Diamagnetic Properties of Doped Antiferromagnets

TL;DR

This study investigates the finite-temperature diamagnetic behavior of doped antiferromagnets using numerical simulations of the 2D t-J model, revealing an unusual temperature-dependent transition from diamagnetism to paramagnetism.

Contribution

It provides the first detailed numerical analysis of the temperature-dependent diamagnetic properties of doped antiferromagnets using two complementary methods.

Findings

Diamagnetic susceptibility shows anomalous temperature dependence.

Transition from diamagnetic to paramagnetic behavior occurs at intermediate temperatures.

Results are consistent across different numerical techniques.

Abstract

Finite-temperature diamagnetic properties of doped antiferromagnets as modeled by the two-dimensional t-J model were investigated by numerical studies of small model systems. Two numerical methods were used: the worldline quantum Monte Carlo method with a loop cluster algorithm (QMC) and the finite-temperature Lanczos method (FTLM), yielding consistent results. The diamagnetic susceptibility introduced by coupling of the magnetic field to the orbital current reveals an anomalous temperature dependence, changing character from diamagnetic to paramagnetic at intermediate temperatures.