Re-entrant magnetic field induced charge and spin gaps in the coupled dual-chain quasi-one dimensional organic conductor Perylene$_2$[Pt(mnt)$_2$]

TL;DR

This study investigates how re-entrant magnetic fields induce charge and spin gaps in a dual-chain organic conductor, revealing strong coupling between charge density wave and spin-Peierls states under high magnetic fields.

Contribution

It provides new experimental evidence of magnetic field-induced phases and the coupling of charge and spin order parameters in a dual-chain organic conductor.

Findings

Coexistence of SP-CDW state below 8 K and 20 T

Appearance of a second spin-gapped phase above 20 T

Strong coupling of charge and spin order parameters in high magnetic fields

Abstract

An inductive method is used to follow the magnetic field-dependent susceptibility of the coupled charge density wave (CDW) and spin-Peierls (SP) ordered state behavior in the dual chain organic conductor Perylene$_2$[Pt(mnt)$_2$]. In addition to the coexisting SP-CDW state phase below 8 K and 20 T, the measurements show that a second spin-gapped phase appears above 20 T that coincides with a field-induced insulating phase. The results support a strong coupling of the CDW and SP order parameters even in high magnetic fields, and provide new insight into the nature of the magnetic susceptibility of dual-chain spin and charge systems.