Quantum phase transition from triangular to stripe charge order in NbSe <sub>2</sub>
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- Anjan Soumyanarayanan
- Department of Physics, Harvard University, Cambridge, MA 02138;
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- Michael M. Yee
- Department of Physics, Harvard University, Cambridge, MA 02138;
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- Yang He
- Department of Physics, Harvard University, Cambridge, MA 02138;
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- Jasper van Wezel
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439;
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- Dirk J. Rahn
- Institute of Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany; and
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- Kai Rossnagel
- Institute of Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany; and
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- E. W. Hudson
- Department of Physics, Pennsylvania State University, State College, PA 16802
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- Michael R. Norman
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439;
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- Jennifer E. Hoffman
- Department of Physics, Harvard University, Cambridge, MA 02138;
書誌事項
- 公開日
- 2013-01-14
- DOI
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- 10.1073/pnas.1211387110
- 公開者
- Proceedings of the National Academy of Sciences
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説明
<jats:p> The competition between proximate electronic phases produces a complex phenomenology in strongly correlated systems. In particular, fluctuations associated with periodic charge or spin modulations, known as density waves, may lead to exotic superconductivity in several correlated materials. However, density waves have been difficult to isolate in the presence of chemical disorder, and the suspected causal link between competing density wave orders and high-temperature superconductivity is not understood. Here we used scanning tunneling microscopy to image a previously unknown unidirectional (stripe) charge-density wave (CDW) smoothly interfacing with the familiar tridirectional (triangular) CDW on the surface of the stoichiometric superconductor NbSe <jats:sub>2</jats:sub> . Our low-temperature measurements rule out thermal fluctuations and point to local strain as the tuning parameter for this quantum phase transition. We use this quantum interface to resolve two longstanding debates about the anomalous spectroscopic gap and the role of Fermi surface nesting in the CDW phase of NbSe <jats:sub>2</jats:sub> . Our results highlight the importance of local strain in governing phase transitions and competing phenomena, and suggest a promising direction of inquiry for resolving similarly longstanding debates in cuprate superconductors and other strongly correlated materials. </jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 110 (5), 1623-1627, 2013-01-14
Proceedings of the National Academy of Sciences
