Tetramethyltetraselenafulvalenium Perchlorate,(TMTSF)2ClO4

Quantum limit in a magnetic field for triplet superconductivity in a quasi-one-dimensional conductor

“…Rp, 74.70.Kn, 74.25.Op High magnetic field properties of quasi-onedimensional (Q1D) conductors and superconductors have been intensively studied since the discovery of the Field-Induced Spin-Density-Wave (FISDW) cascade of phase transitions [1][2][3][4]. Note that the FISDW phenomenon, experimentally discovered in the (TMTSF) 2 X compounds [1,2], where X=ClO 4 and X=PF 6 , was historically the first one which was successfully explained in terms of quasi-classical 3D → 2D dimensional crossover in high magnetic fields [3,[5][6][7]. At present, it has been established that different kinds of quasi-classical dimensional crossovers in a magnetic field are responsible for such unusual phenomena in layered Q1D conductors as the Field-Induced Charge-Density-Wave (FICDW) phase transitions [3,5,8,9], Danner-Kang-Chaikin oscillations [3,10], Lebed Magic Angles [3,11,12], and Lee-NaughtonLebed oscillations [3,[13][14][15][16].…”

“…Rp, 74.70.Kn, 74.25.Op High magnetic field properties of quasi-onedimensional (Q1D) conductors and superconductors have been intensively studied since the discovery of the Field-Induced Spin-Density-Wave (FISDW) cascade of phase transitions [1][2][3][4]. Note that the FISDW phenomenon, experimentally discovered in the (TMTSF) 2 X compounds [1,2], where X=ClO 4 and X=PF 6 , was historically the first one which was successfully explained in terms of quasi-classical 3D → 2D dimensional crossover in high magnetic fields [3,[5][6][7].…”

On a Field-Induced Spin-Density Wave in Bechgaard Salts

“…[4] and [10] for tc = 1 meV, which coincides with the result of the band stucture calculations, and λ 0 = 8 T; for these values Tc = 3 K for H = 10 T. Using λ 0 given below (14) we obtain a coupling strength of our model λ = 103 eV.Å3 . For H = 10 T we also find from (9) that the highest occupied band has l= 350, and the width of the region over which the critical temperature is non-vanishing is ~0.3 kOe (neΦ0d ~ 7 x 103 T ) .…”

“…As it is well known, the critical temperature is given in this case by Tc = 1.13ΔEexp(-1/λg), where g is the density of states (10) and ΔE is the bandwidth. Similarly, the gap parameter is provided by Δ = 1.78T…”

“…It includes Shubnikov-de Haas oscillations in the magnetoresistance [7], NMR magnetization [8], Hall-type effect [9,10], and field-dependent anomalies in the electronic specific heat [11]. The information gathered from such pieces of evidence has led to the suggestion that closed electronic orbits may exist in the α*, b*-plane in the presence of the magnetic field, and that a SDW may survive (providing the pressure is not very high) below 10 K and for certain values of the magnetic field above a threshold value of ~ 2-3 T.…”