Large single crystal Bi-2212 along the c-axis prepared by floating zone method

Gu, Genda; Takamuku, K.; Koshizuka, N.; Tanaka, Shōji

doi:10.1016/0022-0248(93)90872-t

Cited by 128 publications

(45 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most complete comparison can be made for optimally doped Bi2212, for which high quality IR 26 and ARPES 44 data sets exist, all obtained on the samples from the same batch 45 . Although data at different temperatures are available, we believe that will not change the main results and conclusions in any significant way, as ARPES data display little temperature dependence below 70 K (Ref 44).…”

Section: Ir-arpes Comparisonmentioning

confidence: 99%

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Dordevic

Homes

et al. 2005

Phys. Rev. B

View full text Add to dashboard Cite

We present a new method of extracting electron-boson spectral function α 2 F(ω) from infrared and photoemission data. This procedure is based on inverse theory and will be shown to be superior to previous techniques. Numerical implementation of the algorithm is presented in detail and then used to accurately determine the doping and temperature dependence of the spectral function in several families of high-Tc superconductors. Principal limitations of extracting α 2 F(ω) from experimental data will be pointed out. We directly compare the IR and ARPES α 2 F(ω) and discuss the resonance structure in the spectra in terms of existing theoretical models.

show abstract

Section: Ir-arpes Comparisonmentioning

confidence: 99%

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Dordevic

Homes

et al. 2005

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…So, in the neutron Bragg peaks alone there is no clear difference between the phenomenon in LNSCO and a simple spin-density wave. To determine whether the doped holes are actually involved we have studied LBCO with RSXS near the O K (1s → 2p) and Cu L 3/2 (2p 3/2 → 3d x2−y2 ) edges, which provide direct sensitivity to valence electron ordering [14][15][16][17][18][19][20] .Single crystals of La 2−x Ba x CuO 4 with x = 1/8 were grown by the floating-zone method 21 . The sample used in this study had T c = 2.5 K indicating suppressed superconductivity and stabilized spin/charge order.…”

mentioning

confidence: 99%

“…Single crystals of La 2−x Ba x CuO 4 with x = 1/8 were grown by the floating-zone method 21 . The sample used in this study had T c = 2.5 K indicating suppressed superconductivity and stabilized spin/charge order.…”

mentioning

confidence: 99%

Spatially modulated 'Mottness' in La2-xBaxCuO4

et al. 2005

View full text Add to dashboard Cite

. However, as a neutron is neutral, it does not detect charge but rather its associated lattice distortion 7 , so it is not known whether the stripes involve ordering of the doped holes. Here we present a study of the charge order in LBCO with resonant soft X-ray scattering (RSXS). We observe giant resonances near the Fermi level as well as near the correlated gap 8,9 , demonstrating significant modulation in both the doped-hole density and the 'Mottness', or the degree to which the system resembles a Mott insulator 10 . The peak-to-trough amplitude of the valence modulation is estimated to be 0.063 holes, which suggests 11 an integrated area of 0.59 holes under a single stripe, close to the expected 0.5 for half-filled stripes.The charge/spin superstructure in LNSCO 5 and LBCO 6 appears only in the low-temperature tetragonal (LTT) phase, is most stable at x = 1/8 and coincides with an anomalous suppression of the critical temperature T c (ref. 12). This phase is frequently interpreted as (quasi) static stripes that have been pinned by the LTT distortion. The charge reflections observed with neutron scattering are weak (∼6 times less intense than the magnetic reflections) as neutrons only detect the lattice distortion, which was estimated to be only about 0.004Å (ref. 7). However, one assumes that the hole modulation itself is significant. We point out, however, that the spin-density wave in elemental Cr also exhibits half-wavelength charge reflections that are weaker by about a factor of 4.1 and represent a distortion of similar size 13 . So, in the neutron Bragg peaks alone there is no clear difference between the phenomenon in LNSCO and a simple spin-density wave. To determine whether the doped holes are actually involved we have studied LBCO with RSXS near the O K (1s → 2p) and Cu L 3/2 (2p 3/2 → 3d x2−y2 ) edges, which provide direct sensitivity to valence electron ordering [14][15][16][17][18][19][20] .Single crystals of La 2−x Ba x CuO 4 with x = 1/8 were grown by the floating-zone method 21 . The sample used in this study had T c = 2.5 K indicating suppressed superconductivity and stabilized spin/charge order. The sample was cleaved in air revealing a surface with (0,0,1) orientation. RSXS measurements were performed on beam line X1B at the National Synchrotron Light Source, Brookhaven, using a 10-axis, ultrahigh-vacuumcompatible diffractometer. The sample was cooled with a He flow cryostat connected through Cu braids, providing a base temperature of 18 K. X-ray absorption spectra (XAS) were measured in situ in fluorescence yield mode at the O K and Cu L 3/2 edges and found to be consistent with previous studies 8 (see Figs 1, 3a). We will denote reciprocal space with Miller indices (H,K,L), which represent a momentum transfer Q = (2π/a H,2π/b K,2π/c L) where a = b = 3.788Å, c = 13.23Å. The incident X-ray polarization depends on Q but was approximately 60 • from the Cu-O bond for measurements at both edges.The O K XAS in the cuprates exhibits a mobile carrier peak (MCP) at 528.6 eV, corresponding to tran...

show abstract

“…The Bi 2 Sr 2 CaCu 2 O 8+δ  crystals were grown by the traveling-solvent floating-zone technique [10]. The high quality cleaved single crystals used in the present DBPARL experiment have the dimension of 3 mm × 5 mm × 0.15 mm with optically smooth surfaces.…”

Section: Experimental Outlinementioning

confidence: 99%

Anisotropy of the electron momentum distribution in Bi2Sr2CaCu2O8+δ superconductor studied by positron annihilation

Chakrabarti

Sarkar

Chattapadhayay

et al. 2003

Solid State Communications

View full text Add to dashboard Cite

The temperature dependent (30 K to 300 K) Doppler broadening of the positron annihilated γ-radiation (DBPAR) measurement has been carried out on single crystalline Bi 2 Sr 2 CaCu 2 O 8+δ  (Bi-2212) high T c superconducting sample along two different crystallographic orientations. It has been observed that throughout the temperature range the electron momentum distribution has a relatively large value along the crystallographic c-axis than a-b plane. The temperature dependent DBPARL analysis shows a step like increase of S-parameter at the temperature region 92 K to116 K.

show abstract

Large single crystal Bi-2212 along the c-axis prepared by floating zone method

Cited by 128 publications

References 9 publications

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Spatially modulated 'Mottness' in La2-xBaxCuO4

Anisotropy of the electron momentum distribution in Bi2Sr2CaCu2O8+δ superconductor studied by positron annihilation

Contact Info

Product

Resources

About