Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn5.
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| Title: | Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn5. |
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| Authors: | Maksimovic, Nikola, Eilbott, Daniel H., Cookmeyer, Tessa, Wan, Fanghui, Rusz, Jan, Nagarajan, Vikram, Haley, Shannon C., Maniv, Eran, Gong, Amanda, Faubel, Stefano, Hayes, Ian M., Bangura, Ali, Singleton, John, Palmstrom, Johanna C., Winter, Laurel, McDonald, Ross, Jang, Sooyoung, Ai, Ping, Lin, Yi, Ciocys, Samuel |
| Source: | Science (pre-March 2025). 1/7/2022, Vol. 375 Issue 6576, p76-81. 6p. 4 Color Photographs. |
| Subjects: | Delocalization energy, Physics, Superconductivity, Superconductors, Electrons |
| Abstract: | The study of quantum phase transitions that are not clearly associated with broken symmetry is a major effort in condensed matter physics, particularly in regard to the problem of high-temperature superconductivity, for which such transitions are thought to underlie the mechanism of superconductivity itself. Here we argue that the putative quantum critical point in the prototypical unconventional superconductor CeCoIn5 is characterized by the delocalization of electrons in a transition that connects two Fermi surfaces of different volumes, with no apparent broken symmetry. Drawing on established theory of f-electron metals, we discuss an interpretation for such a transition that involves the fractionalization of spin and charge, a model that effectively describes the anomalous transport behavior we measured for the Hall effect. [ABSTRACT FROM AUTHOR] |
| Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | The study of quantum phase transitions that are not clearly associated with broken symmetry is a major effort in condensed matter physics, particularly in regard to the problem of high-temperature superconductivity, for which such transitions are thought to underlie the mechanism of superconductivity itself. Here we argue that the putative quantum critical point in the prototypical unconventional superconductor CeCoIn5 is characterized by the delocalization of electrons in a transition that connects two Fermi surfaces of different volumes, with no apparent broken symmetry. Drawing on established theory of f-electron metals, we discuss an interpretation for such a transition that involves the fractionalization of spin and charge, a model that effectively describes the anomalous transport behavior we measured for the Hall effect. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.aaz4566 |
