Upper Critical Field of κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Cl under Magnetic Fields Parallel to the Superconducting Plane

Shimojo, Y.; Ishiguro, Takehiko; Yamochi, Hideki; Saito, Gunzi

doi:10.1143/jpsj.71.1716

Cited by 13 publications

(16 citation statements)

References 29 publications

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“…This agrees well with our concept, and one should expect that H c2 0 ( ) will exceed H p BCS under pressure P P < 0 , when the CDW is not completely destroyed. Such a behavior is similar to what has been revealed in k-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl [57]. On the other hand, the superconducting transitions become extremely broad at pressures below P 0 , demonstrating something like incomplete superconductivity [61], which is not covered by our theory [7,8].…”

Section: Discussionsupporting

confidence: 81%

“…kbar. In view of such a proximity between dielectric and superconducting phases, it seems quite possible that k-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl retains nesting properties of its FS for higher P. The observed positive curvature of H T c2 ( ) in the neighborhood of T c [57], a feature appropriate to superconductors with density waves [58], agrees with the assumption made. At the same time, at larger P = 6 kbar the critical temperature T c reaches a rather high value of 12.8 K [54].…”

Section: Discussionsupporting

confidence: 79%

“…Most probably, this behavior reflects the partial CDW-gapping [56]. The competition between CDW insulating state and superconductivity, triggered by an external pressure P in the related compound (BEDT-TTF) 3 [57]. It is remarkable that this substance is an insulator at ambient pressure but becomes metallic and superconducting for P > 0 3 .…”

Section: Discussionmentioning

confidence: 99%

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Paramagnetic effect of magnetic field on superconductors with charge-density waves

Ekino

Gabovich

Войтенко

2005

Low Temperature Physics

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The limiting field H p for spin-singlet superconductors with charge-density waves (CDWs), which paramagnetically destroys the ordered phase, possessing coexisting superconducting and CDW order parameters, is calculated self-consistently. It is shown that H p always exceeds the Pauli limits both for pure superconducting and pure CDW phases. Relevant experimental data for inorganic and organic superconductors with high upper critical magnetic fields are analyzed and are shown to be in qualitative agreement with the proposed theory.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 79%

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Paramagnetic effect of magnetic field on superconductors with charge-density waves

Ekino

Gabovich

Войтенко

2005

Low Temperature Physics

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“…Indeed, if we take experimental value of the perpendicular upper critical field, H ⊥ c2 5 T , we obtain the Ginzburg-Landau parallel coherence length ξ 0.8 × 10 −6 cm from the standard equation: Moreover, from Ref. [31], it follows that H c2 20 T and, using equation…”

mentioning

confidence: 98%

“…[27,28] is that the orbital effect is of the relative order of t 2 ⊥ /T 2 c0 1. From the experimental side, plenty of experimental works on Q2D organic and some other superconductors have been performed [29][30][31][32][33][34][35][36][37][38][39][40][41] to establish the possible existence of the FFLO phase in a parallel magnetic field.The goal of our paper is to consider the orbital effect in a parallel magnetic field in a Q2D conductor at zero temperature, in contrast to Refs. [27,28].…”

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confidence: 99%

Orbital effect for the Fulde-Ferrell-Larkin-Ovchinnikov phase in a quasi-two-dimensional superconductor in a parallel magnetic field

Lebed

2018

Phys. Rev. B

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We theoretically study the orbital destructive effect against superconductivity in a parallel magnetic field in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO or LOFF) phase at zero temperature in a quasi-two-dimensional (Q2D) conductor. We demonstrate that at zero temperature a special parameter, λ = l ⊥ (H )/d, is responsible for strength of the orbital effect, where l ⊥ (H ) is a typical "size" of the quasiclassical electron orbit in a magnetic field and d is the interplane distance. We discuss applications of our results to the existing experiments on the FFLO phase in the organic Q2D conductors κ-(ET) 2 Cu(NCS) 2 and κ-(ET) 2 Cu[N(CN) 2 ]Cl. DOI: 10.1103/PhysRevB.97.144504 It is well known that the orbital effect of electron motion in external magnetic field destroys superconductivity [1]. In singlet type-II superconductors, superconductivity is usually destroyed by magnetic fields higher than the so-called upper critical field, H c2 . For a 3D isotropic case, at zero temperature H c2 (0) was calculated in Ref.[2], whereas temperature dependence of the upper critical field, H c2 (T ), was found several years later [3]. As to triplet superconductivity, it can be restored in some cases in magnetic fields much higher than the H c2 (0), as theoretically predicted for quasi-one-dimensional (Q1D) [4,5], quasi-two-dimensional (Q2D) [6], and isotropic 3D [7] superconductors.Note that superconductivity in singlet superconductors can also be destroyed by spin effects, as was first demonstrated in Refs. [8,9] (i.e., above the so-called Clogston-Chandrasekhar paramagnetic limit, H P ). Nevertheless, Larkin, Ovchinnikov, Felde, and Ferrell (LOFF) stressed [10,11] that the situation with the above mentioned paramagnetic destruction of superconductivity is not so simple. Indeed, they showed that there might exist the FFLO (or LOFF) superconducting nonuniform phase in the restricted area of magnetic fields, H p < H < H FFLO . This happens when the orbital effect is small enough, which is realized in Q1D superconductors in an arbitrary oriented magnetic field and in Q2D superconductors for a magnetic field parallel to the conducting layers. As was shown in Ref.[12], the FFLO phase was stable in a pure 1D case for arbitrary strong magnetic field in the absence of the orbital effect. In Refs. [4,5,13,14], a possibility of the FFLO phase to exist in real Q1D materials from chemical family (TMTSF) 2 X (X = ClO 4 , PF 6 , etc.) was studied taking into account the orbital effect in a perpendicular magnetic field. In Ref. [15], it was shown that the FFLO phase has to exist in the Q1D superconductor (TMTSF) 2 ClO 4 , despite the orbital effect in a parallel magnetic field. Some important signatures of the possible existence of the FFLO phase were experimentally observed * Also at: L.D. Landau Institute for Theoretical Physics, RAS, 2 Kosygina Street, Moscow 117334, Russia. in perpendicular [16,17] and parallel [18,19] magnetic fields in the Q1D superconductors (TMTSF) 2 ClO 4 and (TMTSF) 2 PF 6 .As mentioned before, the second conve...

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One Dimensional Organic Superconductors

Jérôme

Pasquier

Frontiers in Superconducting Materials

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The new state of matter (superconductivity) has been discovered somehow unexpectedly in mercury with a critical temperature of T c = 4.15K by Kamerlingh Onnes in 1911 just after he had mastered the liquefaction of helium [1]. However, the phenomenon of superconductivity in particular its T c , is strongly dependent on the material in which it is to be observed. Therefore, over the years a lot of new metals and intermetallic compounds have been discovered with increased values of T c reaching a maximum which was apparently leveling off at about 24 K in the fifties, see figure 1. The absence of any satisfactory theory until 1957 did not prevent the applications of superconductivity which developed after World War Two but all these applications were bound to the use of liquid helium as the cooling agent which is necessary to stabilize the superconducting state. It is only in 1986 that totally new types of copper oxides discovered by Bednorz and Müller led to drastically higher T c [2]. This remarkable discovery was actually an outcome of the quest for new materials able to show superconductivity under conditions as close as possible to ambient temperature. As to the possibility of superconductivity in materials other than metals, F.London in 1937 had been the first to suggest that aromatic compounds under magnetic fields might exhibit a permanent current running along aromatic ring systems (anthracene, naphtalene,...) under magnetic field [3].

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Upper Critical Field of κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl under Magnetic Fields Parallel to the Superconducting Plane

Cited by 13 publications

References 29 publications

Paramagnetic effect of magnetic field on superconductors with charge-density waves

Paramagnetic effect of magnetic field on superconductors with charge-density waves

Orbital effect for the Fulde-Ferrell-Larkin-Ovchinnikov phase in a quasi-two-dimensional superconductor in a parallel magnetic field

One Dimensional Organic Superconductors

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Upper Critical Field of κ-(BEDT-TTF)2Cu[N(CN)2]Cl under Magnetic Fields Parallel to the Superconducting Plane

Cited by 13 publications

References 29 publications

Paramagnetic effect of magnetic field on superconductors with charge-density waves

Paramagnetic effect of magnetic field on superconductors with charge-density waves

Orbital effect for the Fulde-Ferrell-Larkin-Ovchinnikov phase in a quasi-two-dimensional superconductor in a parallel magnetic field

One Dimensional Organic Superconductors

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Product

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Upper Critical Field of κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl under Magnetic Fields Parallel to the Superconducting Plane