2012/08/31 by Alexander Barcza, A. Barcza, Z. Gercsi +6
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Density of states #Diffraction #Entropy (arrow of time) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Magnetometer #Magnetostriction #Materials science #Neutron diffraction #Physics #Quantum mechanics #Shape Memory Alloy Transformations #Thermodynamics #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.87.064410
published as Phys. Rev. B 87, 064410 (2013) · 11 pages, 9 figures. Figures 4 and 6 were updated in v2 of this preprint. In v3, figures 1 and 2 have been updated, while Table II and the abstract have been extended. In v4, Table I has updated with relevant neutron diffraction data
arxiv created 2013/02/08 · openalex publication_date 2013/02/08 · arxiv updated 2015/03/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We use neutron diffraction, magnetometry, and low-temperature heat capacity to probe giant magnetoelastic coupling in CoMnSi-based antiferromagnets and to establish the origin of the entropy change that occurs at the metamagnetic transition in such compounds. We find a large difference between the electronic density of states of the antiferromagnetic and high-magnetization states. The magnetic field-induced entropy change is composed of this contribution and a significant counteracting lattice component, deduced from the presence of negative magnetostriction. In calculating the electronic entropy change, we note the importance of using an accurate model of the electronic density of states, which here varies rapidly close to the Fermi energy.