Low-temperature behavior of a Magnetic Impurity in a Heisenberg Chain

TL;DR

This paper investigates how a spin-1/2 magnetic impurity affects the low-temperature properties of a Heisenberg chain, revealing anomalous behaviors in specific heat and susceptibility.

Contribution

It applies bosonization to analyze impurity effects, providing new insights into low-temperature anomalies in quantum spin chains.

Findings

Impurity specific heat shows anomalous temperature dependence.

Spin susceptibility exhibits unusual behavior at low temperatures.

Bosonization effectively captures impurity effects in Heisenberg chains.

Abstract

Using the bosonization technique, we have studied a spin-1/2 magnetic impurity in Heisenberg chain, and shown that the impurity specific heat and spin susceptibility have an anomalous temperature dependence.