Oxygen deficiency and structural phase transition in (La1−xBax)2CuO4

Takayama‐Muromachi, E.; Izumi, Fujio; Kamiyama, Takumi

doi:10.1016/0921-4534(93)90233-g

Cited by 13 publications

(19 citation statements)

References 21 publications

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“…2 and compared with values of other workers. 2,14,34 Both samples show a diamagnetic response starting at T ϳ30 K; the broad onset for xϭ0.125 has been observed by other workers 2,14 and is attributed to a small fraction ͑few %͒ of the sample becoming superconducting at this temperature. We also show in Fig.…”

Section: B Sample Characterization: Lattice Parameters and T C Measusupporting

confidence: 54%

“…2 and are in good agreement with values reported in the literature. 2,14,33 Superconducting transition temperatures were obtained from dc magnetic susceptibility measurements using a Quantum Design MPMS © superconducting quantum interference device magnetometer. Samples were cooled in zero field ͑ZFC͒ followed by heating in a nominal Hϭ1 Gauss applied field.…”

Section: B Sample Characterization: Lattice Parameters and T C Measumentioning

confidence: 99%

“…2,14,34 Often samples at this composition are de- scribed as ''suppressed superconductors'' or ''nonsuperconducting.'' In fact all samples measured by us show a clear superconducting transition with onset above 2 K. The actual onset temperature varies from a low of Ϸ2.5 K up to the Ϸ10 K for the present sample.…”

Section: B Sample Characterization: Lattice Parameters and T C Measumentioning

confidence: 99%

“…[13][14][15][16] By using this experimental value in their linearized muffin-tin orbital calculations, Norman et al show that the VHS remains nearly intact in the LTT phase while it does split as per PCK when the larger tilt angles are introduced. Since the interaction between octahedral tilts and electrons is quadratic in tilt angle, 11,17 the occurrence of band splitting and related dip in the DOS is very sensitive to its value.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
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Angular dependent x-ray absorption fine structure ͑XAFS͒ measurements of all La, Ba, and Cu sites determined the origin and nature of the intrinsic disorder present in the low temperature tetragonal ͑LTT͒ structural ground state of La 2Ϫx Ba x CuO 4 with xϭ0.125,0.15 at Tϭ10 K. Ba doping induces major local distortions that extend as far as 5 Å from its lattice site. Despite the low Ba content the large distortions significantly affect the XAFS of the majority La and Cu sites. The distribution of the local LTT tilt angle of CuO 6 octahedra was directly determined from single and multiple scattering contributions to the XAFS of La and Cu sites. This angle, which regulates the strength of electron-lattice and spin-spin coupling in this material, was found to exhibit large, random fluctuations with rms ͓͗(Ϫ͗͘) 2 ͔͘ 1/2 Ϸ2͗͘, ͗͘ being the average tilt angle determined by diffraction techniques. These fluctuations originate in the large, random, static disorder introduced with Ba doping. Their presence has implications for the plausibility of a mobility gap causing T c suppression at xϭ0.125 in only the LTT phase, and for the correlation length of the postulated charge and spin stripes.

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Section: B Sample Characterization: Lattice Parameters and T C Measusupporting

confidence: 54%

Section: B Sample Characterization: Lattice Parameters and T C Measumentioning

confidence: 99%

Section: B Sample Characterization: Lattice Parameters and T C Measumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
View full text Add to dashboard Cite

show abstract

“…FEFF6 code, which includes multiple scattering (MS) and polarization (Zabinsky et. al, 1995) was used to obtain theoretical standards based on the average structure determined by diffraction (Takayama et. al, 1993;Katano et.…”

Section: Analysis and Resultsmentioning

confidence: 99%

Structural disorder and the origin of high-T _c suppression in La_1.875Ba_0.125CuO_4−δ

Haskel¹,

Stern²,

Doğan³

et al. 1999

J Synchrotron Radiat

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Polarized x-ray absorption fine structure (XAFS) measurements at all La, Ba and Cu sites were used to study local structural features that accompany the strong Tc suppression at :r ,,, 1/8 in La2_=Ba=CuO4. Two critical parameters regulating the strength of hole-lattice coupling in this material were determined, i.e., the direction and magnitude of CuO6 octahedra local tilts. Our findings include the existence of large disorder in the magnitude of the tilt angle about its average value (0), with an rms ~ ~ 2(0). We suggest that this large disorder strongly scatters a large fraction of states at the Fermi surface for x ,-,, 1/8 leading to the observed Tc suppression.

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Crystal structures of Copper‐Based High‐T_c Superconductors

Aranda

1994

Advanced Materials

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Many copper‐oxide‐based superconducting compounds have been synthesized in recent years–currently more than 30 families are known, with superconducting transition temperatures up to 133 K. The structures of the various families are described, including La2CuO4, YBa2Cu3O7, single‐layer superconductors, double‐layer superconductors, and infinite layer materials (e.g., CaCuO2, as in the Figure).

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Oxygen deficiency and structural phase transition in (La1−xBax)2CuO4

Cited by 13 publications

References 21 publications

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
View full text Add to dashboard Cite

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
View full text Add to dashboard Cite

Structural disorder and the origin of high-T _c suppression in La_1.875Ba_0.125CuO_4−δ

Crystal structures of Copper‐Based High‐T_c Superconductors

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Oxygen deficiency and structural phase transition in (La1−xBax)2CuO4

Cited by 13 publications

References 21 publications

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuOHaskel1, Stern2, Doğan3 et al. 2000Phys. Rev. B527440View full textAdd to dashboardCite

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuOHaskel1, Stern2, Doğan3 et al. 2000Phys. Rev. B527440View full textAdd to dashboardCite

Structural disorder and the origin of high-T c suppression in La1.875Ba0.125CuO4−δ

Crystal structures of Copper‐Based High‐Tc Superconductors

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XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
View full text Add to dashboard Cite

XAFS study of the low-temperature tetragonal phase ofLa2−xBaxCuO
Haskel
¹
,
Stern
²
,
Doğan
³

et al. 2000
Phys. Rev. B
52
7
44
0
View full text Add to dashboard Cite

Structural disorder and the origin of high-T _c suppression in La_1.875Ba_0.125CuO_4−δ

Crystal structures of Copper‐Based High‐T_c Superconductors