Singlet magnetism in intermetallic UGa2 unveiled by inelastic x-ray scattering

被引：7

作者：

Marino, Andrea ^{[1
]}

Sundermann, Martin ^{[1
,2
]}

Christovam, Denise S. ^{[1
]}

Amorese, Andrea ^{[1
,3
]}

Chang, Chun-Fu ^{[1
]}

Dolmantas, Paulius ^{[1
]}

Said, Ayman H. ^{[4
]}

Gretarsson, Hlynur ^{[2
]}

Keimer, Bernhard ^{[5
]}

Haverkort, Maurits W. ^{[6
]}

Andreev, Alexander V. ^{[7
]}

Havela, Ladislav ^{[8
]}

Thalmeier, Peter ^{[1
]}

Tjeng, Liu Hao ^{[1
]}

Severing, Andrea ^{[1
,3
]}

机构：

[1] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[2] Deutsch Elekt Synchrotron DESY, PETRA 3, Notkestr 85, D-22607 Hamburg, Germany

[3] Univ Cologne, Inst Phys 2, Zulpicher Str 77, D-50937 Cologne, Germany

[4] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Lemont, IL 60439 USA

[5] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

[6] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 19, D-69120 Heidelberg, Germany

[7] Acad Sci Czech Republ, Inst Phys, Na Slovance 1999-2, Prague 18221 8, Czech Republic

[8] Charles Univ Prague, Dept Condensed Matter Phys, Fac Math & Phys, Ke Karlovu 5, Prague 12116 2, Czech Republic

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 04期

关键词：

GROUND-STATE; HIDDEN ORDER; SUPERCONDUCTING PHASES; ELECTRONIC-STRUCTURE; NEUTRON-SCATTERING; CRYSTAL-FIELD; EXCITATIONS; SPECTRA; SYSTEMS;

D O I：

10.1103/PhysRevB.108.045142

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using high resolution tender x-ray resonant inelastic scattering and hard x-ray nonresonant inelastic scattering beyond the dipole limit we were able to detect electronic excitations in intermetallic UGa2 that are highly atomic in nature. Analysis of the spectral lineshape reveals that the local 5f(2) configuration characterizes the correlated nature of this ferromagnet. The orientation and directional dependence of the spectra indicate that the ground state is made of the Gamma(1) singlet and/or Gamma(6) doublet symmetry. With the ordered moment in the ab plane, we infer that the magnetism originates from the higher lying Gamma(6) doublet being mixed with the Gamma(1) singlet due to intersite exchange, qualifying UGa2 to be a true quantum magnet. The ability to observe atomic excitations is crucial to resolve the ongoing debate about the degree of localization versus itineracy in U intermetallics.

引用

页数：9

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