Unconventional density wave as possible explanation of the Nernst signal in CeCoIn<sub>5</sub>

Dóra, Balázs; Maki, Kazumi; Virosztek, Attila; Ványolos, András

doi:10.1002/pssb.200460035

Cited by 3 publications

(3 citation statements)

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“…A similar expression has been obtained in [54]. The giant Nernst effect in the pseudogap phase of the high-T c cuprates and CeCoIn 5 has already been discussed in [46,47,56]. In conclusion, ADMR, the non-linear Hall conductivity and the giant Nernst effect should provide a clear signature of UDW.…”

Section: Landau Quantizationsupporting

confidence: 74%

“…In addition d-wave density wave in the pseudogap phase appears to be an additional common feature [41,42,46,47]. In the absence of a magnetic field the Nambu Green function for dDW is given by [41] …”

Section: D-wave Density Wavesmentioning

confidence: 99%

“…There are many parallels between the cuprates, the heavy-fermion superconductor CeCoIn 5 and the organic conductor κ-(ET) 2 Cu(NCS) 2 : the quasi-two dimensional Fermi surface, the proximity of the antiferromagnetic phase and d-wave superconductivity [22,45]. In addition d-wave density wave in the pseudogap phase appears to be an additional common feature [41,42,46,47]. In the absence of a magnetic field the Nambu Green function for dDW is given by [41]…”

Section: D-wave Density Wavesmentioning

confidence: 99%

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Gossamer superconductivity, new paradigm?

Won¹,

Haas

Maki

et al. 2005

Physica Status Solidi (b)

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Key words cuprate, d-wave superconductivity, d-wave density wave PACS 74.70.-b We shall review our recent works on d-wave density wave (dDW) and gossamer superconductivity (i.e. dwave superconductivity in the presence of dDW) in high-Tc cuprates and CeCoIn5. a) We show that both the giant Nernst effect and the angle dependent magnetoresistance (ADMR) in the pseudogap phases of the cuprates and CeCoIn5 are manifestations of dDW. b) The phase diagram of high-Tc cuprates is understood in terms of mean field theory, which includes two order parameters ∆1 and ∆2, where one order paremeter is from dDW and the other from d-wave superconductivity. c) In the optimally to the overdoped region we find the spatially periodic dDW, an analogue of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, becomes more stable. d) In the underdoped region where ∆2/∆1 ≪ 1 the Uemera relation is obtained within the present model. We speculate that the gossamer superconductivity is at the heart of high-Tc cuprate superconductors, the heavy-fermion superconductor CeCoIn5 and the organic superconductors κ-(ET)2Cu(NCS)2 and (TMTSF)2PF6.

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Section: Landau Quantizationsupporting

confidence: 74%

Section: D-wave Density Wavesmentioning

confidence: 99%

Section: D-wave Density Wavesmentioning

confidence: 99%

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Gossamer superconductivity, new paradigm?

Won¹,

Haas

Maki

et al. 2005

Physica Status Solidi (b)

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Gapped optical excitations from gapless phases: Imperfect nesting in unconventional density waves

Dóra¹,

Ványolos²,

Maki³

et al. 2005

Phys. Rev. B

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We consider the effect of imperfect nesting in quasi-one-dimensional unconventional density waves in the case, when the imperfect nesting and the gap depends on the same wavevector component. The phase diagram is very similar to that in a conventional density wave. The density of states is highly asymmetric with respect to the Fermi energy. The optical conductivity at T = 0 remains unchanged for small deviations from perfect nesting. For higher imperfect nesting parameter, an optical gap opens, and considerable amount of spectral weight is transferred to higher frequencies. This makes the optical response of our system very similar to that of a conventional density wave. Qualitatively similar results are expected in d-density waves.

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Quantum criticality in Ce2PdIn8: A thermoelectric study

2011

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We report the Nernst effect (ν) and thermoelectric power (S) data for the Ce2PdIn8 heavyfermion compound. Both S and ν behave anomalously at low temperatures: the thermopower shows a Kondo-like maximum at T = 37 K, while the Nernst coefficient becomes greatly enhanced and field dependent below T ≈ 30 K. In the zero-T limit S/T and ν/T diverge logarithmically, what is related to occurrence of the quantum critical point (QCP). Presented results suggest that the antiferromagnetic spin-density-wave scenario may be applicable to QCP in Ce2PdIn8. PACS numbers: 72.15.Jf, 74.40.Kb, 74.70.Tx The physical properties of matter in the vicinity of quantum critical point (QCP) has been intensively studied for the last two decades. A relation between QCP and unconventional superconductivity, as well as other unusual properties of the electronic system near QCP have attracted much attention, although this complex topic is far from being well understood. Measurements of the thermoelectric effects, which are particularly sensitive to distribution of the density of the electronic states and variation of the relaxation time around the Fermi surface, turn out to be an effective method to detect departures from the Landau description of metals [1][2][3][4][5]. However, an interpretation of these anomalies is not straightforward, since there exist a wide variety of overlapping to some extent models that attempt to explain the unusual thermoelectric behavior. For instance, one can mention here the models of d-wave-(dDW) , spin-(SDW), charge-(CDW), and unconventional-(UDW) density-waves [6,7], magnetic-field-induced chiral order [8], superconducting vortices (or vortex-like excitations) [9], superconducting fluctuations [10], current vertex correction [11]. Even though, studies on temperature and/or magnetic field variations of the Nernst coefficient and the thermoelectric power have been recognized as very helpful tools in distinguishing between possible types of quantum criticality [12][13][14].In this Letter we investigate the transport properties of the Ce 2 PdIn 8 heavy-fermion (HF) compound that exhibits unconventional superconductivity below T c = 0.7 K [15]. We focus on the thermoelectric phenomena which appear to be highly anomalous in the low temperature region. Both the Nernst effect and the thermoelectric power show below T ≈ 7 K features that can be attributed to presence of the quantum critical point.High-quality polycrystalline sample of Ce 2 PdIn 8 was prepared and characterized as described in Ref. [16]. The resistivity was measured using the four-probe technique with 25 µm gold wires attached to the bar-shaped sample with two component silver epoxy (EPO-TEK H20E). For the Hall coefficient measurement, the sample was mounted on a rotatable probe and continuously turned by 180 degree (face down and up) in a magnetic field (B) of 12.5 T to effectively reverse the field anti-symmetrical signal. During the thermoelectric power and Nernst coefficient measurements, the sample was clamped between two phosphor bronze blocks,...

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Unconventional density wave as possible explanation of the Nernst signal in CeCoIn₅

Cited by 3 publications

References 24 publications

Gossamer superconductivity, new paradigm?

Gossamer superconductivity, new paradigm?

Gapped optical excitations from gapless phases: Imperfect nesting in unconventional density waves

Quantum criticality in Ce2PdIn8: A thermoelectric study

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Unconventional density wave as possible explanation of the Nernst signal in CeCoIn5

Cited by 3 publications

References 24 publications

Gossamer superconductivity, new paradigm?

Gossamer superconductivity, new paradigm?

Gapped optical excitations from gapless phases: Imperfect nesting in unconventional density waves

Quantum criticality in Ce2PdIn8: A thermoelectric study

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Product

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Unconventional density wave as possible explanation of the Nernst signal in CeCoIn₅