ISSN:
1572-9605
Keywords:
Organic superconductor
;
anisotropic superconductor
;
flux pinning
;
lower critical fieldH c1;κ-(BEDT-TTF)2Cu(NCS)2
;
κ-(BEDT-TTF)2Cu(NCS)2
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The magnetic torque ofκ-(BEDT-TFF)2Cu(NCS)2 was measured as a function of field directionθ with respect to thea *-axis under constant magnetic fields,H, up to 8 kOe in the temperature range from 1.3 to 8 K. A sharp cusp, C1, in the irreversible region was found atθ c1 near theH∥bc-plane between 1.3 and 7 K. In addition, extra cusps, C2 and C3, were observed atθ c2 andθ c3, respectively, between 2.5 and 6 K. At each temperature, the perpendicular component ofH giving each cusp is kept constant as $$H\cos \theta _{cn} = const \equiv H_{cp_n } (n = 1,2,3),$$ i.e., cusps C1, C2, and C3 are ruled by the characteristic field perpendicular to thebc-planeH cp1,H cp2, andH cp3, respectively. These behaviors are almost the same as those we found in the oxide superconductor Bi2Sr2CaCu2O8. These results suggest that the cusps are intrinsic for irreversible vortex states of these layered superconductors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00728484
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