Positive Seebeck coefficient in highly doped La$_{2-x}$Sr$_x$CuO$_4$ ($x$=0.33); its origin and implication

Jin, Hao; Narduzzo, Alessandro; Nohara, Minoru; Takagi, Hidenori; Hussey, Nigel; Behnia, Kamran

doi:10.48550/arxiv.2101.10750

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…To highlight this need, let us mention that a calculation of S based on the band structure of Nd-LSCO yields a negative value above p [45], in contrast with the measured positive value. This sign issue has recently been investigated [46,47].…”

Section: B Pseudogap Phase (P < P )mentioning

confidence: 99%

Thermopower across the phase diagram of the cuprate La1.6−xNd0.4SrxCuO4 : Signatures of the pseudogap and charge density wave

et al. 2021

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The Seebeck coefficient (thermopower) S of the cuprate superconductor La 1.6−x Nd 0.4 Sr x CuO 4 was measured across its doping phase diagram (from p = 0.12 to p = 0.25), at various temperatures down to T 2 K, in the normal state accessed by suppressing superconductivity with a magnetic field up to H = 37.5 T. The magnitude of S/T in the T = 0 limit is found to suddenly increase, by a factor 5, when the doping is reduced below p = 0.23, the critical doping for the onset of the pseudogap phase. This confirms that the pseudogap phase causes a large reduction of the carrier density n, consistent with a drop from n = 1 + p above p to n = p below p , as previously inferred from measurements of the Hall coefficient, resistivity, and thermal conductivity. When the doping is reduced below p = 0.19, a qualitative change is observed whereby S/T decreases as T → 0, eventually to reach negative values at T = 0. In prior work on other cuprates, negative values of S/T at T → 0 were shown to result from a reconstruction of the Fermi surface caused by charge density wave (CDW) order. We therefore identify p CDW 0.19 as the critical doping beyond which there is no CDW-induced Fermi surface reconstruction. The fact that p CDW is well separated from p reveals that there is a doping range below p where the transport signatures of the pseudogap phase are unaffected by CDW correlations, as previously found in YBa 2 Cu 3 O y and La 2−x Sr x CuO 4 .

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Section: B Pseudogap Phase (P < P )mentioning

confidence: 99%

Thermopower across the phase diagram of the cuprate La1.6−xNd0.4SrxCuO4 : Signatures of the pseudogap and charge density wave

et al. 2021

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“…Note added. As this work was being written, a preprint by Jin et al [66] was posted which also emphasizes the relevance of the particle-hole asymmetry of the scattering rate for the sign of the Seebeck coefficient.…”

mentioning

confidence: 99%

Skewed Non-Fermi Liquids and the Seebeck Effect

Georges,

Mravlje

2021

Preprint

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We consider non-Fermi liquids in which the inelastic scattering rate has an intrinsic particle-hole asymmetry and obeys ω/T scaling. We show that, in contrast to Fermi liquids, this asymmetry influences the low-temperature behaviour of the thermopower even in the presence of impurity scattering. Implications for the unconventional sign and temperature dependence of the thermopower in cuprates in the strange metal (Planckian) regime are emphasized.

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“…In principle, both of these can lead to a sign change of S xx for T > T * . Recently a frequency dependence in Σ 0 has been assumed to explain the unexpected sign of S xx in a heavily overdoped cuprate [110] where one encounters a similar situation.…”

Section: Thermopowermentioning

confidence: 99%

Unified approach to electrical and thermal transport in high-$T_c$ superconductors

Boyack,

Wang,

Chen

et al. 2021

Preprint

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Positive Seebeck coefficient in highly doped La$_{2-x}$Sr$_x$CuO$_4$ ($x$=0.33); its origin and implication

Cited by 3 publications

References 26 publications

Thermopower across the phase diagram of the cuprate La1.6−xNd0.4SrxCuO4 : Signatures of the pseudogap and charge density wave

Thermopower across the phase diagram of the cuprate La1.6−xNd0.4SrxCuO4 : Signatures of the pseudogap and charge density wave

Skewed Non-Fermi Liquids and the Seebeck Effect

Unified approach to electrical and thermal transport in high-$T_c$ superconductors

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