Magnetic order in the quasi-one-dimensional spin 1/2 chain, copper pyrazine dinitrate

TL;DR

This study provides the first experimental evidence of magnetic order in a quasi-one-dimensional spin 1/2 chain compound, copper pyrazine dinitrate, revealing long-range order at very low temperatures through muon-spin relaxation measurements.

Contribution

First demonstration of magnetic order in copper pyrazine dinitrate using muon-spin relaxation, establishing the interchain coupling and ordering temperature in this quasi-one-dimensional system.

Findings

Magnetic order observed below 107 mK.

Interchain coupling constant estimated as |J'|/k_B=0.046 K.

Ratio of interchain to intrachain coupling is 4.4 x 10^-3.

Abstract

We present the first evidence of magnetic order in the quasi-one-dimensional spin 1/2 molecular chain compound, copper pyrazine dinitrate Cu(C4H4N2)(NO3)2}. Zero field muon-spin relaxation measurements made at dilution refrigerator temperatures show oscillations in the measured asymmetry, characteristic of a quasistatic magnetic field at the muon sites. Our measurements provide convincing evidence for long range magnetic order below a temperature T_N=107(1) mK. This leads to an estimate of the interchain coupling constant of |J'|/k_B=0.046 K and to a ratio |J'/J| = 4.4 x 10^-3.