The transition from finite to infinite measures in dynamical systems
The extracellular matrix in aging, exercise and in the tumor microenvironment
Internal fault transients analysis and protection of wind generators
| Full text | |
| Author(s): |
Paduan-Filho, A.
;
Vieira, A. P.
;
Ramon, J. G. A.
;
Freitas, R. S.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF PHYSICS-CONDENSED MATTER; v. 28, n. 50 DEC 21 2016. |
| Web of Science Citations: | 0 |
| Abstract | |
From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-1D antiferromagnet Cu(N2H5)(2)(SO4)(2). On cooling and at zero magnetic field this compound enters a 1D regime with short-range magnetic correlations, marked by a broad maximum in the specific heat and magnetic susceptibility at T-max similar to 2 K, followed by a tridimensional antiferromagnetically ordered phase below T-N similar to 1 K induced by small interchain couplings. The intermediate-temperature 1D regime can be modeled using exact quantum-transfer-matrix calculations, which offer a compatible description of the nonmonotonic behavior of T-max as a function of the magnetic field, giving J = 4.25 K for the intrachain exchange parameter. The analysis of magnetic specific-heat and susceptibility data at low temperature indicates that the interchain exchange couplings are an order of magnitude smaller than the coupling inside the chains. (AU) | |
| FAPESP's process: | 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures |
| Grantee: | Gennady Gusev |
| Support Opportunities: | Research Projects - Thematic Grants |