Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-03-13
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 3 eps figures
Scientific paper
10.1103/PhysRevB.62.2416
Many layered metals such as quasi-two-dimensional organic molecular crystals show properties consistent with a Fermi liquid description at low temperatures. The effective masses extracted from the temperature dependence of the magnetic oscillations observed in these materials are in the range, m^*_c/m_e \sim 1-7, suggesting that these systems are strongly correlated. However, the ratio m^*_c/m_e contains both the renormalization due to the electron-electron interaction and the periodic potential of the lattice. We show that for any quasi-two-dimensional band structure, the cyclotron mass is proportional to the density of states at the Fermi energy. Due to Luttinger's theorem, this result is also valid in the presence of interactions. We then evaluate m_c for several model band structures for the \beta, \kappa, and \theta families of (BEDT-TTF)_2X, where BEDT-TTF is bis-(ethylenedithia-tetrathiafulvalene) and X is an anion. We find that for \kappa-(BEDT-TTF)_2X, the cyclotron mass of the \beta-orbit, m^{*\beta}_c, is close to 2 m^{*\alpha}_c, where m^{*\alpha}_c is the effective mass of the \alpha- orbit. This result is fairly insensitive to the band structure details. For a wide range of materials we compare values of the cyclotron mass deduced from band structure calculations to values deduced from measurements of magnetic oscillations and the specific heat coefficient.
McKenzie Ross H.
Merino Jaime
No associations
LandOfFree
Cyclotron effective masses in layered metals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cyclotron effective masses in layered metals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cyclotron effective masses in layered metals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-148814