Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-14
Phys. Rev. B 71, 014441 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figurs
Scientific paper
10.1103/PhysRevB.71.014441
A series of compounds M$_{0.1}$Sr$_{0.9}$Cu$_2$(BO$_3$)$_2$ with Sr substituted by M=Al, La, Na and Y were prepared by solid state reaction. XRD analysis showed that these doping compounds are isostructural to SrCu$_2$(BO$_3$)$_2$. The magnetic susceptibility from 1.9K to 300K in an applied magnetic field of 1.0T and the specific heat from 1.9K to 25K in applied fields up to 14T were measured. The spin gap is deduced from the low temperature susceptibility as well as the specific heat. It is found that the spin gap is strongly suppressed by magnetic fields. No superconductivity is observed in all four samples.
Jin Dapeng
Jing X. N.
Liu Guo-Tao
Luo Jian-Lin
Wang Nan-Lin
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