Abstract
We establish with angle-resolved photoemission spectroscopy (ARPES) that the electronic structure near the Fermi level of the "misfit" cobaltate [Bi2 Ba2 O4]·[Co O2] ∼2 is similar to that of Na cobaltates Nax Co O2. Both families of compounds contain triangular Co planes but in a different three-dimensional environment. We propose that the peculiar ARPES line shape of all cobaltates is of the "peak-dip-hump" type, due to strong many-body effects. We detect a progressive transfer of spectral weight from the quasiparticle feature near EF to a broad hump in misfit phases where Ba is replaced by Sr or Ca. This indicates stronger many-body interactions in proximity to the band insulator regime, which we attribute to the presence of unusual magnetic excitations.
| Original language | English |
|---|---|
| Article number | 100403 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 76 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2007 Sep 10 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates. / Brouet, V.; Nicolaou, A.; Zacchigna, M.; Tejeda, A.; Patthey, L.; Hébert, S.; Kobayashi, Wataru; Muguerra, H.; Grebille, D.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 10, 100403, 10.09.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates
AU - Brouet, V.
AU - Nicolaou, A.
AU - Zacchigna, M.
AU - Tejeda, A.
AU - Patthey, L.
AU - Hébert, S.
AU - Kobayashi, Wataru
AU - Muguerra, H.
AU - Grebille, D.
PY - 2007/9/10
Y1 - 2007/9/10
N2 - We establish with angle-resolved photoemission spectroscopy (ARPES) that the electronic structure near the Fermi level of the "misfit" cobaltate [Bi2 Ba2 O4]·[Co O2] ∼2 is similar to that of Na cobaltates Nax Co O2. Both families of compounds contain triangular Co planes but in a different three-dimensional environment. We propose that the peculiar ARPES line shape of all cobaltates is of the "peak-dip-hump" type, due to strong many-body effects. We detect a progressive transfer of spectral weight from the quasiparticle feature near EF to a broad hump in misfit phases where Ba is replaced by Sr or Ca. This indicates stronger many-body interactions in proximity to the band insulator regime, which we attribute to the presence of unusual magnetic excitations.
AB - We establish with angle-resolved photoemission spectroscopy (ARPES) that the electronic structure near the Fermi level of the "misfit" cobaltate [Bi2 Ba2 O4]·[Co O2] ∼2 is similar to that of Na cobaltates Nax Co O2. Both families of compounds contain triangular Co planes but in a different three-dimensional environment. We propose that the peculiar ARPES line shape of all cobaltates is of the "peak-dip-hump" type, due to strong many-body effects. We detect a progressive transfer of spectral weight from the quasiparticle feature near EF to a broad hump in misfit phases where Ba is replaced by Sr or Ca. This indicates stronger many-body interactions in proximity to the band insulator regime, which we attribute to the presence of unusual magnetic excitations.
UR - http://www.scopus.com/inward/record.url?scp=34548733058&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548733058&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.76.100403
DO - 10.1103/PhysRevB.76.100403
M3 - Article
AN - SCOPUS:34548733058
VL - 76
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 10
M1 - 100403
ER -