Naslov
Comparative study of organic metals and high-Tc cuprates

Autori
Barišić, Slaven ; Barišić, Osor Slaven

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Workshop on Electronic Crystals(ECRYS 2008), in Physica B: Condensed Matter / Brazovskii, Serguei ; Kirova, Natasha ; Monceau, Pierre - , 2009, 370-372

Skup
International Workshop on Electronic Crystals (ECRYS 2008)

Mjesto i datum
Cargèse, Francuska, 24.08.2008. - 30.08.2008

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Bechgaard salts ; high Tc cuprates ; metallic phase ; quantum charge-transfer disorder

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA