Angular dependence of the cyclotron effective mass in organic superconductors

Abstract

We report measurements of the de Haas-van Alphen (dHvA) effect in the organic superconductors a-(BEDT-TTF) 2 (NH 4 )Hg(SCN) 4 (T c ~ 1 K) and K-(BEDT-TTF) 2 CU(NCS) 2 (7V«10 K) in fields up to 15 T and temperatures down to 0.45 K. For the first time, we determine the angular dependence of the cyclotron effective mass m c , and the orientation of up to four spin-splitting zeros of the dHvA signal. The angular dependence of the amplitude of the dHvA oscillations is quantitatively explained, and the mass enhancement due to electron-phonon coupling is estimated.

Pressure dependence of the magnetic penetration depth inκ−(BEDT−TTF)2Cu(NCSLarkin1, Kinkhabwala2, Uemura3 et al. 2001Phys. Rev. B140160View full textAdd to dashboardCite

“…26 Since the present system has a very long mean free path l ϳ1000 Å at TϳT c , as inferred from quantum oscillation studies, 34 and since we can expect that l becomes even longer in the superconducting state at T→0, the in-plane transport of this system lies well within the clean limit (l ӷ). Thus, we cannot ascribe the difference between n s /m* and n n /m* to impurity scattering.…”

Quantum Magneto-Oscillations in a Supramolecular Mn(II)-[3×3] Grid

“…The magnetic grid molecule Mn(II)- [3 × 3] has been studied by high-field torque magnetometry at 3 He temperatures. At fields above 5 T, the torque vs. field curves exhibit an unprecedented oscillatory behavior.…”

“…Currently, it finds application in a wide range of materials, e.g. heavy fermion compounds [2], low-dimensional organic metals [3], hightemperature superconductors [4], two-dimensional electron gases [5], or in the recently discovered superconductor MgB 2 [6].…”

“…Currently, it finds application in a wide range of materials, e.g. heavy fermion compounds [2], low-dimensional organic metals [3], hightemperature superconductors [4], two-dimensional electron gases [5], or in the recently discovered superconductor MgB 2 [6].In this work, we report on a new magnetooscillatory effect, discovered in the molecular nanomagnet [Mn 9 (2POAP-2H) 6 ](ClO 4 ) 6 · 3.57 MeCN · H 2 O, the so called Mn-[3 × 3] grid. Molecular nanomagnets are compounds with many magnetic metal ions linked by organic ligands to form well defined magnetic nanoclusters.…”

The influence of the chemical potential oscillations on the de Haas-van Alphen effect in quasi-two-dimensional compounds

“…Hence, the estimate of the effective electron mass based on the L-K formula may lead to the errors up to 30%. This can be an explanation of the difference of the effective electron masses obtained from the dHvA effect and cyclotron resonance measurements (for example, in [10] and [11]). This problem was examined numerically by N. Harrison et al [12] at zero warping W of Fermi surface(FS).…”