High Pressure Investigation of the Layered Compound Sr_2Cu_2CoO_2(S_<1-x>Se_x)_2
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The electrical properties of the layered transition metal oxychalcogenides Sr<SUB>2</SUB>Cu<SUB>2</SUB>CoO<SUB>2</SUB> (S<SUB>1-x</SUB>Se<SUB>x</SUB>) <SUB>2</SUB> are investigated at ambient and high pressure. Increasing selenium content results in a lattice expansion and a crossover from low dimensional variable range hopping conduction to a power law dependence of resistivity at low temperatures. The application of high pressure drives the system into the insulating region. The effects are discussed in terms of a charge carrier compensation due to cobalt d-states close to the Fermi energy.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 583-585, 1998
The Japan Society of High Pressure Science and Technology