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  Multidimensional entropy landscape of quantum criticality

Grube, K., Zaum, S., Stockert, O., Si, Q., & Loehneysen, H. v. (2017). Multidimensional entropy landscape of quantum criticality. Nature Physics, 13(8), 742-745. doi:10.1038/NPHYS4113.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D03A-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-0908-D
Genre: Journal Article

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 Creators:
Grube, K.1, Author
Zaum, S.1, Author
Stockert, O.2, Author              
Si, Q.1, Author
Loehneysen, H. v.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: The third law of thermodynamics states that the entropy of any system in equilibrium has to vanish at absolute zero temperature. At nonzero temperatures, on the other hand, matter is expected to accumulate entropy near a quantum critical point, where it undergoes a continuous transition from one ground state to another(1,2). Here, we determine, based on general thermodynamic principles, the spatial-dimensional profile of the entropy S near a quantum critical point and its steepest descent in the corresponding multidimensional stress space. We demonstrate this approach for the canonical quantum critical compound CeCu6-xAux near its onset of antiferromagnetic order(2). We are able to link the directional stress dependence of S to the previously determined geometry of quantum critical fluctuations(3). Our demonstration of the multidimensional entropy landscape provides the foundation to understand how quantum criticality nucleates novel phases such as high-temperature superconductivity.

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Language(s): eng - English
 Dates: 2017-05-082017-05-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000406778100010
DOI: 10.1038/NPHYS4113
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 13 (8) Sequence Number: - Start / End Page: 742 - 745 Identifier: ISSN: 1745-2473
CoNE: /journals/resource/1000000000025850