Transport phenomena in a three-dimensional system close to the magnetic quantum critical point: The conserving approximation with current vertex corrections

Onari, Seiichiro; Kontani, Hiroshi; Tanaka, Yukio

doi:10.1103/physrevb.73.224434

Cited by 15 publications

(8 citation statements)

References 44 publications

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“…Indeed, the Curie-Weiss-like temperature dependence of R H has been observed in cuprate, heavy-fermion, and iron-pnictide superconductors with strong AF spin fluctuations. 28,29 In the theories involving the vertex corrections 30,31 , where the backflow effect originating from the charge conservation law in the presence of strong electron correlations is taking into account 28 , the enhanced R H in the presence of AF spin fluctuations can be naturally understood by the enlarged AF correlation length. It has been also pointed out theoretically and observed experimentally that such strong AF spin fluctuations also affect the magnetoresistance ∆ρ xx (H)/ρ xx (0) = [ρ xx (H)-ρ xx (0)]/ρ xx (0); unlike the conventional Kohler's rule (the scaling by H/ρ xx (0)), the magnetoresistance can be scaled by tan 2 Θ H where Θ H is the Hall angle.…”

Section: Resultsmentioning

confidence: 99%

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

Sun

Shahi

et al. 2017

Phys. Rev. Lett.

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The importance of electron-hole interband interactions is widely acknowledged for iron-pnictide superconductors with high transition temperatures (T c ). However, the absence of hole pockets near the Fermi level of the iron-selenide (FeSe) derived high-T c superconductors raises a fundamental question whether iron pnictides and chalcogenides have different pairing mechanisms. Here, we study the properties of electronic structure in the high-T c phase induced by pressure in bulk FeSe from magneto-transport measurements and first-principles calculations. With increasing pressure, the low-T c superconducting phase transforms into high-T c phase, where we find the normal-state Hall resistivity changes sign from negative to positive, demonstrating dominant hole carriers in contrast to other FeSe-derived high-T c systems. Moreover, the Hall coefficient is enlarged and the magnetoresistance exhibits anomalous scaling behaviors, evidencing strongly enhanced interband spin fluctuations in the high-T c phase. These results in FeSe highlight similarities with high-T c phases of iron pnictides, constituting a step toward a unified understanding of iron-based superconductivity. 2The Fermi surface (FS) topology and its interplay with magnetism have been considered key ingredients in understanding the mechanism of the iron-based superconductors.1, 2 For the FeAsbased superconductors, the FS typically consists of hole-and electron-like pockets near the Brillouin zone center (Γ point) and corners (M point), respectively. As such, an interband scattering between the hole and electron pockets has been proposed as an important mechanism for electron pairing in the iron-based superconductors, leading to an s± pairing state favored by the antiferromagnetic fluctuations. carriers, yet can still enhance T c of bulk FeSe up to ~40 K near 6 GPa. 16,17 More importantly, our recent high-pressure study has shown explicitly that the optimal T c is achieved when the longrange antiferromagnetic order just vanishes, 18 Fig. 1, reminiscent of the situations seen frequently in the FeAs-based superconductors. However, to make this connection, it is important to have information about the evolution of FS under high pressure -a regime in which ARPES experiments are impractical, and where quantum oscillation measurements are challenging.Here we report Hall resistivity ρ xy measurements under hydrostatic pressures up to 8.8 GPa in order to gain insights into the electronic structure evolution of FeSe at high pressure. Our results demonstrate that the electrical transport properties of FeSe at high pressures with T c max = 38.3 K are dominated by the hole carriers, Fig. 1, which is in contrast with the known FeSe-derived high-T c superconductors that are usually heavily electron doped. In addition, we observed an enhancement of Hall coefficient R H near the critical pressure where the optimal T c is realized with a simultaneous suppression of the long-range magnetic order. This implies a strong reconstruction of the Fermi surface due to antifer...

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Section: Resultsmentioning

confidence: 99%

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

Sun

Shahi

et al. 2017

Phys. Rev. Lett.

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“…We note that a recent calculation based on the band structure of CeCoIn 5 is quantitatively compatible with the enhancement of R H below T coh . 68) Enhancement of the amplitude of R H at low temperatures has been reported for other quasi-2D strongly correlated systems, -(BEDT-TTF) 2 Cu(NCS) 2 69-71) and R 2Àx Bi x Ru 2 O 7 (R ¼ Sm and Eu). 72) In addition, enhancement has also been reported for the 3D strongly corrrelated system V 2Ày O 3 .…”

Section: Anomalous Enhancement Of the Hall Coefficientmentioning

confidence: 90%

Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn₅ (M: Co and Rh): Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-T_c Cuprates

et al. 2007

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We present a systematic study of the dc-resistivity, Hall effect, and magnetoresistance in the normal state of quasi two-dimensional (2D) heavy fermion superconductors CeMIn 5 (M: Rh and Co) under pressure. Here the electronic system evolves with pressure from an antiferromagnetic (AF) metal, through a highly unconventional non-Fermi liquid, and finally into a Fermi-liquid state. The novelty of these materials is best highlighted when compared with LaMIn 5 , a system with similar electronic structures, which shows a nearly temperature independent Hall coefficient and a magnetoresisitance which is well described by the classical Kohler's rule. In sharp contrast, in CeMIn 5 , the amplitude of the Hall coefficient increases dramatically with decreasing temperature, reaching at low temperatures a value significantly larger than 1=ne, where n is the carrier number. Furthermore, the magnetoresistance is characterized by T-and H-dependence which clearly violate Kohler's rule. We found that the cotangent of the Hall angle cot Â H varies as T 2 , and the magnetoresistance is well scaled by the Hall angle as Á xx = xx / tan 2 Â H . These non-Fermi liquid properties in the electron transport are remarkably pronounced when the AF fluctuations are enhanced in the vicinity of the quantum critical point. We lay particular emphasis on the striking resemblance of these anomalous magnetotransport with those of the high-T c cuprates. We argue that features commonly observed in quasi 2D heavy fermion and cuprates very likely capture universal features of strongly correlated electron systems in the presence of strong AF fluctuations, holding the promise of bridging our understanding of heavy fermion systems and high-T c cuprates.

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“…This approximation is known to fail in presence of antiferromagnetic fluctuations, which lead to interaction induced drag between quasiparticles. 62 Therefore, the assumption of a single-particle relaxation rate is restricted to temperatures below the ordering temperatures of spin and charge order. From Eq.…”

Section: Semiclassical Transportmentioning

confidence: 99%

Quasiparticle Nernst effect in stripe-ordered cuprates

2010

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The Nernst signal appears enhanced near 1/8 hole doping and its onset temperature scales with the stripe-ordering temperature over some range of doping. Here, we employ a phenomenological quasiparticle model to calculate the normal-state Nernst signal in the presence of stripe order. We find that Fermi pockets caused by translational symmetry breaking lead to a strongly enhanced Nernst signal, with a sign depending on the modulation period of the ordered state and other details of the Fermi surface. This implies differences between antiferromagnetic and charge-only stripes. We also analyze the anisotropy of the Nernst signal and compare our findings with recent data from La1.6−xNd0.4SrxCuO4 and YBa2Cu3Oy.

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Transport phenomena in a three-dimensional system close to the magnetic quantum critical point: The conserving approximation with current vertex corrections

Cited by 15 publications

References 44 publications

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn₅ (M: Co and Rh): Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-T_c Cuprates

Quasiparticle Nernst effect in stripe-ordered cuprates

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Transport phenomena in a three-dimensional system close to the magnetic quantum critical point: The conserving approximation with current vertex corrections

Cited by 15 publications

References 44 publications

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn5 (M: Co and Rh): Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-Tc Cuprates

Quasiparticle Nernst effect in stripe-ordered cuprates

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Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn₅ (M: Co and Rh): Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-T_c Cuprates