Investigation of Vortex Behavior in the Organic Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mo>−</mml:mo><mml:mi>TTF</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:mi>SCN</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:m

Muon-spin rotation has been used to probe the vortex state in Sr 2 RuO 4 . At moderate fields and temperatures a lattice of triangular symmetry is observed, crossing over to a lattice of square symmetry with increasing field and temperature. At lower fields it is found that there are large regions of the sample that are completely free from vortices which grow in volume as the temperature falls. Importantly this is accompanied by increasing vortex density and increasing disorder within the vortex-cluster-containing regions. Both effects are expected to result from the strongly temperature-dependent long-range vortex attractive forces arising from the multiband chiral-order superconductivity.

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“…A useful way to parametrize the superconducting contributions to the line shapes is to calculate the quantity [28] …”

Section: Resultsmentioning

confidence: 99%

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

et al. 2014

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“…Initial muon-spin rotation (µSR) [107] studies of κ-phase BEDT-TTF salts gave inconclusive results because of the complex vortex dynamics; Reference [104] shows that earlier, apparently definitive statements about the nature of the superconductivity in BEDT-TTF salts are based on over-simplified analysis. Subsequently, more sophisticated analysis of the temperature dependence of µSR data appears to favour a superconducting gap with nodes [112].…”

Section: Penetration-depth Muon Spin Rotation and Thermal Conductivimentioning

confidence: 99%

“…Dimensional crossovers with the magnetic field applied perpendicular to the quasi-two-dimensional planes have been observed in artificial quasi-two-dimensional superconducting structures [157,158] and in organic superconductors such as κ-(BEDT-TTF) 2 Cu(NCS) 2 (see Figure 22) [104,154]; however, in the majority of these cases, the effect of the crossover is observed at magnetic fields less than H c2 . λ-(BETS) 2 GaCl 4 is perhaps unique in providing the correct anisotropy for the crossover to be observed in the behaviour of H c2 (T ).…”

Section: The Superconducting Phase Diagrammentioning

confidence: 99%

“…The vortex lattice in BEDT-TTF superconductors has been studied by µSR [104,112] and by flux decoration techniques [169]. Both types of experiment reveal a triangular flux-line lattice at the lowest fields, with the µSR data showing some evidence for a transition to a square lattice at higher fields and temperatures, just before the layers become decoupled (see Figure 24) [112].…”

Section: The Vortex Latticementioning

confidence: 99%

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Quasi-two-dimensional organic superconductors: A review

Singleton¹,

Mielke²

2002

Contemporary Physics

179

194

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Abstract. We present a review of quasi-two-dimensional organic superconductors. These systems exhibit many interesting phenomena, including reduced dimensionality, strong electron-electron and electron-phonon interactions and the proximity of antiferromagnetism, insulator states and superconductivity. Moreover, it has been possible to measure the electronic bands of many of the organics in great detail, in contrast to the situation in other well-known systems in which similar phenomena occur. We describe the crystal structure and normal-state properties of the organics, before presenting the experimental evidence for and against exotic superconductivity mediated by antiferromagnetic fluctuations. Finally, three instances of field-induced unconventional superconductivity will be described.

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“…Muon-spin spectroscopy 13 is a sensitive means of probing the superconductivity and local magnetism of molecular materials of this sort 14,15 . Transverse-field (TF) and longitudinal-field (LF) muon-spin relaxation (µ + SR) measurements were made on a mosaic sample of κ-(BEDT-TTF) 2 Cu[N(CN) 2 Br] at the ISIS facility, Rutherford Appleton Laboratory, UK and the Swiss Muon Source (SµS), Paul Scherrer Institut, CH.…”

Section: Methodsmentioning

confidence: 99%

Superconductivity and fluctuating magnetism in quasi-two-dimensionalκ-(BEDT-TTF)2Cu[N(CN)
Lancaster
¹
,
Blundell
²
,
Pratt
³

et al. 2011
Phys. Rev. B
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A muon-spin relaxation (µ + SR) investigation is presented for the molecular superconductor κ-(BEDT-TTF)2Cu[N(CN)2Br]. Evidence is found for low-temperature phase-separation, with only a fraction of the sample showing a superconducting signal, even for slow cooling. Rapid cooling reduces the superconducting fraction still further. For the superconducting phase, the in-plane penetration depth is measured to be λ = 0.47(1) µm and evidence is seen for a vortex decoupling transition in applied fields above 40 mT. The magnetic fluctuations in the normal state produce Korringa behavior of the muon spin relaxation rate below 100 K, a precipitous drop in relaxation rate is seen at higher temperatures and an enhanced local spin susceptibility occurs just above Tc.

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Investigation of Vortex Behavior in the Organic Superconductorκ−(BEDT−TTF)2Cu(SCN)2

Cited by 67 publications

References 16 publications

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

Quasi-two-dimensional organic superconductors: A review

Superconductivity and fluctuating magnetism in quasi-two-dimensionalκ-(BEDT-TTF)2Cu[N(CN)
Lancaster
¹
,
Blundell
²
,
Pratt
³

et al. 2011
Phys. Rev. B
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5
0
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Investigation of Vortex Behavior in the Organic Superconductorκ−(BEDT−TTF)2Cu(SCN)2

Cited by 67 publications

References 16 publications

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

Quasi-two-dimensional organic superconductors: A review

Superconductivity and fluctuating magnetism in quasi-two-dimensionalκ-(BEDT-TTF)2Cu[N(CN)Lancaster1, Blundell2, Pratt3 et al. 2011Phys. Rev. BSelf Cite6050View full textAdd to dashboardCite

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Superconductivity and fluctuating magnetism in quasi-two-dimensionalκ-(BEDT-TTF)2Cu[N(CN)
Lancaster
¹
,
Blundell
²
,
Pratt
³

et al. 2011
Phys. Rev. B
Self Cite
6
0
5
0
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