1 and for fields of up to 9 T. We obtain the heat capacity intrinsic to the kagome layers by accounting for the weak Cu2+/Zn2+ exchange between the Cu and the Zn sites, which was measured independently for x=1 using neutron diffraction. The evolution of the heat capacity for x=0.8...1 is then related to the hysteresis in the magnetic susceptibility. We conclude that for x>0.8 zinc paratacamite is a spin liquid without a spin gap, in which unpaired spins give rise to a macroscopically degenerate ground state manifold with increasingly glassy dynamics as x is lowered.
| Entry Date(s): |
Date Created: 20080604 Date Completed: 20080617 Latest Revision: 20080603 |
| Update Code: |
20231215 |
| DOI: |
10.1103/PhysRevLett.100.157205 |
| PMID: |
18518149 |
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| Autor: |
de Vries MA; CSEC and School of Chemistry, The University of Edinburgh, Edinburgh, United Kingdom., Kamenev KV, Kockelmann WA, Sanchez-Benitez J, Harrison A |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2008 Apr 18; Vol. 100 (15), pp. 157205. Date of Electronic Publication: 2008 Apr 17. |
| DOI: |
10.1103/PhysRevLett.100.157205 |
| Abstrakt: |
We present a detailed analysis of the heat capacity of a near-perfect S=1/2 kagome antiferromagnet, zinc paratacamite Zn(x)Cu(4-x)(OH)(6)Cl(2), as a function of stoichiometry x-->1 and for fields of up to 9 T. We obtain the heat capacity intrinsic to the kagome layers by accounting for the weak Cu2+/Zn2+ exchange between the Cu and the Zn sites, which was measured independently for x=1 using neutron diffraction. The evolution of the heat capacity for x=0.8...1 is then related to the hysteresis in the magnetic susceptibility. We conclude that for x>0.8 zinc paratacamite is a spin liquid without a spin gap, in which unpaired spins give rise to a macroscopically degenerate ground state manifold with increasingly glassy dynamics as x is lowered. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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