Intrinsic double-peak structure of the specific heat in low-dimensional quantum ferrimagnets

TL;DR

This paper investigates the unique double-peak structure of the specific heat in low-dimensional quantum ferrimagnets, revealing how dual ferromagnetic and antiferromagnetic features can produce multiple peaks.

Contribution

It introduces a modified spin-wave theory to explain the intrinsic double-peak specific heat structure in low-dimensional quantum ferrimagnets.

Findings

Identification of a potential low-temperature peak in specific heat.

Explanation of the double-peak structure via dual ferromagnetic and antiferromagnetic features.

Development of a modified spin-wave theoretical framework.

Abstract

Motivated by recent magnetic measurements on A3Cu3(PO4)4 (A=Ca,Sr) and Cu(3-Clpy)2(N3)2 (3-Clpy=3-Chloropyridine), both of which behave like one-dimensional ferrimagnets, we extensively investigate the ferrimagnetic specific heat with particular emphasis on its double-peak structure. Developing a modified spin-wave theory, we reveal that ferromagnetic and antiferromagnetic dual features of ferrimagnets may potentially induce an extra low-temperature peak as well as a Schottky-type peak at mid temperatures in the specific heat.