13C double-bond 13C isotope effect for Tc and consequence regarding the superconducting pairing mechanism in κ-(ET)2X superconductors
Creators
- 1. Argonne National Lab., IL (United States)
- 2. Univ. of California, Irvine (United States)
- 3. Bio-Rad, Cambridge, MA (United States)
Description
In this communication, the authors report the first determination of the isotope effect for 13C substitution in the central C double-bond C atoms of ET [ET is bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)] in the organic superconductors κ-(ET)2Cu[N(CN)2]Br (Tc = 11.6 ± 0.05 K, diamagnetic onset) and κ-(ET)2Cu(NCS)2 (Tc = 9.8 ± 0.3 K, diamagnetic onset). These materials, presently the highest-Tc electron-donor-based, ambient-pressure organic superconductors, are much better materials for tests of the isotope effect for ET-based superconductors than pressurized β-(ET)2I3 because Tc is easily reproducible from sample-to-sample at ambient pressure. These results show that the central C double-bond C stretching motion is not a dominant exchange mechanism over conventional BCS-type phonon exchange for superconducting pairing in κ-(ET)2Cu[Nu(CN)2]Br and κ-(ET)2Cu(NCS)2
Additional details
Publishing Information
- Journal Title
- Inorganic Chemistry
- Journal Volume
- 31
- Journal Issue
- 16
- Journal Page Range
- p. 3346-3348.
- ISSN
- 0020-1669
- CODEN
- INOCAJ
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 24009774
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- AMINES; CARBON 13; COPPER COMPOUNDS; DOUBLE BONDS; EXPERIMENTAL DATA; HIGH-TC SUPERCONDUCTORS; ISOTOPE EFFECTS; ORGANIC SULFUR COMPOUNDS; SUPERCONDUCTIVITY
- Descriptors DEC
- CARBON ISOTOPES; CHEMICAL BONDS; DATA; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; EVEN-ODD NUCLEI; INFORMATION; ISOTOPES; LIGHT NUCLEI; NUCLEI; NUMERICAL DATA; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; STABLE ISOTOPES; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS