ferromagnetism in a realistic two-band model:: A slave boson study.

被引:31
作者
Frésard, R
Lamboley, M
机构
[1] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland
[2] CNRS, UMR 6508, Lab Crismat, F-14050 Caen, France
[3] Inst Sci Mat & Rayonnement, F-14050 Caen, France
[4] Ecole Polytech Fed Lausanne, Lab Genie Med, PSE A, CH-1015 Lausanne, Switzerland
关键词
D O I
10.1023/A:1013815313109
中图分类号
O59 [应用物理学];
学科分类号
摘要
Using a slave boson representation of multi-band Hubbard models, we investigate a two-band model relevant to layered perovskites in the vicinity of half-filling. Beside the strong influence of the Hund's rule coupling, we obtain that the phase diagram separates into two regions: a weak to moderate coupling region where the effective mass is weakly renormalized, and a strong coupling regime where it is strongly renormalized. The transition between these two regimes is very sharp. It takes place in a (vanishingly) small domain. A ferromagnetic instability in only found in the strongly correlated regime, and is triggered by the Hund's rule coupling. The results are compared to La-doped layered ruthenates.
引用
收藏
页码:1091 / 1105
页数:15
相关论文
共 46 条
[41]   Phenomenology of the superconducting state in Sr2RuO4 [J].
Sigrist, M ;
Agterberg, D ;
Furusaki, A ;
Honerkamp, C ;
Ng, KK ;
Rice, TM ;
Zhitomirsky, ME .
PHYSICA C, 1999, 317 :134-141
[42]   RELATIONSHIP OF SR2RUO4 TO THE SUPERCONDUCTING LAYERED CUPRATES [J].
SINGH, DJ .
PHYSICAL REVIEW B, 1995, 52 (02) :1358-1361
[43]  
Sugano S., 1970, MULTIPLETS TRANSITIO
[44]   Non-perturbative approaches to magnetism in strongly correlated electron systems [J].
Vollhardt, D ;
Blumer, N ;
Held, K ;
Kollar, M ;
Schlipf, J ;
Ulmke, M .
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1997, 103 (02) :283-292
[45]   Impact of magnetic frustration on the Mott transition within a slave-boson mean-field theory [J].
Yang, I ;
Lange, E ;
Kotliar, G .
PHYSICAL REVIEW B, 2000, 61 (04) :2521-2524
[46]   Spin and charge structure factor of the two-dimensional Hubbard model [J].
Zimmermann, W ;
Fresard, R ;
Wolfle, P .
PHYSICAL REVIEW B, 1997, 56 (16) :10097-10104