Far-infrared hopping conductivity in the CuO chains of a single-domain YBa<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml

Schützmann, J.; Gorshunov, B.; Kf, Renk; Münzel, J.; Zibold, A.; Hp, Geserich; Erb, A.; Müller‐Vogt, G.

doi:10.1103/physrevb.46.512

Cited by 44 publications

(48 citation statements)

References 14 publications

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“…λ for the one-electron exchange reaction. This is consistent with the well-resolved data for YBa 2 Cu 3 O 7 [20][21][22][23]47,48].…”

Section: Discussionsupporting

confidence: 81%

“…The conductivity is activated like in semiconductors, but due to structural relaxation rather than a band gap. Activation due to structural relaxation [m = 3/2 (rather than m = 0) in (20)] leads to a minimum in the resistivity as a function of temperature. Simulation based on (23-24) is shown in Fig.…”

Section: One-electron Exchange In the Underdoped Casementioning

confidence: 99%

“…Equation 4 is the MMCT transfer transition at hν = 2.0 eV [19]. In the optimally doped system, there is a minimum in the far infrared optical conductivity at about 300 cm −1 in [20][21][22][23] and La 2−x Sr x CuO 4 [9], probably due to the SC gap. For 800>ν>300 cm −1 , the absorption is due to (4) since it cannot be due to (2), which is independent of doping and at 0.135 eV (∼ 1100 cm −1 ) [14].…”

Section: Introductionmentioning

confidence: 99%

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Conductivity in Cuprates Arises from Two Different Sources: One-Electron Exchange and Disproportionation

Larsson

2016

J Supercond Nov Magn

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Simulation of the resistivity in the normal state of doped La 2−x Sr x CuO 4 has been performed using a hopping model based on Marcus theory. The results are in substantial agreement with experimental results. At oxidative doping, Cu(III) sites are formed and electron mobility possible due to hopping: Cu(III)Cu(II) → Cu(II)Cu(III) (one-electron exchange). In the underdoped, non-metallic region, the resistivity (ρ) decreases from almost insulation at T = 0 to a minimum at about T = 100 K. ρ then increases more than linearly with T (∼ T 3/2 ) in the region 100 < T < 500 K. A photo-induced metal-metal (MM) charge transfer transition at 2 eV 2Cu(II) + hν → Cu(I) + Cu(III) is responsible for the strong absorption in the visible spectrum of La 2 CuO 4 . The down-shift of spectral density with doping (x) in La 2−x Sr x CuO 4 depends on the appearance of Cu(III) sites which makes optical as well as thermal one-electron exchange transitions possible with lower energy. Disproportionation occurs spontaneously for x > 0.06, opening up for electron pair formation. Configuration interaction between two-electron states of low chemical potential, but strong vibrational coupling, gives rise to the superconductor and pseudogaps. Data from photo-induced conductivity and absorption spectra are used in the simulation, which gives results in good agreement with experiments. Possible explanations for Raman and MIR absorption suggest themselves.

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“…λ for the one-electron exchange reaction. This is consistent with the well-resolved data for YBa 2 Cu 3 O 7 [20][21][22][23]47,48].…”

Section: Discussionsupporting

confidence: 81%

Section: One-electron Exchange In the Underdoped Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Conductivity in Cuprates Arises from Two Different Sources: One-Electron Exchange and Disproportionation

Larsson

2016

J Supercond Nov Magn

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“…The broad electronic features are similar to those reported for reflectivity data [1,2,[5][6][7]. The NS the conductivity consists of a Drude-like peak at low frequencies that merges with a broad MIR-band which extends beyond the displayed range.…”

supporting

confidence: 69%

“…The far-infrared (FIR) dielectric response of the cuprate high-T c superconductors (HTSC) has been extensively studied by conventional reflection and absorption techniques [1][2][3][4][5][6][7]. Nevertheless, some important aspects of the FIR in-plane response remain unsettled, such as the low-energy electronic excitations in the superconducting (SC) state or the in-plane polarized IR-active phonon modes.…”

mentioning

confidence: 99%