Local-charge-density transfer and organic superconductivity: A positron study

Y. Lou; H. L. Yen; J. M. Wrobel; H. Zhang; Y. C. Jean; G. Saito; Z. J. Huang; C. W. Chu

doi:10.1103/PhysRevB.49.12255

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Local-charge-density transfer and organic superconductivity: A positron study

Y. Lou, H. L. Yen, J. M. Wrobel, H. Zhang, Y. C. Jean, G. Saito, Z. J. Huang, C. W. Chu

DOI 10.1103/PhysRevB.49.12255 · Physical Review B

T1

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Abstract

The temperature dependence between 4 and 294 K of the positron lifetime is measured in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2. The lifetime decreases rapidly with temperature from 350 to 343 ps below Tc, and increases monotonically above Tc to 372 ps. These experimental results are interpreted in terms of a transfer in the local charge density of organic superconductors associated with the superconducting transition. Theoretical positron density and positron-electron overlap distributions are calculated to support this interpretation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.6	Pressure not reported	unknown
(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.4	Pressure not reported	unknown
(BEDT-TTF)2Cu(N(CN)2)Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.6	Pressure not reported	unknown