Critical behavior of two-dimensional frustrated spin models with noncollinear order

被引:20
作者
Calabrese, P
Parruccini, P
机构
[1] Scuola Normale Super Pisa, I-56126 Pisa, Italy
[2] Ist Nazl Fis Nucl, I-56126 Pisa, Italy
[3] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy
[4] Ist Nazl Fis Nucl, I-56127 Pisa, Italy
关键词
D O I
10.1103/PhysRevB.64.184408
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the critical behavior of frustrated spin models with noncollinear order in two dimensions, including antiferromagnets on a triangular lattice and fully frustrated antiferromagnets. For this purpose we consider the corresponding O(N) x O(2) Landau-Ginzburg-Wilson (LGW) Hamiltonian and compute the field-theoretic expansion to four loops and determine its large-order behavior. We show the existence of a stable fixed point for the physically relevant cases of two- and three-component spin models. We also give a prediction for the critical exponent eta which is eta = 0.24(6) and eta = 0.29(5) for N = 3 and 2, respectively.
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页数:11
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