The Fermi Surfaces of ?-(BEDT-TTF)₂X

Computing the Properties of Materials from First Principles with SIESTA

“…In order to clarify the kind of warping, the region of k-space giving negative values of d/dc* is encoded as bright color and the region of k-space giving positive values is encoded as dark color. It is clear that the striped bands are inclined with respect to the c*-direction a feature which harmonizes with the results of the magnetoresistance reconstruction of the FS [226,227]. This study showed without any ambiguity that the FS of b-(BEDT-TTF) 2 IBr 2 does not contain any small closed pocket of carriers which could be at the origin of the slow oscillations.…”

“…The calculated transverse cross-section (Fig. 7b) is in excellent agreement with that reconstructed from the magnetoresistance data [226,227]. The cylinder-like FS is calculated to be warped as depicted in Fig.…”

Universality of the Mott–Ioffe–Regel limit in metals

“…As discussed in the previous section, the observation of quantum oscillations in both organic salts [Wosnitza et al 1996] and the ruthenates [Mackenzie 1996] makes the association of bad metallic behaviour with a non-FL ground state insupportable. Whilst bad metals are believed to be characterized by narrow conduction bands (W < 1eV), this is always not the case.…”

“…At first sight, this point of view appears rather compelling. Significantly however, quantum oscillatory phenomena of the FL form have now been observed both in organic salts [Wosnitza et al 1996] and two members of the ruthenate family, SrRuO 3 ] and Sr 2 RuO 4 [Mackenzie et al 1996], proving that a well-defined FL ground state is formed in (at least some of) these systems at low T. Evidence for a coherent, three-dimensional FL ground state has also been reported recently for highly doped cuprates [Proust et al 2003, Nakamae et al 2003]. Hence, the automatic association of a non-saturating ρ(T) with a non-FL ground state is inappropriate and some other physical explanation for the high-T resistivity is required.…”

Angle-dependent magnetoresistance of the layered organic superconductorκ−(ET)2Cu(NCS)Goddard1, Blundell2, Singleton3 et al. 2004Phys. Rev. B628760View full textAdd to dashboardCite

“…In that reference the authors assume that g * = 2 and that the mass obtained from the spin-zero effect is renormalised by electron-electron interactions, but not electron-phonon interactions, they then use the difference between this mass and that derived from a LifshitzKosevich analysis of quantum oscillations to specify the electron-phonon coupling constant [27]. However, as the g * µ * values obtained in this manner may not be renormalised in the same way as the effective masses found from the thermodynamic variation of the quantum oscillation amplitudes or the g-factors obtained from electron spin resonance it is not advisable to separate g * and µ * in this fashion.…”