High-field NMR study of field-induced states in Pb(TiO)Cu$_4$(PO$_4$)$_4$

TL;DR

This study uses high-field NMR to investigate magnetic structures in Pb(TiO)Cu$_4$(PO$_4$)$_4$, revealing successive magnetic transitions and proposing high-field magnetic configurations.

Contribution

It extends the field range of NMR measurements up to 32.2 T and analyzes the high-field magnetic states using cluster mean-field theory.

Findings

Detection of double-peak NMR spectra above 29 T indicating magnetic transitions

Proposal of possible magnetic structures for high-field states

Extension of NMR measurement range to 32.2 T

Abstract

The square cupola antiferromagnet Pb(TiO)Cu$_4$(PO$_4$)$_4$ exhibits the intriguing magnetoelectric responses arising from the consecutive change in the magnetic quadrupolar-type configuration of magnetic moments under external magnetic fields higher than 15 T. To clarify the high-field magnetic structures in Pb(TiO)Cu$_4$(PO$_4$)$_4$, an NMR measurement was performed in pulsed fields up to 32.2 T significantly extending the field range accessible by superconducting magnets. The double-peak structure of NMR spectra emerging above 29 T applied along the [001] direction evidences the successive magnetic transitions. The field dependence of NMR spectra was analyzed on the basis of cluster mean-field theory, which allows us to propose possible magnetic structures for the high-field magnetic states.