Magnetic properties of the S=1/2 distorted diamond chain at T=0

Magnetic properties of the S=1/2 distorted diamond chain at T=0
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DOI:
10.1088/0953-8984/15/35/307
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发表时间:
2003-09-10
影响因子:
2.7
通讯作者:
Kaburagi, M
Kaburagi, M
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Okamoto, K;Tonegawa, T;Kaburagi, M

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我们研究了T = 0时S = 1/2反铁磁畸变金刚石链的磁性,其哈密顿量H = Sigma(j=1)(N/3){J(1)(S3 j-1). S-3j + S-3j。S(3j +1)+ J(2)S(3j+1)。S3j+2 + J(3)(S3j-1 . S-3j + S-3j。S_(3 j +2)} - H σ(1 =1)(N)S_(1 - 1)(z),其中J(1 ′),J(2),J(3)大于或等于0,它模拟了所有的A(3)Cu(3)(PO_4)(4),其中A = Ca,Sr,Bi_4Cu_3V_2 O_(14)和蓝铜矿Cu_3(OH)(2)(CO_3)(2)。我们采用的物理考虑,简并微扰理论,能级谱分析的数值对角化数据得到的Lanczos方法和密度矩阵重整化群(DMRG)方法。我们研究了M = M-s/3和(2/3)M-s处的磁化平台的机制,并给出了与这些磁化平台有关的(J(2)/J(1),J(3)/J(1))平面的精确相图,其中M = Sigma(1 =1)(N)S-l(z),M-s是饱和磁化强度。我们还计算了磁化曲线和磁化相图的DMRG方法。
We explore, at T = 0, the magnetic properties of the S = 1/2 antiferromagnetic distorted diamond chain described by the Hamiltonian H = Sigma(j=1)(N/3) {J(1)(S3j-1 . S-3j + S-3j . S3j+1) + J(2)S(3j+1) . S3j+2 + J(3) (S3j-1 . S-3j + S-3j . S3j+2)} - H Sigma(l=1)(N) S-l(z) wiht J(1'), J(2), J(3) greater than or equal to 0, which models all A(3)Cu(3) (PO4)(4) with A = Ca, Sr, Bi4Cu3V2O14 and azurite Cu-3(OH)(2)(CO3)(2). We employ the physical consideration, degenerate perturbation theory, level spectroscopy analysis of the numerical diagonalization data obtained by the Lanczos method and also the density matrix renormalization group (DMRG) method. We investigate the mechanisms of the magnetization plateaux at M = M-s/3 and (2/3)M-s, and also show the precise phase diagrams of the (J(2)/J(1), J(3)/J(1)) plane concerned with these magnetization plateaux, where M = Sigma(l=1)(N) S-l(z) and M-s is the saturation magnetization. We also calculate the magnetization curves and the magnetization phase diagrams by means of the DMRG method.