Adiabatic Landau-Zener-St\"uckelberg transition with or without dissipation in low spin molecular system V15

TL;DR

This paper investigates the adiabatic Landau-Zener-Stückelberg transitions in the V15 molecular spin system, examining effects of dissipation and thermal coupling on spin dynamics and tunneling phenomena.

Contribution

It demonstrates control over phonon-bottleneck effects and explores spin transitions with varying thermal couplings and dissipation in a low-spin molecular system.

Findings

Controlled phonon-bottleneck phenomena in V15.

Achieved adiabatic spin transitions under different thermal conditions.

Discussed the origin of zero-field tunneling splitting.

Abstract

The spin one half molecular system V15 shows no barrier against spin reversal. This makes possible direct phonon activation between the two levels. By tuning the field sweeping rate and the thermal coupling between sample and thermal reservoir we have control over the phonon-bottleneck phenomena previously reported in this system. We demonstrate adiabatic motion of molecule spins in time dependent magnetic fields and with different thermal coupling to the cryostat bath. We also discuss the origin of the zero-field tunneling splitting for a half-integer spin.