Influence of internal disorder on the superconducting state in the organic layered superconductor [kappa]-(BEDT-TTF)[sub]2Cu[N(CN)[sub]2]Br

Pinterić, Marko; Tomić, Silvija; Prester, Mladen; Drobac, Đuro; Maki, Kazumi

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Title:	Influence of internal disorder on the superconducting state in the organic layered superconductor [kappa]-(BEDT-TTF)[sub]2Cu[N(CN)[sub]2]Br
Authors:	ID Pinterić, Marko (Author) ID Tomić, Silvija (Author) ID Prester, Mladen (Author) ID Drobac, Đuro (Author) ID Maki, Kazumi (Author)
Files:	http://link.aps.org/abstract/PRB/v66/e174521
Language:	English
Work type:	Unknown
Typology:	1.01 - Original Scientific Article
Organization:	FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:	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.
Keywords:	solid state physics, organic superconductors, magnetic measurements
Year of publishing:	2002
PID:	20.500.12556/DKUM-27878
UDC:	539.2
ISSN on article:	1098-0121
COBISS.SI-ID:	7539478
NUK URN:	URN:SI:UM:DK:XLSGEKUR
Publication date in DKUM:	01.06.2012
Views:	2029
Downloads:	41
Metadata:
Categories:	Misc.
:	PINTERIĆ, Marko, TOMIĆ, Silvija, PRESTER, Mladen, DROBAC, Đuro and MAKI, Kazumi, 2002, Influence of internal disorder on the superconducting state in the organic layered superconductor [kappa]-(BEDT-TTF)[sub]2Cu[N(CN)[sub]2]Br. Physical review [online]. 2002. [Accessed 24 April 2025]. Retrieved from: http://link.aps.org/abstract/PRB/v66/e174521 Copy citation

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Record is a part of a journal

Title:	Physical review
Shortened title:	Phys. rev., B, Condens. matter mater. phys.
Publisher:	The American Institute of Physics
ISSN:	1098-0121
COBISS.SI-ID:	14196519

Secondary language

Language:	English
Keywords:	fizika trdne snovi, organski superprevodniki, magnetne meritve

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