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Oh, Jeong Il; Naughton, Michael

doi:10.1103/physrevlett.92.067001

Cited by 89 publications

(105 citation statements)

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“…32) In (TMTSF) 2 ClO 4 , Oh et al found that H c2 exceeds H P at low temperatures. 33) Recently, Yonezawa et al discovered a shift in the principal axis of the in-plane field-angle dependence of the superconducting onset temperature, which may be related to the FFLO state. In this system, a singlet state with line nodes (the so-called d-wave state) is considered to be likely.…”

Section: Introductionmentioning

confidence: 99%

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

Miyawaki

Seki

2014

J. Phys. Soc. Jpn.

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The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is examined in quasi-one-dimensional s-wave and d-wave superconductors with particular attention paid to the effect of the Fermi-surface anisotropy. The upper critical field H c2 (T ) is found to exhibit a qualitatively different behavior depending on the ratio of the hopping energies t b /t a and the direction of the FFLO modulation vector q, where t a and t b are the intra-and interchain hopping energies, respectively. In particular, when t b /t a < ∼ 0.1 and q a, we find a novel dimensional crossover of H c2 (T ) from one dimension to two dimensions, where a is the lattice vector of the most conductive chain. Just below the tricritical temperature T * , the upper critical field H c2 (T ) increases steeply as in one-dimensional systems, but when the temperature decreases, the rate of increase in H c2 (T ) diminishes and a shoulder appears. Near T = 0, H c2 (T ) shows a behavior typical of the FFLO state in two-dimensional systems, i.e., an upturn with a finite field at T = 0. When the angle between q and a is large, the upper critical field curve is convex upward at low temperatures, as in three-dimensional systems, but the magnitude is much larger than that of a three-dimensional isotropic system. For t b /t a > ∼ 0.15, the upper critical fields exhibit a two-dimensional behavior, except for a slight shoulder in the range of 0.2 > ∼ t b /t a > ∼ 0.15. The upper critical field is maximum for q a both for s-wave and d-wave pairings, while it is only slightly larger than the Pauli paramagnetic limit for q ⊥ a. The relevance of the present results to the organic superconductor (TMTSF) 2 ClO 4 is discussed.

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Section: Introductionmentioning

confidence: 99%

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

Miyawaki

Seki

2014

J. Phys. Soc. Jpn.

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“…(12). If we do this and if we introduce more convenient variables, y = y, y 1 = y + vy (py) vF z, we can rewrite Eq.…”

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confidence: 99%

“…Our analysis of Eq. (12) shows that the RS phase may appear only at magnetic fields of the order of 50 T , where superconductivity is already destroyed by the paramagnetic spin-splitting effects. Therefore, for a magnetic field parallel to the conducting axis, H a, unlike the situation, where it is perpendicular to it, H b ′ [18][19][20][21][22][23], we can ignore the above mentioned RS effects.…”

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confidence: 99%

“…Note that in (TMTSF) 2 PF 6 superconductor H b ′ c2 is very large [10,11] due to a formation of domain walls in the vicinity of antiferromagnetic phase. In contrast, in (TMTSF) 2 ClO 4 conductor large upper critical field H b ′ c2 [12][13][14] is prescribed to 3D → 2D dimensional crossover in a magnetic field, predicted in Ref. [18] and elaborated in Refs.…”

mentioning

confidence: 99%

“…Another unconventional feature of superconductivity in (TMTSF) 2 X conductors is very large upper critical fields for a magnetic field parallel to their conducting planes and perpendicular to their conducting chains, H b ′ [9][10][11][12][13][14]. These fields exceed both the quasi-classical orbital upper critical field [15,16] and so-called Clogston paramagnetic limit [17].…”

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Column density and temperature effects on narrow resonance structures in atomic photoionization and photoabsorption

Yih

Luo

et al. 2010

Phys. Rev. A

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We consider a formation of the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase in a quasi-onedimensional (Q1D) conductor in a magnetic field, parallel to its conducting chains, where we take into account both the paramagnetic spin-splitting and orbital destructive effects against superconductivity. We show that, due to a relative weakness of the orbital effects in a Q1D case, the LOFF phase appears in (TMTSF)2ClO4 superconductor for real values of its Q1D band parameters. We compare our theoretical calculations with the recent experimental data by Y. Maeno's group [S. Yonezawa et al., Phys. Rev. Lett. 100, 117002 (2008)] and show that there is a good qualitative and quantitative agreement between the theory and experimental data.PACS numbers: 74.70. Kn, 74.20.Rp, 74.25.Op Since a discovery of superconductivity in organic (TMTSF) 2 X conductors (X=PF 6 and ClO 4 ) [1], their physical properties have been intensively studied both experimentally and theoretically [2,3]. From the beginning, it was clear that their superconducting properties were unconventional. Indeed, it was found [4] that superconductivity was destroyed by non-magnetic impurities, which was recently unequivocally confirmed [5]. In addition, it was shown [6] that the conventional for s-wave superconductivity Hebel-Slichter peak was absent in the NMR experiments. Note that the experimental results [4][5][6] provide strong arguments that superconducting order parameter changes its sign on a quasi-one-dimensional (Q1D) Fermi surface (FS) of (TMTSF) 2 X superconductors. On the other hand, they do not contain information about a spin-part of a superconducting order parameter and, thus, do not distinguish between singlet and triplet pairings. At the moment, the problem about a spin part of a superconducting order parameter in (TMTSF) 2 X conductors is still controversial. Indeed, early measurements of the Knight shift in (TMTSF) 2 PF 6 conductor [7] in a magnetic field H = 1.43 T showed that spin susceptibility was unchanged through the superconducting transition. These data were interpreted as an evidence for triplet superconductivity. On the other hand, more recent Knight shift data in (TMTSF) 2 ClO 4 conductor [8], obtained in a magnetic field H = 0.957 T , were interpreted in favor of a singlet superconducting pairing.Another unconventional feature of superconductivity in (TMTSF) 2 X conductors is very large upper critical fields for a magnetic field parallel to their conducting planes and perpendicular to their conducting chains, H b ′ [9-14]. These fields exceed both the quasi-classical orbital upper critical field [15,16] and so-called Clogston paramagnetic limit [17]. Note that in (TMTSF) 2 PF 6 superconductor H b ′ c2 is very large [10,11] due to a formation of domain walls in the vicinity of antiferromagnetic phase. In contrast, in (TMTSF) 2 ClO 4 conductor large upper critical field H b ′ c2 [12-14] is prescribed to 3D → 2D dimensional crossover in a magnetic field, predicted in Ref. [18] and elaborated in Refs. [19][20][21][22][23]. In addi...

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Organic Superconductors

Jacobsen

2009

Digital Encyclopedia of Applied Physics

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The old dream of organic superconductivity was finally realized in 1980, but hopes for high transition temperatures have not been fulfilled as yet. We review the phenomenon of superconductivity and the present understanding of the microscopic theory with emphasis on molecular conductors. The historical development is briefly described. We discuss how the common approach to making molecular conductors almost invariably leads to materials that are highly anisotropic, in some cases even quasi‐one‐dimensional. Quasi‐one‐dimensional conductors are susceptible to various instabilities and up till now superconductivity has only been found in two groups of related materials with a maximum superconducting temperature around 12 K. The structure and the physical properties of the materials are presented in relation to the occurrence of superconductivity.

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Magnetic Determination ofHc2under Accurate Alignment in(TMTS

Cited by 89 publications

References 23 publications

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

Column density and temperature effects on narrow resonance structures in atomic photoionization and photoabsorption

Organic Superconductors

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