TY  - JOUR
A1  - Gati, Elena Aurelia
A1  - Wolf, Bernd
A1  - Schlueter, John A.
A1  - Lang, Michael
T1  - Dilatometric studies on single crystalline barlowite – a structurally perfect spin-1/2 Kagome system
T2  - Physics procedia
N2  - 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.
KW  - Kagome systems
KW  - magnetic frustration
KW  - thermodynamic properties
Y1  - 2015
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/75926
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-759267
SN  - 1875-3892
VL  - 75
SP  - 597
EP  - 604
PB  - Elsevier
CY  - Amsterdam
ER  -