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  Thermodynamics of phase formation in the quantum critical metal Sr3Ru2O7

Rost, A. W., Grigera, S. A., Bruin, J. A. N., Perry, R. S., Tian, D., Raghu, S., et al. (2011). Thermodynamics of phase formation in the quantum critical metal Sr3Ru2O7. Proceedings of the National Academy of Sciences of the United States of America, 108(40), 16549-16553. doi:10.1073/pnas.1112775108.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F2AF-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F2B1-5
Genre: Journal Article

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 Creators:
Rost, A. W.1, Author
Grigera, S. A.1, Author
Bruin, J. A. N., Author
Perry, R. S.1, Author
Tian, D.1, Author
Raghu, S.1, Author
Kivelson, Steven Allan1, Author
Mackenzie, A. P.2, Author              
Affiliations:
1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: The behavior of matter near zero temperature continuous phase transitions, or "quantum critical points" is a central topic of study in condensed matter physics. In fermionic systems, fundamental questions remain unanswered: the nature of the quantum critical regime is unclear because of the apparent breakdown of the concept of the quasiparticle, a cornerstone of existing theories of strongly interacting metals. Even less is known experimentally about the formation of ordered phases from such a quantum critical "soup." Here, we report a study of the specific heat across the phase diagram of the model system Sr3Ru2O7, which features an anomalous phase whose transport properties are consistent with those of an electronic nematic. We show that this phase, which exists at low temperatures in a narrow range of magnetic fields, forms directly from a quantum critical state, and contains more entropy than mean-field calculations predict. Our results suggest that this extra entropy is due to remnant degrees of freedom from the highly entropic state above T-c. The associated quantum critical point, which is "concealed" by the nematic phase, separates two Fermi liquids, neither of which has an identifiable spontaneously broken symmetry, but which likely differ in the topology of their Fermi surfaces.

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 Dates: 2011-10-04
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000295536000020
DOI: 10.1073/pnas.1112775108
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: National Academy of Sciences
Pages: - Volume / Issue: 108 (40) Sequence Number: - Start / End Page: 16549 - 16553 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230