Nonanalytic momentum dependence of spin susceptibility for Heisenberg magnets in the paramagnetic phase and its effect on critical exponents

نویسندگان

چکیده

We study momentum dependence of static magnetic susceptibility $\chi(q)$ in paramagnetic phase Heisenberg magnets and its relation to critical behavior within nonlinear sigma model (NLSM) at arbitrary dimension $25/2$. Using NLSM, obtain contribution the"anomalous" term $\xi^{-2}f(q\xi )$ exponent $\nu $, comparing it non-analytical dependence, originating $\eta (the obtained exponents agree studies). range $3\leq d<4$ that former dominates, fully determines correction limit $d\rightarrow 4.$

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ژورنال

عنوان ژورنال: Physical review

سال: 2021

ISSN: ['0556-2813', '1538-4497', '1089-490X']

DOI: https://doi.org/10.1103/physrevb.103.054415