Low-Field Superconducting Phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:mi>TMTSF</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>ClO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Pratt, F. L.; Lancaster, Tom; Blundell, Stephen J.; Baines, C.

doi:10.1103/physrevlett.110.107005

Cited by 25 publications

(25 citation statements)

References 51 publications

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“…ρ s (T ) can be well described within the single-gap BCS s-wave scenario with (0) = 1.07(4) meV. The magnetic penetration depth was estimated to λ(0) = 785(20) nm, which is significantly large but consistent with the λ(0) values of other low-dimensional superconductors [38][39][40][41][42][43]. For layered superconductors, such as cuprates [44] and iron chalcogenides [45], it has been observed in the past that the penetration depth increases with increasing layer separation, i.e., when the superfluid density goes from 3D to 2D nature.…”

supporting

confidence: 65%

Nodeless superconductivity in quasi-one-dimensionalNb2PdS5: AμSRstudy

Biswas⃰¹,

Luetkens²,

Xu³

et al. 2015

Phys. Rev. B

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Muon spin relaxation and rotation (μSR) measurements have been performed to study the superconducting and magnetic properties of Nb 2 PdS 5 . Zero-field μSR data show that no sizable spontaneous magnetization arises with the onset of superconductivity in Nb 2 PdS 5 , which indicates that the time-reversal symmetry is probably preserved in the superconducting state of this system. A strong diamagnetic shift is observed in the transverse-field μSR data practically ruling out a dominant triplet-pairing superconducting state in Nb 2 PdS 5 . The temperature dependence of magnetic penetration depth evidences the existence of a single s-wave energy gap (0) with a gap value of 1.07(4) meV at zero temperature. The ratio (0)/k B T c = 2.02(9) indicates that Nb 2 PdS 5 should be considered as a moderately strong-coupling superconductor. The magnetic penetration depth at zero temperature is 785(20) nm, indicating a very low superfluid density consistent with the quasi-one-dimensional nature of this system.

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supporting

confidence: 65%

Nodeless superconductivity in quasi-one-dimensionalNb2PdS5: AμSRstudy

Biswas⃰¹,

Luetkens²,

Xu³

et al. 2015

Phys. Rev. B

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“…The engineering of conducting states at the interface of oxide [2] and organic materials [3] has demonstrated the ability to produce new types of 2-dimensional (2D) conducting systems with novel properties. Parallel to this, systems that host naturally occurring lower-dimensional electron systems supported by a highly anisotropic structures have also shown promise for realizing such states, including p-wave superconductivity [4] and spin liquid [5]. Particularly regarding these naturally anisotropic materials, the vital question remains of to what extent such low-dimensional electronic systems are accessible to measurement and utilization and how those dimensional changes modify electronic structure.…”

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confidence: 98%

Observation of Orbital Resonance Hall Effect in(TMTSF)2ClO4

et al. 2014

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We report the observation of a Hall effect driven by orbital resonance in the quasi-1-dimensional (q1D) organic conductor (TMTSF)2ClO4. Although a conventional Hall effect is not expected in this class of materials due to their reduced dimensionality, we observed a prominent Hall response at certain orientations of the magnetic field B corresponding to lattice vectors of the constituent molecular chains, known as the magic angles (MAs). We show that this Hall effect can be understood as the response of conducting planes generated by an effective locking of the orbital motion of the charge carriers to the MA driven by an electron-trajectory resonance. This phenomenon supports a class of theories describing the rich behavior of MA phenomena in q1D materials based on altered dimensionality. Furthermore, we observed that the effective carrier density of the conducting planes is exponentially suppressed in large B, which indicates possible density wave formation.

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“…Since the combination of spin interchange, parity, and relative time reversal has to be odd for a pair of electrons, the found odd-frequency gap symmetries are either both even under spin and even under parity or odd under spin and odd under parity.Consequently, for an experimental identification of the symmetry of a bulk superconducting gap in simple single-band systems, it is required to measure at least two of the three above mentioned information, e.g., as performed in Ref. [34]. Even though signals for the experimental verification of odd-frequency states are often discussed in connection to systems which explicitly break time-reversal symmetry [31][32][33], our paper reveals that odd-frequency solutions do not require a time-reversal breaking potential.…”

Section: Resultsmentioning

confidence: 99%

“…Also, odd-frequency states were discussed in connection to time-reversal topological superconductivity in double Rashba wires, where it was found that odd-frequency pairing is strongly enhanced in the topological state [30]. For some of the above mentioned systems, the respective signatures of odd-frequency correlations could also be verified experimentally [31][32][33][34]. An extensive discussion of edge-states and topology in superconductors including odd-frequency gap functions was communicated by Tanaka, Sato and Nagaosa [35].…”

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confidence: 99%

Symmetry analysis of odd- and even-frequency superconducting gap symmetries for time-reversal symmetric interactions

Geilhufe

Balatsky

2018

Phys. Rev. B

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Odd-frequency superconductivity describes a class of superconducting states where the superconducting gap is an odd function in relative time and Matsubara frequency. We present a group theoretical analysis based on the linearized gap equation in terms of Shubnikov groups of the second kind. By discussing systems with spin-orbit coupling and an interaction kernel which is symmetric under the reversal of relative time, we show that both even-and odd-frequency gaps are allowed to occur. Specific examples are discussed for the square lattice, the octahedral lattice, and the tetragonal lattice. For irreducible representations that are even under reversal of relative time the common combinations of s-and d-wave spin singlet and p-wave spin triplet gaps are revealed, irreducible representations that are odd under reversal of relative time give rise to s-and d-wave spin triplet and p-wave spin singlet gaps. Furthermore, we discuss the construction of a generalized GinzburgLandau theory in terms of the associated irreducible representations. The result complements the established classification of superconducting states of matter. [7]; and the organic superconductors like the BEDT-TTF-based charge transfer salts [8][9][10][11][12] exhibit symmetries of the superconducting gap beyond the conventional BCS s-wave [13]. In this connection, a group theory analysis based on the underlying symmetry of the pairing potential is crucial in establishing an unified classification of the arising superconducting states of matter [14][15][16][17][18][19]. In general, the pairing wave function of two electrons has to be anti-symmetric under particle interchange leading to the Pauli-principle. At equal times, and by neglecting orbital degrees of freedom two cases can occur: first, a gap odd in spin and even in parity, such as spin singlet s-and d-wave gaps, and, second, a gap even in spin and odd in parity, such as spin triplet p-and f -wave gaps.However, as pointed out by Berezinskii [20] and Balatsky and Abrahams [21] a pairing of particles beyond the conventional ones is possible, if the particle-particle correlator is zero at equal times but non-zero otherwise. This is achieved when the superconducting gap is an odd function in relative time, leading to the notion of odd-time or odd-frequency superconductivity, respectively (odd-frequency also refers to gap functions odd in Matsubara frequency). Among others, odd-frequency contributions were reported to occur in connection to diffusive ferromagnet/superconductor junctions [22,23] [28,29]. Also, odd-frequency states were discussed in connection to time-reversal topological superconductivity in double Rashba wires, where it was found that odd-frequency pairing is strongly enhanced in the topological state [30]. For some of the above mentioned systems, the respective signatures of odd-frequency correlations could also be verified experimentally [31][32][33][34]. An extensive discussion of edge-states and topology in superconductors including odd-frequency gap functions was communicat...

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Low-Field Superconducting Phase of(TMTSF)2ClO4

Cited by 25 publications

References 51 publications

Nodeless superconductivity in quasi-one-dimensionalNb2PdS5: AμSRstudy

Nodeless superconductivity in quasi-one-dimensionalNb2PdS5: AμSRstudy

Observation of Orbital Resonance Hall Effect in(TMTSF)2ClO4

Symmetry analysis of odd- and even-frequency superconducting gap symmetries for time-reversal symmetric interactions

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