Physical phenomena in new organic conductors

Gor'kov, L.P.

doi:10.3367/ufnr.0144.198411b.0381

Cited by 26 publications

(9 citation statements)

References 15 publications

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“…We note that a similar growth was also observed for the critical temperature T N of the spin density wave (SDW) state [40][41][42]. Moreover, fieldinduced SDWs were predicted [40,[43][44][45] and observed for organic substances [46,47]. The situation for CDWs is more complicated, since in that case the magnetic field acts not only diamagnetically but also paramagnetically [25,26].…”

Section: Behaviour Of Cdw Metals In a Magnetic Fieldsupporting

confidence: 68%

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Gabovich

Pękała

et al. 2005

J. Phys.: Condens. Matter

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We consider tunnelling between a metal partially gapped by charge density waves (CDWM) and an ordinary metal (M) or a ferromagnet (FM) separated by an insulator (I) in an external magnetic field H. Zeeman paramagnetic splitting is assumed to dominate in the CDWM over orbital magnetic effects. The quasiparticle tunnel current J and relevant differential conductance G are calculated as functions of the bias voltage V. The peaks of G(V), originating from the electron density of states singularities near the charge density wave gap edges, were shown to be split in the magnetic field, each peak having a predominant spin polarization. This effect is analogous to the H-induced splitting of G(V) peaks obtained by Tedrow and Meservey for junctions between normal metals and superconductors (S). Thus, it is possible to electrically measure the polarization of current carriers in such a set-up, although the behaviours of G(V) in the two cases are substantially different. The use of M–I–CDWM junctions instead of M–I–S ones has certain advantages. The absence of the Meissner effect, which weakens the constraints upon the junction geometry and electrode materials, comprises the main benefit. The other advantage is the larger energy range of the charge density wave gaps in comparison to that for superconductors’ gaps, so that larger Hs may be applied.

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Section: Behaviour Of Cdw Metals In a Magnetic Fieldsupporting

confidence: 68%

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Gabovich

Pękała

et al. 2005

J. Phys.: Condens. Matter

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“…The degeneracy of the electron spectrum in the b direction is a specific manifestation of the Landau degeneracy in a magnetic field in the case of a 2D system with a strong Q1D anisotropy. This phenomenon is called "one-dimensionalization" of a Q1D system by a magnetic field [11]. Even though the spectrum of electrons becomes 1D and their wave functions become localized in the b direction, the wave functions still spread over many chains (if E H ≪ t b ), which results in a considerable interaction between different chains [31].…”

Section: Heuristic Theoretical Picturementioning

confidence: 99%

“…The (TMTSF) 2 X materials consist of one-dimensional (1D) conducting chains parallel to the crystal axis a (for general reviews of the (TMTSF) 2 X materials, see Refs. [1,[9][10][11][12]). The chains are weakly coupled in the two others directions b and c, the coupling in the c direction being much weaker than in the b direction.…”

Section: Experimental Introductionmentioning

confidence: 99%

Anomalous temperature dependence of resistivity in quasi-one-dimensional conductors in a strong magnetic field

Zheleznyak

Yakovenko

1999

Eur. Phys. J. B

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We present a heuristic, semiphenomenological model of the anomalous temperature (T) dependence of resistivity ρ xx recently observed experimentally in the quasi-one-dimensional (Q1D) organic conductors of the (TMTSF) 2 X family in moderately strong magnetic fields. We suggest that a Q1D conductor behaves like an insulator (dρ xx /dT < 0), when its effective dimensionality is one, and like a metal (dρ xx /dT > 0), when its effective dimensionality is greater than one. Applying a magnetic field reduces the effective dimensionality of the system and switches the temperature dependence of resistivity between the insulating and metallic laws depending on the magnitude and orientation of the magnetic field. We critically analyze whether various microscopic models suggested in literature can produce such a behavior and find that none of the models is fully satisfactory. In particular, we perform detailed analytical and numerical calculations within the scenario of magneticfield-induced spin-density-wave precursor effect suggested by Gor'kov and find that the theoretical results do not agree with the experimental observations. 72.10. 72.15.Gd, 75.30.Fv, 74.70.Kn Typeset using REVT E X

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“…It is important to understand whether the electron-hole gapping is detrimental or favorable to the SC state formation. The opening of a partial dielectric gap has been shown to cause destructive effects on Cooper pairing [1][2][3] and, consequently, a direct way to enhance the superconducting (SC) transition temperature, T c , would be to avoid the CDW formation. The model of partial gapping [4,5] explains many of the characteristic features observed experimentally in CDW superconductors.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and charge density wave formation in Tl_xV₆S₈

Hochheimer¹,

Martin²,

Miclea³

et al. 2013

New J. Phys.

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We report on specific heat and resistivity measurements under hydrostatic pressure on the quasi-one dimensional metal Tl x V 6 S 8 . We studied the interplay between the low temperature superconducting (SC) ground state and a high temperature charge density wave (CDW) instability. We observed a clear dependency of the physical properties of Tl x V 6 S 8 on the Tl concentration x. The CDW anomaly is present in all investigated samples that are strongly enhanced at half Tl filling, x = 0.47. This is also the only composition for which no signature of superconductivity is observed. The specific heat results regarding the SC phase in Tl 0.63 V 6 S 8 suggest that this compound is a highly anisotropic, weak coupling superconductor. Pressure suppresses both SC and CDW transitions to lower temperatures. Nevertheless, as the CDW gap is closed at a critical pressure p c , the increase in the density of states leads to a small enhancement of T c suggesting that SC and CDW compete for parts of the Fermi-surface.

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Physical phenomena in new organic conductors

Cited by 26 publications

References 15 publications

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Anomalous temperature dependence of resistivity in quasi-one-dimensional conductors in a strong magnetic field

Superconductivity and charge density wave formation in Tl_xV₆S₈

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Physical phenomena in new organic conductors

Cited by 26 publications

References 15 publications

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Paramagnetic spin splitting of the conductances for tunnel junctions between partially gapped metals with charge density waves and normal metals or ferromagnets

Anomalous temperature dependence of resistivity in quasi-one-dimensional conductors in a strong magnetic field

Superconductivity and charge density wave formation in TlxV6S8

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Product

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Superconductivity and charge density wave formation in Tl_xV₆S₈