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Doping Effects on the two-dimensional Spin Dimer Compound SrCu₂(BO₃)₂

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arxiv cond-mat/0406306 v1 pith:K4ULXAPM submitted 2004-06-14 cond-mat.str-el cond-mat.supr-con

Doping Effects on the two-dimensional Spin Dimer Compound $SrCu_2(BO_3)_2$

G. T. Liu , J. L. Luo , T. Xiang , N. L. Wang , Z. H. Wu , X. N. Jing , D. Jin This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords magneticspinappliedcompoundsdopingfieldsheatspecific
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abstract

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.

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