期刊
NATURE PHYSICS
卷 7, 期 12, 页码 978-982出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2089
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资金
- Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organisation for Scientific Research (NWO)
- EPSRC [EP/H033939/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H033939/1] Funding Source: researchfish
The origin of colossal magnetoresistance (CMR) in manganese oxides is among the most challenging problems in condensed-matter physics today. The true nature of the low-temperature electronic phase of these materials is heavily debated. By combining photoemission and tunnelling data, we show that in the archetypal bilayer system La2-2xSr1+2xMn2O7, polaronic degrees of freedom win out across the CMR region of the phase diagram. This means that the generic ground state of bilayer manganites supports a vanishing coherent quasi-particle spectral weight at the Fermi level throughout k-space. The incoherence of the charge carriers, resulting from strong electron-lattice interactions and the accompanying orbital physics, offers a unifying explanation for the anomalous charge-carrier dynamics seen in transport, optics and electron spectroscopies. The stacking number N is the key factor for true metallic behaviour, as an intergrowth-driven breakdown of the polaronic domination to give a metal possessing a traditional Fermi surface is seen in this system.
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