Magnetic properties of spin-orbital polarons in lightly doped cobaltates

被引：29

作者：

Daghofer, M. ^{[1
]}

Horsch, P. ^{[1
]}

Khaliullin, G. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.96.216404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a numerical treatment of a spin-orbital-polaron model for NaxCoO2 at small hole concentration (0.7 < x < 1). We demonstrate how the polarons account for the peculiar magnetic properties of this layered compound: They explain the large susceptibility; their internal degrees of freedom lead both to a negative Curie-Weiss temperature and yet to a ferromagnetic intralayer interaction, thereby resolving a puzzling contradiction between these observations. We make specific predictions on the momentum and energy location of excitations resulting from the internal degrees of freedom of the polaron, and discuss their impact on spin-wave damping.

引用

页数：4

共 18 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] Bulk antiferromagnetism in Na0.82CoO2 single crystals -: art. no. 100410 [J].

Bayrakci, SP ;

Bernhard, C ;

Chen, DP ;

Keimer, B ;

Kremer, RK ;

Lemmens, P ;

Lin, CT ;

Niedermayer, C ;

Strempfer, J .

PHYSICAL REVIEW B, 2004, 69 (10)

[3] Charge ordering and magnetopolarons in Na0.82CoO2 -: art. no. 167003 [J].

Bernhard, C ;

Boris, AV ;

Kovaleva, NN ;

Khaliullin, G ;

Pimenov, AV ;

Yu, L ;

Chen, DP ;

Lin, CT ;

Keimer, B .

PHYSICAL REVIEW LETTERS, 2004, 93 (16) :167003-1

[4] 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

[5] High-temperature thermoelectric properties of NaxCoO2-δ single crystals [J].

Fujita, K ;

Mochida, T ;

Nakamura, K .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2001, 40 (07) :4644-4647

[6] Unconventional charge ordering in Na0.70CoO2 below 300 K -: art. no. 100404 [J].

Gavilano, JL ;

Rau, D ;

Pedrini, B ;

Hinderer, J ;

Ott, HR ;

Kazakov, SM ;

Karpinski, J .

PHYSICAL REVIEW B, 2004, 69 (10)

[7] Fermi surface and quasiparticle dynamics of Na0.7CoO2 investigated by angle-resolved photoemission spectroscopy -: art. no. 246402 [J].

Hasan, MZ ;

Chuang, YD ;

Qian, D ;

Li, YW ;

Kong, Y ;

Kuprin, A ;

Fedorov, AV ;

Kimmerling, R ;

Rotenberg, E ;

Rossnagel, K ;

Hussain, Z ;

Koh, H ;

Rogado, NS ;

Foo, ML ;

Cava, RJ .

PHYSICAL REVIEW LETTERS, 2004, 92 (24) :246402-1

[8] Three-dimensional spin fluctuations in Na0.75CoO2 -: art. no. 157206 [J].

Helme, LM ;

Boothroyd, AT ;

Coldea, R ;

Prabhakaran, D ;

Tennant, DA ;

Hiess, A ;

Kulda, J .

PHYSICAL REVIEW LETTERS, 2005, 94 (15)

[9]

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

[10] Orbital polarons in the metal-insulator transition of manganites [J].

Kilian, R ;

Khaliullin, G .

PHYSICAL REVIEW B, 1999, 60 (19) :13458-13469

← 1 2 →