Doping Effects on the two-dimensional Spin Dimer Compound $SrC{u}_2(B{O}_3{)}_2$

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.

5 pages, 5 figurs

References in corpus (4)

• Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2
• $SrC{u}_2(B{O}_3{)}_2$: A Unique Mott Hubbard Insulator
• Competing Orders and Superconductivity in the Doped Mott Insulator on the Shastry-Sutherland Lattice
• Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice

Cited by in corpus (7)

• Continuous and Discontinuous Quantum Phase Transitions in a Model Two-Dimensional Magnet
• In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu(2-x)Mgx(BO3)2
• Emergent Bound States and Impurity Pairs in Chemically Doped Shastry-Sutherland System
• Quantum phases in a doped Mott insulator on the Shastry-Sutherland lattice
• Decorated Shastry-Sutherland lattice in the spin-1/2 magnet CdCu2(BO3)2
• Impurity-induced singlet breaking in SrCu2(BO3)2
• In-plane substitution effect on the magnetic properties of two-dimensional Spin-gap system SrCu${}_2$(BO${}_3$)${}_2$