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Sliding density wave in Sr14Cu24O41 ladder compounds
G Blumberg1, P Littlewood, A Gozar
1Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA. girsh@bell-labs.com
Science (New York, N.Y.)
|July 27, 2002
Summary
The insulating state in Sr14Cu24O41 is a sliding density wave. This state exhibits nonlinear conductivity and a large dielectric response at high temperatures.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Sr14Cu24O41 is a material known for its complex electronic properties.
- Understanding the insulating state is crucial for exploring novel electronic phenomena.
Purpose of the Study:
- To identify the nature of the insulating state in self-doped spin (1/2) two-leg ladders of Sr14Cu24O41.
- To characterize the electronic transport and dielectric properties of this material.
Main Methods:
- Transport measurements were employed to probe electrical conductivity.
- Raman scattering measurements were utilized to investigate lattice and electronic excitations.
Main Results:
- The insulating state was identified as a weakly pinned, sliding density wave.
- Nonlinear conductivity was observed, indicating a threshold for charge motion.
- A giant dielectric response was detected and found to persist to high temperatures.
Conclusions:
- The findings reveal a unique charge transport mechanism in Sr14Cu24O41.
- The sliding density wave state contributes to the material's unusual dielectric properties.
- The persistence of these properties at high temperatures suggests potential applications in advanced electronic devices.
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