia YBaCuNbO aooa?iii neia yaeyaony eieaeueiia ?ani?ino?aiaiea nooiaiae. A ?acoeueoaoa naa?ooiieea ieaiee YBCO, inaaeaeaiiua ia SrTiO3 iiaeeiaeeo e ia YBaCuNbO aooa?iue neie, eiatho ?acioth ii?oieiaeth iiaa?oiinoe. Aaoi?u n/eoatho, /oi eiaiii iaoaieci ?inoa iooai eieaeueiiai ?ani?ino?aiaiey nooiaiae iicaieyao oeo/oeoue niaa?oainoai e?enoaeee/aneie no?oeoo?u naa?ooiieie YBCO e oaaee/eoue e?eoe/aneoth oaiia?aoo?o.I?eiaiaiea i?eioeeieaeueii iiaiai aooa?iiai neiy iicaieeei iiaeiyoue On n 68E aei 80E (a ieaiea oieueiie a 3 y/aeee) e aei 86E (a ieaiea oieueiie a 4 y/aeee). Yoi iiea eo/oee a ie?a ?acoeueoao aeey ieaiie YBCO oaeie oieueiu.Aeaeeia?aoeyPhysica C, 1997, 276, n.18Proc.MRS 1998 Fall Meeting, Boston, USAEiioaeou naa?oi?iaiaeieea n oa??iiaaiaoeeiiEnneaaeiaaiea i?ioeannia ia a?aieoea naa?oi?iaiaeieea n oa??iiaaieoiui iaoaeeii i?eaaei e iaiau/iui ?acoeueoaoai: iaiiiioiiiay caaeneiinoue naa?oi?iaiaeyuae e?eoe/aneie oaiia?aoo?u iiiaineieiuo no?oeoo? oa??iiaaiaoee (F) - naa?oi?iaiaeiee (S), iao?eaeaeueiia iiaaaeaiea iaaieoinii?ioeaeaiey SFS no?oeoo? e iiaeaaeaiea naa?oi?iaiaeyueo naienoa a ?acoeueoaoa niei-iiey?eciaaiiie eiaeaeoeee.A eiioea 1998 - ia/aea 1999 aiaea iiyaeeny ?yae iiauo eio?eaothueo ioaeeeaoeee. Oae, a ?aaioa yenia?eiaioaeueii enneaaeiaaeenue oiieiieaii/iua iaiino?oeoo?u, ia?aciaaiiua eiaaeueoii eee ieeaeai ni naeioeii. Iniiaiay eaeay caeeth/aaony a oii, /oi aiae?aaaneia io?aaeaiea ia FS a?aieoea i/aiue /oanoaeoaeueii e iiey?ecaoeee yeaeo?iiia i?iaiaeeiinoe a oa??iiaaiaoeea. Aeaenoaeoaeueii, niaeanii noiia?ianeie ciiiie iiaeaee oa??iiaaiaoeci a iaoaeeao iaoneiaeai ?acee/iui caiieiaieai iiaecii, ia?acoaiuo yeaeo?iiaie n i?ioeaiiieiaeiuie iai?aaeaieyie nieiia. A oi aea a?aiy aeey i?ioiaeaeaiey yeaeo?iia ec ii?iaeueiie iaeeaaeee a naa?oi?iaiaeyuoth “iiaeeaoathuee” e NS a?aieoea yeaeo?ii aeieaeai caoaaoeoue n niaie ae?oaie yeaeo?ii n i?ioeaiiieiaeiui eiioeuenii e nieiii, /oiau ia?aciaaoue a naa?oi?iaiaeieea eoia?ianeoth ia?o (ia ycuea aiae?aaaneiai io?aaeaiey yoi icia/aao, /oi yeaeo?iiiia ninoiyiea ?annaeaaaony a aeu?i/iia n i?ioeaiiieiaeiui nieiii e eiioeuenii, i?aeoe/anee niaiaaeathuei n eiioeuenii enoiaeiiai yeaeo?iia).Iaeiaei, anee “iiaeeaoathuee” yeaeo?ii i?eiaaeeaaeeo, iai?eia?, e aeiieie?othuae iiaeciia oa??iiaaiaoeea, oi o iaai iiaoo aicieeiooue i?iaeaiu n iieneii ia?oia?a, oae eae ieioiinoue yeaeo?iiia ia iiaa?oiinoe Oa?ie aeey ae?oaie iiaeciiu (n i?ioeaiiieiaeiui nieiii) caiaoii iaiueoa. A ?acoeueoaoa aiae?aaaneia ?annayiea aeieaeii iiaeaaeyoueny a oa??iiaaieoiuo iaoaeeao aieioue aei iieiiai en/aciiaaiey, anee iu eiaai aeaei ni 100% iiey?eciaaiiie ciiiie no?oeoo?ie. Eiaiii yaeaiea iiaeaaeaiey aiae?aaaneiai io?aaeaiey a NS eiioaeoao i?e caiaia iau/iiai ii?iaeueiiai iaoaeea ia oa??iiaaiaoee e auei iiaeoaa?aeaeaii aeaiiuie aaoi?ia. A ae?oaie yenia?eiaioaeueiie ?aaioa eco/ai nianoaaiii yooaeo aeecinoe, o.a. i?iieeiiaaiea naa?oi?iaiaeyueo naienoa aaeoaue oa??iiaaiaoeea. Eae ecaanoii, a a?yciii i?aaeaea yia?aaoe/aneie oa?aeoa?enoeeie, ii?aaeaeythuae yooaeo aeecinoe, yaeyaony aaee/eia, ?aaiay h D/L , aaea D - eiyooeoeeaio aeeooocee, a L - ?acia? ia?acoea. Aa?ii e ia?aoiia ooaa?aeaeaiea: ?annoiyiea, ia eioi?ia i?iieeaao naa?oi?iaiaeeiinoue, ii ii?yaeeo aaee/eiu ?aaii O h D/E, caeanue E – yoi oa?aeoa?iay yia?aey, ii?aaeaeythuay iiaeaaeaiea naa?oi?iaiaeyuaai nia?eaaiey a ii?iaeueiii iaoa?eaea. A neo/aa oa??iiaaiaoeea a ea/anoaa E neaaeoao acyoue yia?aeth iaiaiiiai acaeiiaeaenoaey, eioi?oth a naith i/a?aaeue iiaeii iieiaeeoue ?aaiie oaiia?aoo?a Eth?e. Oae aio, auiieiaiiay oaeei ia?acii ioeaiea aeaea aeey eiioaeoa eiaaeueoa ni naa?oi?iaiaeyuei aethieieai i/aiue caieaeaiiua ?acoeueoaou, o.a. ?aaeueiay aeeeia caoooaiey naa?oi?iaiaeyueo naienoa a eiaaeueoa ieacaeanue iaiiiai aieueoa oai?aoe/anee i?aaeneacaiiie.Oiiiyiai aua oai?aoe/aneea ?an/aou i?iaiaeeiinoe iacineiie/aneeo FS no?oeoo?, auiieiaiiua R. Seviour e C. J. Lambert ec Aaeeeia?eoaie niaianoii n A. O. Aieeiaui ec E?Y, a oaeaea I. Zutic e O. T. Valls ec NOA. Eie i?aaeneacaii iaiiiioiiiia iiaaaeaiea aeeooa?aioeeaeueiie i?iaiaeeiinoe eae ooieoeee iai?yaeaiey i?e iai?yaeaieyo, ioaa/athueo caaiaiianeiio ?anuaieaieth, a ?aeiia ioeaauo niauaiee e i?. E, iaeiiaoe, inoaiiaeiny ia oeeeea ?aaio T. W. Clinton e M. Johnson ec Naval Research Laboratory (Washington), eioi?ua i?aaeeiaeeee oi?aaeyaiue aeaeicaoniiianeee yeaiaio ia iniiaa i?inoie aeaoneieiie aaiiao?ee, aaea oiieay oa??iiaaieoiay ieaiea eieaeueii iiaeaaeyao naiei iaaieoiui iieai naa?oi?iaiaeeiinoue a iieinea, ia eioi?oth iia iaianaia, ii?iaeaeay oai naiui neaaoth naycue. Iaaethaeaiea nooiaiae Oaie?i iiaeoaa?aeeei iaee/ea ianoaoeeiia?iiai yooaeoa Aeaeicaoniia a aeaiiie no?oeoo?a, eioi?oth aaoi?u n/eoatho ia?niaeoeaiui yeaiaioii aoaeouae e?eiyeaeo?iieee.Aeaeeia?aoeyJ. Low Temp. Phys., 1986, 63, n.307J. Phys. Condens. Matter, 1996, 39, n.L563Phys. Rev. Lett., 1997, 78, n.1134Phys. Rev. Lett., 1998, 81, n.3247Phys. Rev. Lett., 1995, 74, n.16570Phys. Rev. B, 1998, 58, n.R11872Appl. Phys. Lett., 1997, 70, n.1170J. Appl. Phys., 1998, 83, n.6777

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