# Magnetocaloric effect as a signature of quantum level-crossing for a spin-gapped system

## TL;DR

This study investigates the magnetocaloric effect in a spin-1/2 dimer system, revealing quantum level-crossing signatures through experimental magnetization, specific heat, and entropy analysis, with implications for low-temperature magnetic cooling.

## Contribution

It demonstrates how magnetocaloric effect measurements can identify quantum level-crossings in a spin-gapped system, providing new insights into quantum magnetic phenomena.

## Key findings

- Sign change in magnetic Grueneisen parameter at level-crossing field
- Adiabatic cooling observed at low temperatures
- Energy-level crossover consistent with magnetization and heat data

## Abstract

Recent research dealing with magnetocaloric effect (MCE) study of antiferromagnetic (AFM) low dimensional spin systems have revealed a number of fascinating ground-state crossover characteristics upon application of external magnetic field. Herein, through MCE investigation we have explored field-induced quantum level-crossing characteristics of one such spin system: NH4CuPO4.H2O (NCP), an AFM spin 1/2 dimer. Experimental magnetization and specific heat data are presented and the data have been employed to evaluate entropy, magnetic energy and magnetocaloric properties. We witness a sign change in magnetic Grueneisen parameter across the level-crossing field B_C. An adiabatic cooling is observed at low temperature by tracing the isentropic curves in temperature-magnetic field plane. Energy-level crossover characteristics in NCP interpreted through MCE analysis are well consistent with the observations made from magnetization and specific heat data.