TY - JOUR
T1 - Mechanism of superconductivity in organic metals
AU - Weger, M.
AU - Pitaevskii, L.
AU - Peter, M.
PY - 1997/3/15
Y1 - 1997/3/15
N2 - The "fundamental" mechanism of superconductivity in organic metals has been a mystery for a long time. Various mechanisms, such as interactions mediated by excitons, internal phonons, or paramagnons have been proposed. We performed a calculation for the phonon-mediated BCS model, under conditions of very strong coupling, with external phonons (such as librons). We find that the large ionic dielectric constant (ε0≈20) has a profound effect, increasing Tc by about an order of magnitude, by its effect on the electron-phonon matrix element. We find for a 2D metal a maximum Tc of approximately (Tc)max≈0.1(e2/2ac)√2m/M where 2ac is the length of the "metallic" portion of the molecule, m the electronic band mass, and M the ionic mass. Detailed behavior of the sc tunneling, and resistivity in the normal state, are in full accord with this theory.
AB - The "fundamental" mechanism of superconductivity in organic metals has been a mystery for a long time. Various mechanisms, such as interactions mediated by excitons, internal phonons, or paramagnons have been proposed. We performed a calculation for the phonon-mediated BCS model, under conditions of very strong coupling, with external phonons (such as librons). We find that the large ionic dielectric constant (ε0≈20) has a profound effect, increasing Tc by about an order of magnitude, by its effect on the electron-phonon matrix element. We find for a 2D metal a maximum Tc of approximately (Tc)max≈0.1(e2/2ac)√2m/M where 2ac is the length of the "metallic" portion of the molecule, m the electronic band mass, and M the ionic mass. Detailed behavior of the sc tunneling, and resistivity in the normal state, are in full accord with this theory.
KW - High-T cuprates
KW - Organic superconductors
KW - Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=0031071532&partnerID=8YFLogxK
U2 - 10.1016/s0379-6779(97)80374-8
DO - 10.1016/s0379-6779(97)80374-8
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AN - SCOPUS:0031071532
SN - 0379-6779
VL - 85
SP - 1623
EP - 1625
JO - Synthetic Metals
JF - Synthetic Metals
IS - 1-3
ER -