Universität zu Köln

Sundermann, Martin, Haverkort, Maurits W. ORCID: 0000-0002-7216-3146, Agrestini, Stefano ORCID: 0000-0002-3625-880X, Al-Zein, Ali, Sala, Marco Moretti ORCID: 0000-0002-9744-9976, Huang, Yingkai, Golden, Mark, de Visser, Anne, Thalmeier, Peter, Tjeng, Liu Hao ORCID: 0000-0002-0595-9312 and Severing, Andrea ORCID: 0000-0002-9547-2742 (2016). Direct bulk-sensitive probe of 5f symmetry in URu2Si2. Proc. Natl. Acad. Sci. U. S. A., 113 (49). S. 13989 - 13995. WASHINGTON: NATL ACAD SCIENCES. ISSN 0027-8424

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Abstract

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 f-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 5f ground-state wave function is composed mainly of the Gamma(1) with majority J(z) = |4 > + |4 > and/or Gamma(2) singlet states. The incomplete dichroism indicates the possibility that quantum states of other irreducible representation are mixed into the ground state.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sundermann, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Haverkort, Maurits W. UNSPECIFIED orcid.org/0000-0002-7216-3146 UNSPECIFIED Agrestini, Stefano UNSPECIFIED orcid.org/0000-0002-3625-880X UNSPECIFIED Al-Zein, Ali UNSPECIFIED UNSPECIFIED UNSPECIFIED Sala, Marco Moretti UNSPECIFIED orcid.org/0000-0002-9744-9976 UNSPECIFIED Huang, Yingkai UNSPECIFIED UNSPECIFIED UNSPECIFIED Golden, Mark UNSPECIFIED UNSPECIFIED UNSPECIFIED de Visser, Anne UNSPECIFIED UNSPECIFIED UNSPECIFIED Thalmeier, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, Liu Hao UNSPECIFIED orcid.org/0000-0002-0595-9312 UNSPECIFIED Severing, Andrea UNSPECIFIED orcid.org/0000-0002-9547-2742 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252735
DOI:	10.1073/pnas.1612791113
Journal or Publication Title:	Proc. Natl. Acad. Sci. U. S. A.
Volume:	113
Number:	49
Page Range:	S. 13989 - 13995
Date:	2016
Publisher:	NATL ACAD SCIENCES
Place of Publication:	WASHINGTON
ISSN:	0027-8424
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIDDEN-ORDER TRANSITION; MAGNETIC EXCITATIONS; FERMI-SURFACE; LATTICE; SYSTEM; BREAKING; PHASE; SUPERCONDUCTIVITY; ENTROPY Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25273