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Dimensional crossover of quantum critical behavior in CeCoIn5
J G Donath1, F Steglich, E D Bauer
1Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
Physical Review Letters
|June 4, 2008
Summary
Researchers investigated quantum criticality in CeCoIn5 using thermal expansion. They observed a crossover scale at the quantum critical point, indicating a change in critical fluctuation dimensionality and potentially quantum criticality type.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Quantum criticality describes phase transitions in quantum materials at absolute zero temperature.
- CeCoIn5 is a heavy fermion compound exhibiting unconventional quantum critical behavior.
Purpose of the Study:
- To investigate the nature of quantum criticality in CeCoIn5.
- To understand the influence of disorder on quantum critical phenomena.
Main Methods:
- Low-temperature thermal expansion measurements of CeCoIn5.
- Analysis of CeCoIn(5-x)Sn(x) alloys to study disorder effects.
Main Results:
- A crossover scale (T*) of approximately 0.3 K was observed at the field-induced quantum critical point (H = 5 T).
- The thermal expansion showed a change from a T(-1) to a T(-1/2) divergence, suggesting a dimensionality crossover in critical fluctuations.
- Disorder in CeCoIn(5-x)Sn(x) shifts this crossover scale (T*) to higher temperatures.
Conclusions:
- The observed crossover indicates a transition from unconventional to conventional quantum criticality in CeCoIn5.
- Disorder plays a significant role in modifying the quantum critical behavior of CeCoIn5.
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