Spin polaron theory for the photoemission spectra of layered cobaltates

被引：13

作者：

Chaloupka, Jiri ^{[1
,2
]}

Khaliullin, Giniyat ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Masaryk Univ, Dept Condensed Matter Phys, CS-61137 Brno, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.99.256406

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recently, strong reduction of the quasiparticle peaks and pronounced incoherent structures have been observed in the photoemission spectra of layered cobaltates. Surprisingly, these many-body effects are found to increase near the band-insulator regime. We explain these unexpected observations in terms of a novel spin-polaron model for CoO(2) planes, which is based on a fact of the spin-state quasidegeneracy of Co(3+) ions in oxides. Scattering of the photoholes on spin-state fluctuations suppresses their coherent motion. The observed "peak-dip-hump" type line shapes are well reproduced by the theory.

引用

页数：4

共 23 条

[1] Magnetic ordering and spin waves in Na0.82CoO2 -: art. no. 157205 [J].

Bayrakci, SP ;

Mirebeau, I ;

Bourges, P ;

Sidis, Y ;

Enderle, M ;

Mesot, J ;

Chen, DP ;

Lin, CT ;

Keimer, B .

PHYSICAL REVIEW LETTERS, 2005, 94 (15)

[2] Interplay between magnetic properties and thermoelectricity in misfit and Na cobaltates [J].

Bobroff, J. ;

Herbert, S. ;

Lang, G. ;

Mendels, P. ;

Pelloquin, D. ;

Maignan, A. .

PHYSICAL REVIEW B, 2007, 76 (10)

[3] Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates [J].

Brouet, V. ;

Nicolaou, A. ;

Zacchigna, M. ;

Tejeda, A. ;

Patthey, L. ;

Hebert, S. ;

Kobayashi, W. ;

Muguerra, H. ;

Grebille, D. .

PHYSICAL REVIEW B, 2007, 76 (10)

[4] Magnetic properties of spin-orbital polarons in lightly doped cobaltates [J].

Daghofer, M. ;

Horsch, P. ;

Khaliullin, G. .

PHYSICAL REVIEW LETTERS, 2006, 96 (21)

[5] Electronic correlations in CoO2, the parent compound of triangular cobaltates [J].

De Vaulx, C. ;

Julien, M.-H. ;

Berthier, C. ;

Hebert, S. ;

Pralong, V. ;

Maignan, A. .

PHYSICAL REVIEW LETTERS, 2007, 98 (24)

[6] Nonmagnetic insulator state in Na1CoO2 and phase separation of Na vacancies -: art. no. 186405 [J].

de Vaulx, C ;

Julien, MH ;

Berthier, C ;

Horvatic, M ;

Bordet, P ;

Simonet, V ;

Chen, DP ;

Lin, CT .

PHYSICAL REVIEW LETTERS, 2005, 95 (18)

[7] Charge ordering, commensurability, and metallicity in the phase diagram of the layered NaxCoO2 -: art. no. 247001 [J].

Foo, ML ;

Wang, YY ;

Watauchi, S ;

Zandbergen, HW ;

He, T ;

Cava, RJ ;

Ong, NP .

PHYSICAL REVIEW LETTERS, 2004, 92 (24) :247001-1

[8] Spin state transition in LaCoO3 studied using soft x-ray absorption spectroscopy and magnetic circular dichroism [J].

Haverkort, M. W. ;

Hu, Z. ;

Cezar, J. C. ;

Burnus, T. ;

Hartmann, H. ;

Reuther, M. ;

Zobel, C. ;

Lorenz, T. ;

Tanaka, A. ;

Brookes, N. B. ;

Hsieh, H. H. ;

Lin, H. -J. ;

Chen, C. T. ;

Tjeng, L. H. .

PHYSICAL REVIEW LETTERS, 2006, 97 (17)

[9] MOTION OF A SINGLE HOLE IN A QUANTUM ANTIFERROMAGNET [J].

KANE, CL ;

LEE, PA ;

READ, N .

PHYSICAL REVIEW B, 1989, 39 (10) :6880-6897

[10]

Khaliullin G, 2005, PROG THEOR PHYS SUPP, P155, DOI 10.1143/PTPS.160.155

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