凝聚态物理
材料科学
反铁磁性
金属-绝缘体过渡
相变
量子相变
库仑
格子(音乐)
氮化铬
金属
氮化物
电子
纳米技术
物理
冶金
量子力学
图层(电子)
声学
作者
Bidesh Biswas,S. Rudra,Rahul Rawat,Nidhi Pandey,Shashidhara Acharya,A. S. Joseph,Ashalatha Indiradevi Kamalasanan Pillai,Manisha Bansal,Muireann de h-Óra,Debendra Prasad Panda,Arka Bikash Dey,Florian Bertram,Chandrabhas Narayana,Judith L. MacManus‐Driscoll,Tuhin Maity,Magnus Garbrecht,Bivas Saha
标识
DOI:10.1103/physrevlett.131.126302
摘要
Traditionally, the Coulomb repulsion or Peierls instability causes the metal-insulator phase transitions in strongly correlated quantum materials. In comparison, magnetic stress is predicted to drive the metal-insulator transition in materials exhibiting strong spin-lattice coupling. However, this mechanism lacks experimental validation and an in-depth understanding. Here we demonstrate the existence of the magnetic stress-driven metal-insulator transition in an archetypal material, chromium nitride. Structural, magnetic, electronic transport characterization, and first-principles modeling analysis show that the phase transition temperature in CrN is directly proportional to the strain-controlled anisotropic magnetic stress. The compressive strain increases the magnetic stress, leading to the much-coveted room-temperature transition. In contrast, tensile strain and the inclusion of nonmagnetic cations weaken the magnetic stress and reduce the transition temperature. This discovery of a new physical origin of metal-insulator phase transition that unifies spin, charge, and lattice degrees of freedom in correlated materials marks a new paradigm and could lead to novel device functionalities.
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