Dilatometric studies on single crystalline barlowite – a structurally perfect spin-1/2 Kagome system

  • We present results of high-resolution thermal expansion measurements on single crystalline barlowite – a structurally perfect spin-1/2 kagome system. The data reveal strongly pronounced and anisotropic second-order phase transition anomalies at the Néel transition at TN = 16K. From these data, together with literature results on the specific heat, the uniaxial-pressure dependences of TN are derived. We find a rather large positive pressure coefficient for uniaxial pressure along the hexagonal c axis of ∂TN/∂pc = (2.3 ± 0.2) K/GPa and smaller negative in-plane pressure coefficient of ∂TN/∂pin-plane = -(0.6 ± 0.03) K/GPa. These effects result in a small positive pressure coefficient under hydrostatic-pressure conditions of ∂TN/∂phydr = (1.1 ± 0.2) K/GPa. Bond-lengths considerations indicate that inter-layer Cu-O bonds, being larger than those typically found in stable Cu-O complexes, are responsible for this behavior.

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Author:Elena Aurelia GatiORCiDGND, Bernd WolfORCiDGND, John A. Schlueter, Michael Lang
Parent Title (English):Physics procedia
Place of publication:Amsterdam
Document Type:Article
Year of Completion:2015
Year of first Publication:2015
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Contributing Corporation:International Conference on Microelectronics (20. : 2015 : Barcelona)
Release Date:2023/10/27
Tag:Kagome systems; magnetic frustration; thermodynamic properties
Page Number:8
First Page:597
Last Page:604
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International