Low-dimensional magnetism in the mixed Cr valence spin-chain compound Sr_4Cr_3O_9
| dc.creator | Singh, Yogesh | |
| dc.creator | johnston, D. C. | |
| dc.date | 2008-08-22 | |
| dc.date.accessioned | 2026-07-07T09:58:06Z | |
| dc.date.available | 2026-07-07T09:58:06Z | |
| dc.description | Sr_4Cr_3O_9 is the n = 2 member of a family of quasi-one-dimensional compounds A_{n+2}T_{n+1}O_{3n+3} (A = Ca, Sr, or Ba, T = transition metal, and n = 1 to \infty) having a crystal structure which consists of chains of n TO_6 octahedra alternated by one TO_6 trigonal prism running along the c-axis. The chains are arranged on a triangular lattice in the ab-plane. We report the synthesis, structure, magnetization M versus magnetic field H, magnetic susceptibility χversus temperature T and specific heat C versus T measurements on sintered and arc-melted polycrystalline samples of Sr_4Cr_3O_9. The χdata have a T dependence which is typical of low-dimensional magnetic systems with dominant antiferromagnetic (AF) exchange interactions. Specifically, χ(T) shows a broad maximum at T_{max} \approx 200K for the sintered pellet and T_{max}\approx 265K for the arc-melted sample, indicating the onset of short-range magnetic order. Below T = 15K we observe 2 anomalies in the χ(T) data for both samples suggesting the onset of long-range magnetic ordering. The corresponding anomalies in the C(T) data however are weak indicating that only a small amount of the expected magnetic entropy is recovered at the magnetic transitions and that strong short-range AF order exists above these temperatures. | |
| dc.description | 6 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/0808.3123 | |
| dc.identifier | http://arxiv.org/abs/0808.3123 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/167594 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Materials Science | |
| dc.title | Low-dimensional magnetism in the mixed Cr valence spin-chain compound Sr_4Cr_3O_9 | |
| dc.type | text |