Spin Seebeck effect in quantum magnet Pb2V3O9

TL;DR

This study investigates the spin Seebeck effect in the quantum magnet Pb2V3O9, revealing its temperature and magnetic field dependence and linking it to quantum phase transitions, thus demonstrating the potential of spin current as a probe.

Contribution

First detailed analysis of the spin Seebeck effect in a spin-gapped quantum magnet Pb2V3O9, connecting spin current behavior to quantum phase transitions.

Findings

SSE observed in Pb2V3O9 with temperature-dependent behavior

Critical magnetic fields correlate with Bose-Einstein condensation phase

Spin current can probe spin correlations and phase transitions

Abstract

Spin Seebeck effect (SSE), the generation of spin current from heat, has been extensively studied in a large variety of magnetic materials, including ferromagnets, antiferromagnets, paramagnets, and quantum spin liquids. In this paper, we report the study of the SSE in the single crystalline Pb2V3O9, a spin-gapped quantum magnet candidate with quasi-one-dimensional spin-1/2 chain. Detailed temperature and magnetic field dependences of the SSE are investigated, and the temperature-dependent critical magnetic fields show a strong correlation to the Bose-Einstein condensation phase of the quantum magnet Pb2V3O9. This work shows the potential of using spin current as a probe to study the spin correlation and phase transition properties in quantum magnets.