Prog. Theor. Phys. Supplement No.145 (2002) pp. 64-67

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Magnetization Plateaus of Frustrated Kondo Necklace Model

— Competition between Quantum Fluctuation and Geometrical Frustration —

Takahiro Yamamoto^* and Chikara Ishii^**

Department of Physics, Science University of Tokyo, Tokyo 162-8601, Japan

(Received January 23, 2002)

Abstract:

The magnetization plateaus of frustrated Kondo necklace model have been studied with use of the bosonization technique and level spectroscopy method. It is shown that the model may show three phases (dimer plateau, Néel plateau and Tomonaga-Luttinger liquid phases) due to competitions among Ising anisotropy Δ, the nearest and next nearest neighbor exchange interactions J₁, J₂. It is shown from bosonization technique that quantum transition between the dimer and Néel plateaus is Gaussian type, while the transition from one of these plateau phases to Tomonaga-Luttinger phase is Brezinskii-Kosterlitz-Thouless type. The phase diagram is constructed on the Δ-J₂/J₁ plane with use of level spectroscopy method, under the condition that the system has a half of the saturation magnetization.

URL : http://ptp.ipap.jp/link?PTPS/145/64/
DOI : 10.1143/PTPS.145.64

^*E-mail: j1200713@ed.kagu.sut.ac.jp
^**E-mail: ishii@rs.kagu.sut.ac.jp

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Citing Article(s) :

Journal of the Physical Society of Japan 72 (2003) pp. 3204-3211 :
Cusp Singularities in the Magnetization Curve of Frustrated Kondo Necklace Model

Takahiro Yamamoto, Rumi Manago, Yoshihiro Mori and Chikara Ishii