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Naslov:Influence of internal disorder on the superconducting state in the organic layered superconductor [kappa]-(BEDT-TTF)[sub]2Cu[N(CN)[sub]2]Br
Avtorji:Pinterić, Marko (Avtor)
Tomić, Silvija (Avtor)
Prester, Mladen (Avtor)
Drobac, Đuro (Avtor)
Maki, Kazumi (Avtor)
Datoteke:URL http://link.aps.org/abstract/PRB/v66/e174521
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGPA - Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo
Opis:We report high-sensitivity AC susceptibility measurements of the penetration depth in the Meissner state of the layered organic superconductor ▫$kappa$▫-(BEDT-TTF)▫$_2$▫Cu[N(CN)▫$_2$▫]Br. We have studied nominally pure single crystals from the two different syntheses and employed controlled cooling procedures in order to minimize intrinsic remnant disorder at low temperatures associated with the glass transition, caused by ordering of the ethylene moieties in BEDT-TTF molecule at ▫$T_{text{G}}$▫ = 75°K. We find that the optimal cooling procedures (slow cooling of -0.2°K/h or annealing for 3 days in the region of ▫$T_{text{G}}$▫) needed to establish the ground state, depend critically on the sample origin indicating different relaxationtimes of terminal ethylene groups. We show that, in the ground state, the behavior observed for nominally pure single crystals from both syntheses is consistent with unconventional $d$-wave order parameter. The in-plane penetration depth ▫$lambda_{text{in}}(T)$▫ is strongly linear, whereas the out-of-plane component ▫$lambda_{text{out}}(T)$▫ varies as ▫$T^2$▫. In contrast, the behavior of single crystals with long relaxation times observed after slow (-0.2°K/h) cooling is as expected for a $d$-wave superconductor with impurities (textit{i.e.} ▫$lambda_{text{in}}(T) proptolambda_{text{out}}(T) propto T^2$▫) or might be also reasonably welldescribed by the ▫$s$▫-wave model. Our results might reconcile the contradictory findings previously reported by different authors.
Ključne besede:solid state physics, organic superconductors, magnetic measurements
Leto izida:2002
UDK:539.2
COBISS_ID:7539478 Povezava se odpre v novem oknu
ISSN pri članku:1098-0121
NUK URN:URN:SI:UM:DK:XLSGEKUR
Število ogledov:927
Število prenosov:19
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Področja:Ostalo
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Gradivo je del revije

Naslov:Physical review
Skrajšan naslov:Phys. rev., B, Condens. matter mater. phys.
Založnik:The American Institute of Physics
ISSN:1098-0121
COBISS.SI-ID:14196519 Novo okno

Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:fizika trdne snovi, organski superprevodniki, magnetne meritve


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