Hole depletion and localization due to disorder in insulating<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PrBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow>

Shukla, Abhay; Barbiellini, B.; Erb, A.; Manuel, Α. A.; Buslaps, T.; Honkimäki, V.; Suortti, P.

doi:10.1103/physrevb.59.12127

Cited by 53 publications

(34 citation statements)

References 40 publications

(88 reference statements)

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“…3, is also equal to the difference of profiles 20 between two crystallographic directions [100] -[110] and it can be compared to a similar Compton profile anisotropy measured by Shukla et al at a lower hole doping. 48 The amplitude of the theory is the same as that in the experiment, while in Ref. 48 the theoretical A 1d (p x ) had to be scaled down by a factor of 1.4 to obtain agreement with experiment.…”

Section: Momentum Density Anisotropymentioning

confidence: 99%

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
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We have observed the bulk Fermi surface (FS) in an overdoped (x=0.3) single crystal of La2−xSrxCuO4 by using Compton scattering. A two-dimensional (2D) momentum density reconstruction from measured Compton profiles yields a clear FS signature in the third Brillouin zone along [100]. The quantitative agreement between density functional theory (DFT) calculations and momentum density experiment suggests that Fermi-liquid physics is restored in the overdoped regime. In particular the predicted FS topology is found to be in good accord with the corresponding experimental data. We find similar quantitative agreement between the measured 2D angular correlation of positron annihilation radiation (2D-ACAR) spectra and the DFT based computations. However, 2D-ACAR does not give such a clear signature of the FS in the extended momentum space in either the theory or the experiment.

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Section: Momentum Density Anisotropymentioning

confidence: 99%

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
View full text Add to dashboard Cite

show abstract

“…This is important because this difference originates in the MnO planes which are the seat of the CMR properties. Similar effects have been observed in the metallic YBa 2 Cu 3 O 7 and insulating PrBa 2 Cu 3 O 7 systems [18]. However, this is the first time that this effect has been observed on the same sample under the influence of external parameters such as temperature and magnetic field.…”

mentioning

confidence: 64%

“…3 all the metallic A 1D (p z ) look remarkably alike, showing that the overall description of the electronic structure is satisfactory. In particular, the amplitude of A 1D (p z ) in the resolution-broadened theory is the same as that in the experiment while in the case of the cuprates the theoretical A 1D (p z ) had to be scaled down by a factor of 1.4 to obtain agreement with experiment [18]. The experimental curve for the insulator (paramagnetic phase), however, presents important changes in the low-momentum region indicating that the electrons with p oxygen character at the FS structure near (0.5, 0) a.u.…”

mentioning

confidence: 87%

See 2 more Smart Citations

Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive OxideLa2−2xSr1+2xMn2
Barbiellini
¹
,
Koizumi
²
,
Mijnarends
³

et al. 2009
Phys. Rev. Lett.
27
0
15
0
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We have studied the [100]- [110] anisotropy of the Compton profile in the bilayer manganite. Quantitative agreement is found between theory and experiment with respect to the anisotropy in the two metallic phases (i.e. the low temperature ferromagnetic and the colossal magnetoresistant phase under a magnetic field of 7 T). Robust signatures of the metal-insulator transition are identified in the momentum density for the paramagnetic phase above the Curie temperature. We interpret our results as providing direct evidence for the transition from the metallic-like to the admixed ioniccovalent bonding accompanying the magnetic transition. The number of electrons involved in this phase transition is estimated from the area enclosed by the Compton profile anisotropy differences. Our study demonstrates the sensitivity of the Compton scattering technique for identifying the number and type of electrons involved in the metal-insulator transition. [5,6]. Above T c , the phase diagram displays an insulating paramagnetic (PM) phase. The Mn-3d electronic states, which are responsible for these properties, split into e g and t 2g contributions in the crystal field of the MnO 6 octahedron. The FM phase below T c and its metallic conductivity are usually explained on the basis of the double exchange (DE) mechanism [7], where e g electrons hop between Mn sites through hybridization with the oxygen 2p orbitals and align the localized t 2g spins by the exchange interaction. While the DE mechanism appears to capture the tendency towards ferromagnetism, it still remains unclear if oxygen orbitals should be explicitly included in the electronic degrees of freedom, or whether they can be integrated out as is often assumed in the standard models [8,9].Recent magnetic Compton scattering (MCS) studies [10] of the manganite FM phase have shown how the occupation numbers of the e g states vary with doping [11,12] as well as temperature [13,14]. In addition, they have provided evidence for the coexistence of localized and itinerant e g magnetic electrons [15,16] in the FM phase. MCS has also been used to study other spintronics materials such as magnetite Fe 3 O 4 and its mysterious Verwey transition [17].In this letter, we show that the anisotropy of high resolution Compton profiles (CP) displays a striking difference between the insulating PM and metallic FM case. This is important because this difference originates in the MnO planes which are the seat of the CMR properties. Similar effects have been observed in the metallic YBa 2 Cu 3 O 7 and insulating PrBa 2 Cu 3 O 7 systems [18]. However, this is the first time that this effect has been observed on the same sample under the influence of external parameters such as temperature and magnetic field. We also provide a measure of the number of electrons involved in the CMR effect.Compton scattering, or inelastic scattering with very

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Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Akhavan

2004

Physica Status Solidi (b)

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In spite of the vast amount of experimental and theoretical knowledge accumulated in HTSC, the nature of the interaction driving charge carriers to form Cooper pairs below T c is still unknown. To elucidate the controversial insulating/SC Pr123, the substitution of Pr at Ba site (Pr@Ba) with Ba at Pr site (Ba@Pr) in R123 is compared and reviewed. This might shed some light on the microscopic origin of HTSC.

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Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

Cited by 53 publications

References 40 publications

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
View full text Add to dashboard Cite

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
View full text Add to dashboard Cite

Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive OxideLa2−2xSr1+2xMn2
Barbiellini
¹
,
Koizumi
²
,
Mijnarends
³

et al. 2009
Phys. Rev. Lett.
27
0
15
0
View full text Add to dashboard Cite

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

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Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

Cited by 53 publications

References 40 publications

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4Al-Sawai1, Barbiellini2, Sakurai3 et al. 2012Phys. Rev. B12160View full textAdd to dashboardCite

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4Al-Sawai1, Barbiellini2, Sakurai3 et al. 2012Phys. Rev. B12160View full textAdd to dashboardCite

Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive OxideLa2−2xSr1+2xMn2Barbiellini1, Koizumi2, Mijnarends3 et al. 2009Phys. Rev. Lett.270150View full textAdd to dashboardCite

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Contact Info

Product

Resources

About

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
View full text Add to dashboard Cite

Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4
Al-Sawai
¹
,
Barbiellini
²
,
Sakurai
³

et al. 2012
Phys. Rev. B
12
1
6
0
View full text Add to dashboard Cite

Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive OxideLa2−2xSr1+2xMn2
Barbiellini
¹
,
Koizumi
²
,
Mijnarends
³

et al. 2009
Phys. Rev. Lett.
27
0
15
0
View full text Add to dashboard Cite