Competing Orders and Superconductivity in the Doped Mott Insulator on the Shastry-Sutherland Lattice

Chung-Hou Chung; Yong Baek Kim

doi:10.1103/PhysRevLett.93.207004

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Competing Orders and Superconductivity in the Doped Mott Insulator on the Shastry-Sutherland Lattice

Chung-Hou Chung, Yong Baek Kim

DOI 10.1103/PhysRevLett.93.207004 · Physical Review Letters

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Abstract

Quantum antiferromagnets on geometrically frustrated lattices often allow a number of unusual paramagnetic ground states. The fate of these Mott insulators upon doping is an important issue that may shed some light on the high Tc cuprate problem. We consider the doped Mott insulator on the Shastry-Sutherland lattice via the t-J model. The U(1) slave-boson mean-field theory reveals the strong competition between different broken symmetry states. It is found that, in some ranges of doping, there exist superconducting phases with or without coexisting translational-symmetry-breaking orders such as the staggered flux or dimerization. Our results will be directly relevant to SrCu2(BO3)2 when this material is doped in future.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrCu2(BO3)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NaxCoO2*yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Cs2CuCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown