Direct bulk-sensitive probe of 5f symmetry in URu2Si2
The second-order phase transition into a hidden order phase in URu2Si2 goes along with an order parameter that is still a mystery, despite 30 years of research. However, it is understood that the symmetry of the order parameter must be related to the symmetry of the low-lying local electronic ff<...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
November 21, 2016
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| In: |
Proceedings of the National Academy of Sciences of the United States of America
Year: 2016, Volume: 113, Issue: 49, Pages: 13989-13994 |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.1612791113 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1073/pnas.1612791113 Verlag, lizenzpflichtig, Volltext: https://www.pnas.org/content/113/49/13989 
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| Author Notes: | Martin Sundermann, Maurits W. Haverkort, Stefano Agrestini, Ali Al-Zein, Marco Moretti Sala, Yingkai Huang, Mark Golden, Anne de Visser, Peter Thalmeier, Liu Hao Tjeng, and Andrea Severing |
| Summary: | The second-order phase transition into a hidden order phase in URu2Si2 goes along with an order parameter that is still a mystery, despite 30 years of research. However, it is understood that the symmetry of the order parameter must be related to the symmetry of the low-lying local electronic ff<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>f</mml:mi></mml:math>-states. Here, we present results of a spectroscopic technique, namely core-level nonresonant inelastic X-ray scattering (NIXS). This method allows for the measurement of local high-multipole excitations and is bulk-sensitive. The observed anisotropy of the scattering function unambiguously shows that the 5ff<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>f</mml:mi></mml:math> ground-state wave function is composed mainly of the Γ1Γ1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Γ</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math> with majority JzJz<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>J</mml:mi><mml:mi>z</mml:mi></mml:msub></mml:math> = |4⟩|4⟩<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo fence="true" stretchy="false">|</mml:mo><mml:mn>4</mml:mn><mml:mo stretchy="false">⟩</mml:mo></mml:mrow></mml:math> + |−4⟩|−4⟩<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo fence="true" stretchy="false">|</mml:mo><mml:mrow><mml:mo>−</mml:mo><mml:mn>4</mml:mn></mml:mrow><mml:mo stretchy="false">⟩</mml:mo></mml:mrow></mml:math> and/or Γ2Γ2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Γ</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> singlet states. The incomplete dichroism indicates the possibility that quantum states of other irreducible representation are mixed into the ground state. |
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| Item Description: | Gesehen am 26.05.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.1612791113 |