High Field behavior of the Spin Gap compound Sr$_2$Cu(BO$_3$)$_2$

TL;DR

This study investigates the magnetic properties of Sr$_2$Cu(BO$_3$)$_2$, revealing how weak interdimer interactions influence triplet excitations and induce cooperative effects in a spin gap system.

Contribution

It provides new insights into the high-field magnetic behavior and triplet delocalization caused by interdimer coupling in Sr$_2$Cu(BO$_3$)$_2$.

Findings

Intradimer coupling J = 100 K established.

Triplet excitations occur at lower fields than isolated dimer predictions.

Weak interdimer coupling leads to triplet delocalization and cooperative effects.

Abstract

We report magnetization and heat capacity measurements of single crystal samples of the spin gap compound Sr$_2$Cu(BO$_3$)$_2$. Low-field data show that the material has a singlet ground state comprising dimers with intradimer coupling J = 100 K. High field data reveal the role of weak interdimer coupling. For fields that are large compared to the spin gap, triplet excitations are observed for significantly smaller fields than predicted for isolated dimers, indicating that weak inter-dimer coupling leads to triplet delocalization. High field magnetization behavior at low temperatures suggests additional cooperative effects.