Pascal Roos

Local magnetic structure due to inhomogeneity of interaction in S=1/2 antiferromagnetic chain (1999)

Nishino, Masamichi, Onishi, Hiroaki, Roos, Pascal, Yamaguchi, Kizashi, Miyashita, Seiji

We study the magnetic properties of $S=1/2$ antiferromagnetic Heisenberg chains with inhomogeneity of interaction. Using a quantum Monte Carlo method and an exact diagonalization method, we study...

Temperature dependence of local states due to S=1/2 impurities and their correlation in a S=1 Heisenberg chain (1998)

Roos, Pascal, Miyashita, Seiji

We study the temperature dependence of the low temperature spin configurations, investigating the magnetization profile of the local states due to the impurities and the two point correlation...