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Anomalous Pressure Dependences of the Superconducting Transition Temperature of Graphite Intercalation Compounds

Published online by Cambridge University Press:  15 February 2011

L.E. Delong ,
V. Yeh ,
V. Tondiglia ,
P.C. Eklund ,
S.E. Lambert  and
M.B. Maple
L.E. Delong
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA,
V. Yeh
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA,
V. Tondiglia
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA,
P.C. Eklund
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA,
S.E. Lambert
Affiliation:
Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA.
M.B. Maple
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA,
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Abstract

Measurements of the pressure (P) dependence of the superconducting transition temperature Tc of KHgC4, KHgC8, KTℓ1.5C4 and KC8 are reported. KC24 was found to be nonsuperconducting to a limiting temperature T ≈ 0.07 K for P ≤ 10 kbar, and RbC8 was found to be nonsuperconducting to T ≈ 1.30 K for P ≤ 22 kbar. The Tc of KHgC8 was found to monotonically decrease at a rate dTc/dP = −6.5 × 10−5 K/bar from a zero pressure Tc = 1.850 K. The Tc of KTℓ1.5C4 initially decreases at a rate dTc/dP≤ −4.5 × 10−5 K/bar from a zero pressure Tc = 2.54 K. KHgC4 displayed a broad zero pressure superconducting transition with an onset at T ≈ 1.42 K, followed by an abrupt narrowing of the transition and rapid decrease of Tc at a rate dTc/dP = −5 × 10−5 K/bar at p > 1 kbar. The Tc of KC8 was observed to jump from a zero pressure value of 0.13 K to a broad transition with an onset at ˜ 1.7 K for P > 2 kbar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 195
Copyright
Copyright © Materials Research Society 1983

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References

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