Details
| Original language | English |
|---|---|
| Pages (from-to) | 471-482 |
| Number of pages | 12 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 219 |
| Issue number | 3-4 |
| Publication status | Published - 15 Jan 1994 |
Abstract
We present new results on the optical absorption of the family of compounds KxBa1 - xBiO3 (KBB) and CsxK0.4 - xBa0.6BiO3 (CKBB) (0 < x < 0.4) using powder methods. All cubic compounds of the KBB system (x ≥ 0.3, Tc ≈ 30 K) possess a broad near- infrared (NIR) absorption band, which appears to evolve on increasing the K dopant content with respect to the noncubic compounds (x < 0.3), which show no Tc. For the series of solid solution with Cs substitution for K (i.e. no change in the nominal charge carrier concentration), we observe a strong increase of the absorption in the visible range with increasing Cs content, simultaneous to the gradual decrease of Tc. The NIR absorption is analysed using the theory for small polaron absorption in disordered media. The results indicate the formation of intersite bipolarons. Characteristic differences in the absorption behaviour with the high-Tc family Bi2Sr2Ca1 - xYxCu2O8 + δ (BSCC) are outlined.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Physica C: Superconductivity and its Applications, Vol. 219, No. 3-4, 15.01.1994, p. 471-482.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Bipolaron absorption in Ba1 - xKxBiO3 and Ba0.6K0.4 - xCsxBiO3
AU - Rüscher, C. H.
AU - Heinrich, A.
AU - Urland, W.
N1 - Funding Information: This work was supported by BMFT F + E 13N5738 and 13N5742.
PY - 1994/1/15
Y1 - 1994/1/15
N2 - We present new results on the optical absorption of the family of compounds KxBa1 - xBiO3 (KBB) and CsxK0.4 - xBa0.6BiO3 (CKBB) (0 < x < 0.4) using powder methods. All cubic compounds of the KBB system (x ≥ 0.3, Tc ≈ 30 K) possess a broad near- infrared (NIR) absorption band, which appears to evolve on increasing the K dopant content with respect to the noncubic compounds (x < 0.3), which show no Tc. For the series of solid solution with Cs substitution for K (i.e. no change in the nominal charge carrier concentration), we observe a strong increase of the absorption in the visible range with increasing Cs content, simultaneous to the gradual decrease of Tc. The NIR absorption is analysed using the theory for small polaron absorption in disordered media. The results indicate the formation of intersite bipolarons. Characteristic differences in the absorption behaviour with the high-Tc family Bi2Sr2Ca1 - xYxCu2O8 + δ (BSCC) are outlined.
AB - We present new results on the optical absorption of the family of compounds KxBa1 - xBiO3 (KBB) and CsxK0.4 - xBa0.6BiO3 (CKBB) (0 < x < 0.4) using powder methods. All cubic compounds of the KBB system (x ≥ 0.3, Tc ≈ 30 K) possess a broad near- infrared (NIR) absorption band, which appears to evolve on increasing the K dopant content with respect to the noncubic compounds (x < 0.3), which show no Tc. For the series of solid solution with Cs substitution for K (i.e. no change in the nominal charge carrier concentration), we observe a strong increase of the absorption in the visible range with increasing Cs content, simultaneous to the gradual decrease of Tc. The NIR absorption is analysed using the theory for small polaron absorption in disordered media. The results indicate the formation of intersite bipolarons. Characteristic differences in the absorption behaviour with the high-Tc family Bi2Sr2Ca1 - xYxCu2O8 + δ (BSCC) are outlined.
UR - http://www.scopus.com/inward/record.url?scp=0028196290&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(94)90402-2
DO - 10.1016/0921-4534(94)90402-2
M3 - Article
AN - SCOPUS:0028196290
VL - 219
SP - 471
EP - 482
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -