Comparative study of organic metals and high-Tc cuprates (CROSBI ID 550005)
Prilog sa skupa u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Barišić, Slaven ; Barišić, Osor Slaven
engleski
Comparative study of organic metals and high-Tc cuprates
The Bechgaard salts and the high T$_c$ cuprates are described by two and three band models, respectively, with the lowest band (nearly) half filled. In organics the interactions are small, while in cuprates the repulsion $U_d$ on the Cu site is the largest energy. The Mott AF state is stable in undoped materials in both cases. In the metallic phase of cuprates the $U_d\rightarrow\infty$ limit produces a moderate effective repulsion. The theories of the coherent SDW and charge-transfer correlations in the metallic phases of organics and cuprates are thus similar. In (undoped) organics those correlations are associated with commensurate $2k_F$ SDW and $4k_F$ bond or site modes. The corresponding modes in metallic cuprates are the incommensurate SDW and in particular O$_x$/O$_y$ quadrupolar charge transfer with wave vector $2q_{; ; ; ; ; ; SDW}; ; ; ; ; ; =q_0+G$. They are enhanced for dopings $x>0$, which bring the Fermi level close to the van Hove singularity. Strong coupling to the lattice associates the static incommensurate O$_x$/O$_y$ charge transfer with collinear ``nematic'' stripes. In contrast to organics, the coherent correlations in cuprates compete with local $d_{; ; ; ; ; ; 10}; ; ; ; ; ; \leftrightarrow d_9$ quantum charge-transfer disorder.
Bechgaard salts ; high Tc cuprates ; metallic phase ; quantum charge-transfer disorder
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Podaci o prilogu
370-372.
2009.
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objavljeno
10.1016/j.physb.2008.11.025
Podaci o matičnoj publikaciji
Physica. B, Condensed matter
Brazovskii, Serguei ; Kirova, Natasha ; Monceau, Pierre
0921-4526
1873-2135
Podaci o skupu
Nepoznat skup
pozvano predavanje
29.02.1904-29.02.2096
Povezanost rada
Fizika