High-temperature resistivity in the iron pnictides and the electron-doped cuprates

Bach, Paul; Saha, Shanta; Kirshenbaum, Kevin; Paglione, Johnpierre; Greene, R. L.

doi:10.1103/physrevb.83.212506

Cited by 31 publications

(33 citation statements)

References 39 publications

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“…(Here again W is the bandwidth, ( ) The negative sign in (27) shows that the non-magnetic state of the center at large enough coupling constant may become unstable. In that case the electron-ion interactions, Eq.…”

Section: Limit Of Strong Interactionsmentioning

confidence: 99%

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Dual role ofdelectrons in iron pnictides

Gor’kov

Teǐtel'Baum

2013

Phys. Rev. B

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Recent Fe X-ray emission spectroscopy experiments [1] unveiled sizable local moments in ironpnictides in the room-temperature paramagnetic state. In an effort to further clarify the notion of coexisting magnetic moments and itinerant carriers in iron-pnictides we focus on the interactions between the two subsystems. At a moderate on-site Coulomb repulsion the intra-atomic Hund's interaction leads to formation of the non-zero ("bare") local moments on the Fe-sites. We show that the Kondo-like exchange with the itinerant electrons may significantly renormalize the "bare" value of the moments manifested in different experiments. In turn, the itinerant carriers scatter on the renormalized moments that remain disordered in the paramagnetic phase. On the one hand, the scattering mechanism is responsible for high values of resistivity of the stoichiometric pnictides at the temperature of their transition into the antiferromagnetic phase, on the other; it washes out fine details of the Fermi surfaces. The results are rigorous and were obtained without use of any Born-type approximation. It also turned out that value of the local moment and the inverse free time for scattering of carriers on the moments tend in the limit of the strong Kondo exchange to the finite universal values. Independence of the results on the on-site Coulomb repulsion is then illustrated in frameworks of a simplistic model.It is shown that the SDW transition is driven by the RKKY-interactions between the renormalized moments via exchange by the electrons -holes pairs. Applicability of the Boltzmann approach to transport in the multi-band pnictides is briefly discussed.

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Section: Limit Of Strong Interactionsmentioning

confidence: 99%

“…The resistivity above T SDW is controlled by scattering of the electrons on the randomly oriented magnetic moments. Although the resistivity is metallic, ( ) [26]; it is even higher (at 200 K) ~0.5 m Ω ·cm in Sr122 [26,27]. The authors [15,16] argued that so high values signify violation of the Ioffe-Regel criterion.…”

Section: Introductionmentioning

confidence: 99%

Dual role ofdelectrons in iron pnictides

Gor’kov

Teǐtel'Baum

2013

Phys. Rev. B

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“…The superconducting dome and/or magnetic phase are formed from an underlying normal state which exhibits bad-metal behavior with large electrical resistivity at room temperature [1][2][3][4]. It has been proposed that the proximity to a Mott insulating phase is responsible for the bad metal behavior and increase in the electronic correlations in those compounds [3,5].…”

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confidence: 99%

NaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction

Matt

et al. 2016

Phys. Rev. Lett.

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In the studies of iron-pnictides, a key question is whether their bad-metal state from which the superconductivity emerges lies in close proximity with a magnetically ordered insulating phase. Recently it was found that at low temperatures, the heavily Cu-doped NaFe1-xCuxAs (x > 0.3) iron-pnictide is an insulator with long-range antiferromagnetic order, similar to the parent compound of cuprates but distinct from all other iron-pnictides. Using angle-resolved photoemission spectroscopy, we determined the momentum-resolved electronic structure of NaFe1-xCuxAs (x = 0.44) and identified that its ground state is a narrow-gap insulator. Combining the experimental results with density functional theory (DFT) and DFT+U calculations, our analysis reveals that the on-site Coulombic (Hubbard) and Hund's coupling energies play crucial roles in formation of the band gap about the chemical potential. We propose that at finite temperatures charge carriers are thermally excited from the Cu-As-like valence band into the conduction band, which is of Fe 3d-like character. With increasing temperature, the number of electrons in the conduction band becomes larger and the hopping energy between Fe sites increases, and finally the long-range antiferromagnetic order is destroyed at T > TN. Our study provides a basis for investigating the evolution of the electronic structure of a Mott insulator transforming into a bad metallic phase, and eventually forming a superconducting state in iron-pnictides.

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“…In contrast, at the same nominal doping level, A log and A 0 are nearly an order of magnitude larger for the electron-doped compounds; similar to A 2 , these coefficients exhibit power-law doping dependences [25]: NCCO [34] NCCO (film) [33] PCCO (film) [36] PCCO (film) [37] PCCO (film) [38] PCCO (film) [39] PLCCO [28] LCCO (film) [40] LSCO [24] YBCO [7] YBCO [24] YBCO [41] La-Bi2201 [29] La-Bi2201 [27] Hg1201 [15] LYCO [35] NCCO this work NCCO [26] NCCO [31] NCCO [32] FIG. 2.…”

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confidence: 99%

“…Starting with new data for a sample of the archetypal electron-doped cuprate Nd 2−x Ce x CuO 4+δ (NCCO) that exhibits robust AF order (x = 0.10; superconductivity in NCCO appears for x ≈ 0.13 [4]), we follow the evolution of these three contributions as a function of temperature and doping for a large number of compounds: electron-doped NCCO [26,[31][32][33][34], La 2−x Y x CuO 4+δ (LYCO) [35], Pr 2−x Ce x CuO 4+δ (PCCO) [36][37][38][39], Pr 1.3−x La 0.7 Ce x CuO 4+δ (PLCCO) [28], and La 2−x Ce x CuO 4+δ (LCCO) [40], and hole-doped La 2−x Sr x CuO 4 (LSCO) [6,24], YBCO [7,24,41] and Bi 2 Sr 2−x La x Cu 2 O 8+δ (La-Bi2201) [27,29]. Representative resistivity data are shown in Fig.…”

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confidence: 99%

Hidden Fermi-liquid Charge Transport in the Antiferromagnetic Phase of the Electron-Doped Cuprate Superconductors

Tabiś

et al. 2016

Phys. Rev. Lett.

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Systematic analysis of the planar resistivity, Hall effect and cotangent of the Hall angle for the electron-doped cuprates reveals underlying Fermi-liquid behavior even deep in the antiferromagnetic part of the phase diagram. The transport scattering rate exhibits a quadratic temperature dependence, and is nearly independent of doping, compound and carrier type (electrons vs. holes), and hence universal. Our analysis moreover indicates that the material-specific resistivity upturn at low temperatures and low doping has the same origin in both electron-and hole-doped cuprates.The cuprates feature a complex phase diagram that is asymmetric upon electron-versus hole-doping [1] and plagued by compound-specific features associated with different types of disorder and crystal structures [2], often rendering it difficult to discern universal from nonuniversal properties. What is known for certain is that the parent compounds are antiferromagnetic (AF) insulators, that AF correlations are more robust against doping with electrons than with holes [3,4], and that pseudogap (PG) phenomena, seemingly unusual charge transport behavior, and d-wave superconductivity appear upon doping the quintessential CuO 2 planes [1]. The nature of the metallic state that emerges upon doping the insulating parent compounds has remained a central open question. Moreover, below a compound specific doping level, the low-temperature resistivity for both types of cuprates develops a logarithmic upturn that appears to be related to disorder, yet whose microscopic origin has remained unknown [1,[5][6][7]. In contrast, at high dopant concentrations, the cuprates are good metals with welldefined Fermi surfaces and clear evidence for Fermi-liquid (FL) behavior [8][9][10][11][12][13][14].In a new development, the hole-doped cuprates were found to exhibit FL properties in an extended temperature range below the characteristic temperature T * * (T * * < T * ; T * is the PG temperature): (i) the resistivity per CuO 2 sheet exhibits a universal, quadratic temperature dependence, and is inversely proportional to the doped carrier density p, ρ ∝ T 2 /p [15]; (ii) Kohler's rule for the magnetoresistvity, the characteristic of a conventional metal with a single relaxation rate, is obeyed, with a Fermi-liquid scattering rate, 1/τ ∝ T 2 [16]; (iii) the optical scattering rate exhibits the quadratic frequency dependence and the temperature-frequency scaling expected for a Fermi liquid [17]. In this part of the phase diagram, the Hall coefficient is known to be approximately independent of temperature and to take on a value that corresponds to p, R H ∝ 1/p [18]. In order to explore the possible connection among the different regions of the phase diagram, an important quantity to consider is the cotangent of the Hall angle, cot(θ H ) = ρ/(HR H ). For simple metals, this quantity is proportional to the transport scattering rate, cot(θ H ) ∝ m * /τ (H the magnetic field, and m * the effective mass). It has long been known that cot(θ H ) ∝ T 2 in the "strange-metal" ...

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High-temperature resistivity in the iron pnictides and the electron-doped cuprates

Cited by 31 publications

References 39 publications

Dual role ofdelectrons in iron pnictides

Dual role ofdelectrons in iron pnictides

NaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction

Hidden Fermi-liquid Charge Transport in the Antiferromagnetic Phase of the Electron-Doped Cuprate Superconductors

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