Valenti, R. ; Saha-Dasgupta, T. ; Jeschke, H. O. ; Rahaman, B. ; Rosner, H. ; Lemmens, P. ; Takagi, R. ; Johnsson, M. (2007) Comparative investigation of the coupled-tetrahedra quantum spin systems Cu2Te2O5X2, X= Cl, Br and Cu4Te5O12Cl4 Physica C: Superconductivity, 460-462 (1). pp. 462-463. ISSN 0921-4534
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.physc.2007.03.255
Abstract
We present a comparative study of the coupled-tetrahedra quantum spin systems Cu2Te2O5X2, X = Cl, Br (Cu-2252(X)) and the newly synthesized Cu4Te5O12Cl4 (Cu-45124(Cl)) based on ab initio density functional theory calculations. The magnetic behavior of Cu-45124(Cl) with a phase transition to an ordered state at a lower critical temperature Tc = 13.6 K than in Cu-2252(Cl) (Tc = 18.2 K) can be well understood in terms of the modified interaction paths. We identify the relevant structural changes between the two systems and discuss the hypothetical behavior of the not yet synthesized Cu-45124(Br) with an ab initio relaxed structure using Car-Parrinello molecular dynamics.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Spin Frustration; Density Functional Theory; Quantum Antiferromagnets |
| ID Code: | 65102 |
| Deposited On: | 15 Oct 2011 11:59 |
| Last Modified: | 15 Oct 2011 11:59 |
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