Raman study of pure and doped (Li,Sr) single crystals of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Ohana, I.; Dresselhaus, M. S.; Liu, Y. C.; Picone, P. J.; Gabbe, D. R.; Jenssen, H. P.; Dresselhaus, G.

doi:10.1103/physrevb.39.2293

Cited by 30 publications

(12 citation statements)

References 26 publications

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“…However, this measurement does not seem to correspond to the E g La mode since theory predicts a value of 27 cm Ϫ1 in agreement with previous findings. 4 When doped with Sr the experimental A 1g O2 frequency decreases slightly, 30 which is parallel to our findings for the Ba doping.…”

Section: B Phonons and Raman Spectrasupporting

confidence: 85%

“…For the E g mode the experimental discrepancy is even bigger: values of 180, 231, and 367 cm Ϫ1 have been assigned to the E g O2 mode. 30 The only available experimental value assigned to the E g La vibration is 149 cm Ϫ1 . However, this measurement does not seem to correspond to the E g La mode since theory predicts a value of 27 cm Ϫ1 in agreement with previous findings.…”

Section: B Phonons and Raman Spectramentioning

confidence: 99%

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Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
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We studied the doping dependence of the electronic structure and the Raman-active phonon modes in the high-temperature superconductor La 2Ϫx Ba x CuO 4 . Thereby, doping concentrations from the undoped case (x ϭ0) up to the overdoped case (xϭ0.14) were considered. All obtained phonon frequencies compare well to published data for La 2Ϫx Sr x CuO 4 . For optimal doping of x opt Ϸ0.12 the A 1g Raman spectra show a huge increase in intensity for certain scattering geometries indicating enhanced electron-phonon coupling. The effects of doping on the density of states, Fermi surface, and electric-field gradients were also investigated.

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Section: B Phonons and Raman Spectrasupporting

confidence: 85%

Section: B Phonons and Raman Spectramentioning

confidence: 99%

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
View full text Add to dashboard Cite

show abstract

“…3. Based on the early results, [9][10][11][12][13][14] the Raman peak at about 238 cm −1 is identified as the E g vibration of the outof-plane oxygen atoms being parallel to the CuO 2 layer. The two Raman scattering peaks at about 438 and 680 cm −1 in two systems are ascribed to the A 1g vibration of apical oxygen atoms along the c axis and the symmetry-forbidden inplane oxygen vibration induced to be Raman active by local disorder, respectively.…”

Section: A Structurementioning

confidence: 99%

Coexistence and competition between superconductivity and magnetism in La2−xSrxCu0.94M0.06O4 (M=Mn and Ru)

Tan

et al. 2008

Journal of Applied Physics

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The infrared (IR) transmission, Raman Scattering, magnetic measurement, and electronic resistance measurement have been carried out in La2−xSrxCu0.94Mn0.06O4 and La2−xSrxCu0.94Ru0.06O4 systems. The superconductivity that is suppressed by impurity reappears as Sr content increases and forms a new relationship of the Meissner volume and Tconset versus Sr doping content. The Mn4+ doping system exhibits twice superconductive phase transitions while Ru4+ doping system exhibits only one superconductive phase transition. Coexistence and competition between superconductivity and magnetism are observed. We suggest that these surprising phenomena should be attributed to the compensation effect that is the electrons on high valence impurities are compensated by holes introduced through Sr doping. This compensation effect is confirmed by our IR spectra results. We also find that the compensation effect is strong for the localized 3d electrons of Mn4+ while very weak for the itinerant 4d electrons of Ru4+.

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“…Because of the established relation between phonons and superconductivity in conventional superconductors, bulk phonons of the HTSC and their parent compounds received considerable attention in the early years following their discovery. Optical spectroscopies (infrared (IR) and Raman) 4,5,6,7,8,9 and neutron scattering experiments 10,11,12 were used to study the lattice dynamics of these compounds. Although it is believed that spin interactions play an important role in the superconducting properties of HTSC cuprates, the role of the electron-phonon coupling still remains a puzzle.…”

Section: Introductionmentioning

confidence: 99%

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

et al. 2005

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Structure and lattice dynamics of the (001) surface of Sr2CuO2Cl2 have been studied by helium atom scattering (HAS). Analysis of diffraction patterns obtained by elastic HAS revealed a surface periodicity consistent with bulk termination, and confirms that the surface is non-polar and stable which favors a SrCl surface termination. Bulk and surface lattice dynamical calculations based on the shell-model were carried out to characterize the experimental phonon dispersions obtained by inelastic HAS. No experimental surface mode was observed above 200 cm −1 . Comparison between the experimental data and theoretical results for two different slabs with SrCl and CuO2 terminations showed that the experimental data conforms exclusively with the SrCl surface modes.

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Raman study of pure and doped (Li,Sr) single crystals ofLa2CuO4−y

Cited by 30 publications

References 26 publications

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
View full text Add to dashboard Cite

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
View full text Add to dashboard Cite

Coexistence and competition between superconductivity and magnetism in La2−xSrxCu0.94M0.06O4 (M=Mn and Ru)

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

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Raman study of pure and doped (Li,Sr) single crystals ofLa2CuO4−y

Cited by 30 publications

References 26 publications

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBaxThonhauser1, Draxl2 2003Phys. Rev. B8060View full textAdd to dashboardCite

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBaxThonhauser1, Draxl2 2003Phys. Rev. B8060View full textAdd to dashboardCite

Coexistence and competition between superconductivity and magnetism in La2−xSrxCu0.94M0.06O4 (M=Mn and Ru)

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

Contact Info

Product

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About

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
View full text Add to dashboard Cite

Doping dependence of the electronic structure and the Raman-active modes inLa2−xBax
Thonhauser
¹
,
Draxl
²

2003
Phys. Rev. B
8
0
6
0
View full text Add to dashboard Cite