Quantum phase transition in quasi-one-dimensional BaRu6O12.
2003
We report the first systematic study of the electrical transport and magnetic properties of BaRu 6 O 1 2 , which has a quasi-one-dimensional (quasi- 1D) hollandite structure. We show that BaRu 6 O 1 2 is quasi-1D electronically as well. Its physical properties were found to be extremely sensitive to disorder. Furthermore, a transition from being metallic with a resistance drop around 2 K to being weakly insulating as the applied magnetic field was increased was also found. We propose that these two features are related to the possible presence of a quantum phase transition in this material system.
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