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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

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Strong magnetic instability in correlated metallic Bi2Ir2O7.

T F Qi¹, O B Korneta, Xiangang Wan

¹Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, KY 40506, USA.

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|August 2, 2012

Summary

Single-crystal Bi(2)Ir(2)O(7) exhibits a metallic state with enhanced paramagnetism. Its unconventional properties suggest an exotic ground state, with no magnetic order observed at low temperatures.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Chemistry

Background:

Bismuth iridates (Bi2Ir2O7) are pyrochlore oxides with potential for novel electronic properties.
Understanding the ground state of these materials is crucial for exploring their potential applications.

Purpose of the Study:

To experimentally and theoretically investigate the ground state properties of single-crystal Bi(2)Ir(2)O(7).
To characterize the magnetic and electronic behavior of Bi(2)Ir(2)O(7) at low temperatures.

Main Methods:

Experimental measurements of magnetic susceptibility, specific heat, and Hall resistivity.
Theoretical analysis of the electronic and magnetic properties.

Main Results:

Observed a metallic state with strongly exchange-enhanced paramagnetism.
No long-range magnetic order detected down to 50 mK, indicated by divergent magnetic susceptibility.
Specific heat showed strongly field-dependent coefficients for T and T(3) terms.
A large Wilson ratio (RW ≈ 53.5) was calculated.
Unusual temperature and field dependences of Hall resistivity were observed below 80 K.

Conclusions:

The unconventional properties of Bi(2)Ir(2)O(7) suggest the presence of an exotic ground state.
Further research is needed to fully understand the nature of this ground state and its implications.