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Yu, Rong; Salamon, M. B.; Lu, Jianping; Lee, W. C.

doi:10.1103/physrevlett.69.1431

Cited by 277 publications

(120 citation statements)

References 24 publications

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“…Recent experiments [20][21][22][23][24][25][26] [24,25] and optical conductivity [25,26]. In all these experiments, much better metallic properties have been clearly seen along the direction of the chains (b-axis).…”

Section: ∆ ρ(T) ∝ T (1-∆/t) At High Temperatures T > ∆mentioning

confidence: 98%

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

1999

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The temperature dependence of the resistivity ρ(T) of the novel Sr 2.5 Ca 11.5 Cu 24 O 41 ladder compound under hydrostatic pressure of up to 8 GPa has been explained by assuming that the relevant length scale for electrical transport is given by the magnetic correlation length related to the opening of a spin-gap in a 1D even-chain spin-ladder (1D-SL). The pressure dependence of the gap was extracted by applying this model to ρ(T) data obtained at different pressures. The ρ(T) dependence of the underdoped cuprate YBa 2 Cu 4 O 8 demonstrates a remarkable scaling with the ρ(T) of the 1D-SL compound Sr 2.5 Ca 11.5 Cu 24 O 41 . This scaling implies that underdoped cuprates at T c < T < T * are in the 1D regime and their pseudo-gap below T * is the spin-gap in the even-chain 1D-SL formed at T < T * in these materials. The temperature dependent resistivity ρ(T) of high-T c cuprates has recently been interpreted in the framework of the two-dimensional (2D) Heisenberg model [1]. The approach proposed in Ref. 1 is based on the three basic assumptions: (i) the dominant scattering mechanism in high-T c 's in the whole temperature range is of magnetic origin; (ii) the specific temperature dependence of the resistivity ρ(T) can be described by the inverse quantum conductivity σ -1 with the inelastic length L φ being fully controlled, via a strong interaction of holes with Cu 2+ spins, by the magnetic correlation length ξ m , and, finally, (iii) the proper 2D expressions should be used for calculating the quantum conductivity with L φ~ξm .With a few straightforward modifications, these ideas can also be applied to the 1D quantum spin-ladder (SL) systems [2]. In this case the quantum resistance of a single 1D wire is a linear function of the inelastic length L φ [3] and ρ(T) can be represented asHere b is the diameter of a single 1D wire and L φ~ξm1D is given by the spin-correlation length ξ m1D in the 1D regime. For a quantum 1D transport, the concentration of the

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Section: ∆ ρ(T) ∝ T (1-∆/t) At High Temperatures T > ∆mentioning

confidence: 98%

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

1999

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“…The positive sign of thermopower for both samples indicated that the orientation of heat current was nearly parallel to the quasi-onedimensional sheets of Fermi surface and thus mainly implying the hole-like carriers of the two-dimensional pockets [10]. A similar upturn in the thermal conductivity of high-T c superconductors has been a subject of controversy for several years [11]. The increase in thermal conductivity below T c indicates that the condensation of electrons in the superconducting state strengthens heat transport by reducing the scattering of heat carriers.…”

mentioning

confidence: 98%

“…The debate was centered on the identity of these heat carriers. While an orthodox scenario [12] invoked an increase in the lattice conductivity due to condensation of electrons, experimental evidence for a very unusual increase in the electronic relaxation time in the superconducting state [13] led to the suggestion [11] that at least part of the upturn in κ is due to a steep increase in the electronic contribution. Strong support for the latter point of view was provided by thermal Hall effet measurements [14].…”

mentioning

confidence: 99%

Heat Conduction inκ−(BEDT−TTF)2Cu(NCS)2
Belin
¹
,
Behnia
²
,
Deluzet
³

1998
Phys. Rev. Lett.
98
12
64
2
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The first study of thermal conductivity, κ, in a quasi-two-dimensional organic superconductor of the κ-(BEDT-TTF)2X family reveals features analogous to those already observed in the cuprates. The onset of superconductivity is associated with a sudden increase in κ which can be suppressed by the application of a moderate magnetic field. At low temperatures, a finite linear term -due to a residual electronic contribution-was resolved. The magnitude of this term is close to what is predicted by the theory of transport in unconventional superconductors.The superconductors of κ-(BEDT-TTF) 2 X family [1] share a number of similarities with the high-T c cuprates [2]. Both sets of compounds are quasi-two-dimensional with superconductivity confined to conducting planes sandwiched between insulating layers. The metallic state in both families exhibit common features like low carrier densities, strong electronic correlations and proximity of antiferromagnetic insulating state. While Shubnikov-de Haas experiments [3] have established the existence of a well-defined Fermi surface in the κ-(BEDT-TTF) 2 X family, this metallic state presents some more unconventional properties -like a pseudogap in the electronic density of states in κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br [4]-which have been compared to analagous features in underdoped cuprates [2]. As for the symmetry of the superconducting order parameter, it has yet to become the subject of a consensus as nowadays it is the case in the cuprates. While, early penetration-depth studies on κ-(BEDT-TTF) 2 Cu(NCS) 2 led to conflicting results [5], recent NMR [6] and specific heat [7] studies on κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br provided evidence for the presence of nodes in the superconducting gap.In this letter we present the first study of thermal conductivity in a member of this family. According to our results, heat transport in κ-(BEDT-TTF) 2 Cu(NCS) 2 presents features which have already been detected in YBCO and other high-T c cuprates. Notably, the observation of a residual electronic thermal conductivity at very low temperatures provides strong support for presence of nodes in the superconducting order parameter.We measured the thermal conductivity of five κ-(BEDT-TTF) 2 Cu(NCS) 2 single crystals using a conventional four-probe method. Contacts were realized using silver paint on evaporated gold. The heat current was always applied in the basal (highly-conducting) plane. The temperature gradient was measured with two RuO 2 resistance chips which showed small magnetoresistance and a usable sensitivity up to 15K. The resistive heater and the two thermometers were held by small solenoids of 50 µm manganin wire. In this way, we measured the resistance of the sample and the thermometers with minimal heat loss. For temperatures below 0.25 K, we checked our zero-field results by using another device which was designed for very low temperatures and described elsewhere [8]. Our set-up allowed us to measure, in addition to electrical and thermal conductivities, the thermo-electric power of th...

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“…1(b), no discernible anomaly is observed in κ/T at T c . In the superconductors with strong electron correlation effect, including cuprates 23 , iron-pnictides 24 and heavy fermions [25][26][27] , the striking enhancement of the thermal conductivity just below T c is often observed. This enhancement is caused by the strong suppression of the quasiparticle inelastic scattering rate due to the formation of superconducting gap, which overcomes reduction of the quasiparticle density of states.…”

mentioning

confidence: 99%

Conventional s-Wave Superconductivity in BiS₂-Based NdO_0.71F_0.29BiS₂ Revealed by Thermal Transport Measurements

et al. 2016

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Conventional s-wave superconductivity in BiS 2 -based NdO 0.71 F 0.29 BiS 2 revealed by thermal transport measurements To study the superconducting gap structure of BiS2-based layered compound NdO0.71F0.29BiS2 (T c = 5 K), we measured the thermal conductivity κ, which is a sensitive probe of low-energy quasiparticle spectrum. In the absence of a magnetic field, residual linear term in the thermal conductivity κ0/T at T → 0 is vanishingly small, indicating that the residual normal fluid, which is expected for nodal superconductors, is absent. Moreover, the applied magnetic field hardly affects thermal conductivity in wide range of the vortex state, indicating the absence of Doppler shifted quasiparticles. These results provide evidence that NdO0.71F0.29BiS2 is a fully gapped superconductor. The obtained gap structure, along with the robustness of the superconductivity against the impurity, suggest a conventional s-wave superconducting state in NdO0.71F0.29BiS2.

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Thermal conductivity of an untwinnedYBa2Cu3

Cited by 277 publications

References 24 publications

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

Heat Conduction inκ−(BEDT−TTF)2Cu(NCS)2
Belin
¹
,
Behnia
²
,
Deluzet
³

1998
Phys. Rev. Lett.
98
12
64
2
View full text Add to dashboard Cite

Conventional s-Wave Superconductivity in BiS₂-Based NdO_0.71F_0.29BiS₂ Revealed by Thermal Transport Measurements

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Thermal conductivity of an untwinnedYBa2Cu3

Cited by 277 publications

References 24 publications

1D quantum transport in the even-chain spin-ladder compound Sr 2.5 Ca 11.5 Cu 24 O 41 and YBa 2 Cu 4 O 8

1D quantum transport in the even-chain spin-ladder compound Sr 2.5 Ca 11.5 Cu 24 O 41 and YBa 2 Cu 4 O 8

Heat Conduction inκ−(BEDT−TTF)2Cu(NCS)2Belin1, Behnia2, Deluzet3 1998Phys. Rev. Lett.9812642View full textAdd to dashboardCite

Conventional s-Wave Superconductivity in BiS2-Based NdO0.71F0.29BiS2 Revealed by Thermal Transport Measurements

Contact Info

Product

Resources

About

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

1D quantum transport in the even-chain spin-ladder compound Sr _2.5 Ca _11.5 Cu ₂₄ O ₄₁ and YBa ₂ Cu ₄ O ₈

Heat Conduction inκ−(BEDT−TTF)2Cu(NCS)2
Belin
¹
,
Behnia
²
,
Deluzet
³

1998
Phys. Rev. Lett.
98
12
64
2
View full text Add to dashboard Cite

Conventional s-Wave Superconductivity in BiS₂-Based NdO_0.71F_0.29BiS₂ Revealed by Thermal Transport Measurements