【摘 要】
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We report a comprehensive high-pressure study on the monoclinic TlFeSe2 single crystal,which is an antiferromagnetic insulator with quasi-one-dimensional crysta
【机 构】
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Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of
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We report a comprehensive high-pressure study on the monoclinic TlFeSe2 single crystal,which is an antiferromagnetic insulator with quasi-one-dimensional crystal structure at ambient pressure.It is found that TlFeSe2 undergoes a pressure-induced structural transformation from the monoclinic phase to an orthorhombic structure above Pc ≈ 13 GPa,accompanied with a large volume collapse of △V/Vo =8.3%.In the low-pressure monoclinic phase,the insulating state is easily metallized at pressures above 2 GPa;while possible superconductivity with Tconset ~ 2 K is found to emerge above 30 GPa in the high-pressure phase.Such a great tunability of TlFeSe2 under pressure indicates that the teary AFeSe2 system (A =Tl,K,Cs,Rb) should be taken as an important platform for explorations of interesting phenomena such as insulator-metal transition,dimensionality crossover,and superconductivity.
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