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Isotope effect in quasi-two-dimensional metal-organic antiferromagnets | | P. A. Goddard
; J. Singleton
; C. Maitland
; S. J. Blundell
; T. Lancaster
; P. J. Baker
; R. D. McDonald
; S. Cox
; P. Sengupta
; J. L. Manson
; H. I. Southerland
; J. A. Schlueter
; | | Date: |
Wed, 9 Jul 2008 17:47:20 GMT (1827kb,D) | | Abstract: | Although the isotope effect in superconducting materials is well-documented,
changes in the magnetic properties of antiferromagnets due to isotopic
substitution are seldom discussed and remain poorly understood. This is perhaps
surprising given the possible link between the quasi-two-dimensional (Q2D)
antiferromagnetic and superconducting phases of the layered cuprates. Here we
report the experimental observation of shifts in the N’{e}el temperature and
critical magnetic fields ($Delta T_{
m N}/T_{
m N}approx 4%$; $Delta
B_{
m c}/B_{
m c}approx 4%$) in a Q2D organic molecular antiferromagnets on
substitution of hydrogen for deuterium. These compounds are characterized by
strong hydrogen bonds through which the dominant superexchange is mediated. We
evaluate how the in-plane and inter-plane exchange energies evolve as the
hydrogens on different ligands are substituted, and suggest a possible
mechanism for this effect in terms of the relative exchange efficiency of
hydrogen and deuterium bonds. | | Source: | arXiv, 0807.1506 | | Services: | Forum | Review | PDF | Favorites | |
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