Coexistence of charge-density wave and ferromagnetism in Ni2MnGa

Article

关键词: MEMORY COMPOUND NI2MNGA;    PREMARTENSITIC TRANSFORMATION;    ELECTRONIC-STRUCTURE;    PEIERLS TRANSITION;    PHASE-TRANSITIONS;    CRYSTAL-STRUCTURE;    LOW-TEMPERATURE;    MAGNETIC ORDER;    ALLOY NI2MNGA;    SURFACE;   

DOI  :  10.1103/PhysRevB.85.085123

来源: SCIE

【 摘 要 】

We demonstrate the existence of a charge-density-wave (CDW) associated with an incommensurate periodic lattice distortion on Ni2MnGa surface in the ferromagnetic state. Our temperature-dependent photoemission spectra provide compelling evidence of a pseudogap at the Fermi level for T-CDW <= 270 K that appears at the onset of the premartensite phase and persists in the martensite phase. While the width of the pseudogap is about 25 meV, a spectral weight transfer is observed over a much wider energy range that is associated with the CDW.

【 授权许可】

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