Universal Heat Conduction in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>6.9</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Taillefer, Louis; Lussier, Benoit; Gagnon, R.; Behnia, Kamran; Aubin, H.

doi:10.1103/physrevlett.79.483

Cited by 220 publications

(248 citation statements)

References 20 publications

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“…Moreover, as expected for the case of a d-wave gap [6,7], the amplitude of this term was found to be universal; i.e. independent of impurity concentration [5]. Recently, Durst and Lee [3] showed that, regardless of Fermi-liquid corrections, this amplitude is intimately related to the fine structure of the superconducting gap in the vicinity of the nodes.…”

mentioning

confidence: 80%

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
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Low temperature thermal conductivity, κ, of optimally-doped Bi2212 was studied before and after the introduction of point defects by electron irradiation. The amplitude of the linear component of κ remains unchanged, confirming the universal nature of heat transport by zero-energy quasiparticles. The induced decrease in the absolute value of κ at finite temperatures allows us to resolve a nonuniversal term in κ due to conduction by finite-energy quasiparticles. The magnitude of this term provides an estimate of the quasiparticle lifetime at subkelvin temperatures.Fifteen years after their discovery, high-T c superconductors continue to attract significant attention and provoke intense debate [1]. One central issue is the extent of validity of the Fermi-liquid picture for describing the electronic excitations in these systems. The properties of the metallic state (even at optimal doping) appear to remain beyond such a picture. But, are there well-defined quasiparticles (qp) deep in the superconducting state as suggested by ARPES measurements [2]? And if yes, at which energy scale do they break down? To answer these questions, low-energy excitations in the superconducting state are under intense scrutiny [3,4].Low temperature thermal conductivity, κ, has proven to be an instructive probe of such excitations. A non-vanishing linear term in thermal conductivity of optimally-doped Y123 for T → 0 was the first solid evidence for a finite density states of nodal quasiparticles at zero energy [5]. Moreover, as expected for the case of a d-wave gap [6,7], the amplitude of this term was found to be universal; i.e. independent of impurity concentration [5]. Recently, Durst and Lee [3] showed that, regardless of Fermi-liquid corrections, this amplitude is intimately related to the fine structure of the superconducting gap in the vicinity of the nodes. Subsequently, Chiao et al. [4] found a quantitative agreement between this gap structure as deduced from thermal conductivity and the one directly observed by ARPES studies [8] in optimally-doped Bi2212. On the other hand, data on electronic specific heat [9][10][11] and penetration depth [12,13] are limited to T >2K and probe excitations within a higher energy interval where the density of states is a linear function of energy. The temperature dependence of electronic specific heat in Y123 is in agreement with theoretical expectations for the gap structure near the nodes [4,11].

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mentioning

confidence: 80%

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
View full text Add to dashboard Cite

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“…One drawback is the need to separate phonon and electron contributions, but in the cuprate superconductors an asymptotic linear term, κ 0 /T ∼ const which can be attributed solely to quasiparticles is almost always present at the lowest temperatures. After theoretical predictions of the universality of low-T quasiparticle transport in nodal superconductors [1], experimental confirmation was obtained in a number of optimally doped materials [2]. According to the theory, which relies on the disorder-averaged self-consistent T -matrix approximation (SCTMA), the low-T thermal conductivity is given by…”

Section: Introductionmentioning

confidence: 99%

Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments

Andersen

Hirschfeld

2007

Physica C: Superconductivity

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The low-temperature thermal conductivity κ0/T of d-wave superconductors is generally thought to attain a "universal" value independent of disorder at sufficiently low temperatures, providing an important measure of the magnitude of the gap slope near its nodes. We discuss situations in which this inference can break down because of competing order, and quasiparticle localization. Specifically, we study an inhomogeneous BCS mean field model with electronic correlations included via a Hartree approximation for the Hubbard interaction, and show that the suppression of κ0/T by localization effects can be strongly enhanced by magnetic moment formation around potential scatterers.

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“…The presence of line nodes is further supported by a finite κ 00 /T term in zero field. For line nodes, κ 00 /T is given by κ00 T ≃ L0 ρ0 · ξ ab ℓe , where ξ ab and ℓ e are the coherence length and mean free path within the ab-plane, respectively [19]. To estimate ξ ab , we use H s instead of H c c2 , assuming the line nodes in the smaller gap.…”

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confidence: 99%

Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

et al. 2007

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We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first order transition at Hc2 with a reduction of entropy flow. This is a consequence of multi-band superconductivity with compensated electronic structure in the hidden order state of this system. We provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology.The heavy-Fermion compound URu 2 Si 2 has mystified researchers since the superconducting state (T c = 1.5 K) is embedded within the "hidden order" phase (T h = 17.5 K) [1,2,3]. Although several exotic order parameters have been proposed for the hidden order phase [4], it is not identified yet. According to several experimental observations, most of the carriers disappear below T h resulting in a density one order of magnitude smaller than in other heavy-Fermion superconductors [5,6,7]. Superconductivity with such a low density is remarkablesince the superfluid density is very low in some way reminiscent of underdoped cuprates. Moreover, pressure studies reveal that the superconductivity coexists with the hidden order but is suppressed by antiferromagnetic ordering [8].In this Letter, using ultraclean single crystals, we report various anomalous superconducting properties in URu 2 Si 2 . We show that a peculiar electronic structure appearing below the hidden order transition provides an intriguing stage on which a new type of unconventional superconducting state appears.Single crystals of URu 2 Si 2 were grown by the Czochralski pulling method in a tetra-arc furnace. The welldefined superconducting transition was confirmed by the specific heat measurements. The thermal conductivity κ was measured using a standard four-wire steady state method along the a-axis (heat current q a). The contact resistance at low temperatures is less than 10 mΩ.We first discuss the electronic structure below T h . Figure 1 shows the temperature dependence of the resistivity ρ along the a-axis and Hall coefficient R H (solid circles) defined as R H ≡ dρxy dH at H → 0 T for H c in the tetragonal crystal structure. In zero field, ρ depends on T as ρ = ρ 0 + AT 2 below 6 K down to T c . The exceptionally low residual resistivity ρ 0 = 0.48 µΩ cm and large residual resistivity ratio RRR = 670 attest the highest crystal quality currently achievable. R H exhibits an eight-fold increase below T h and attains a T -independent value at low temperatures, associated with a strong reduction of the carrier density. Most remarkably, the magnetoresistance (MR) increases with decreasing temperature and becomes extremely large at the lowest temperatures. The inset of Fig.

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Universal Heat Conduction inYBa2Cu3O6.9

Cited by 220 publications

References 20 publications

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
View full text Add to dashboard Cite

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
View full text Add to dashboard Cite

Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments

Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

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Universal Heat Conduction inYBa2Cu3O6.9

Cited by 220 publications

References 20 publications

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCuNakamae1, Behnia2, Balicas3 et al. 2001Phys. Rev. B4312601View full textAdd to dashboardCite

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCuNakamae1, Behnia2, Balicas3 et al. 2001Phys. Rev. B4312601View full textAdd to dashboardCite

Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments

Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

Contact Info

Product

Resources

About

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
View full text Add to dashboard Cite

Effect of controlled disorder on quasiparticle thermal transport inBi2Sr2CaCu
Nakamae
¹
,
Behnia
²
,
Balicas
³

et al. 2001
Phys. Rev. B
43
12
60
1
View full text Add to dashboard Cite