Journal
PHYSICA B-CONDENSED MATTER
Volume 328, Issue 1-2, Pages 23-25Publisher
ELSEVIER
DOI: 10.1016/S0921-4526(02)01801-X
Keywords
superconductivity; tunneling; break junction; energy gap; MgB2; Li-x(THF)(y)HfNCl
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Break-junction tunneling spectra have been measured on MgB2 and Li-0.5(THF)(y) HfNCl to investigate the nature,of the superconducting gap. The observed largest gap values at 4 K are 2Delta = 18-20 and 11-12 meV for MgB2 (T-c = 39 K) and Li-0.5(THF)(y)HfNCl (26 K), respectively. These values lead to the similar ratio 2Delta/k(B)T(c) = 5-6, which is extremely large in comparison with that of the conventional strong-coupling superconductors. (C) 2002 Elsevier Science B.V. All rights reserved.
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