Quasimolecular J_{tet}=3/2 Moments in the Cluster Mott Insulator GaTa_{4}Se_{8}.

Magnaterra, M; Attig, J; Peterlini, L; Hermanns, M; Upton, M H; Kim, Jungho; Prodan, L; Tsurkan, V; Kézsmárki, I; van Loosdrecht, P H M; Grüninger, M

Magnaterra, M; Attig, J; Peterlini, L; Hermanns, M; Upton, M H; Kim, Jungho; Prodan, L; Tsurkan, V; Kézsmárki, I; van Loosdrecht, P H M; Grüninger, M.

Afiliación

Magnaterra M; Institute of Physics II, <a href="https://ror.org/00rcxh774">University of Cologne</a>, 50937 Cologne, Germany.
Attig J; Institute for Theoretical Physics, <a href="https://ror.org/00rcxh774">University of Cologne</a>, 50937 Cologne, Germany.
Peterlini L; Institute for Theoretical Physics, <a href="https://ror.org/00rcxh774">University of Cologne</a>, 50937 Cologne, Germany.
Hermanns M; Department of Physics, <a href="https://ror.org/05f0yaq80">Stockholm University</a>, AlbaNova University Center, SE-106 91 Stockholm, Sweden.
Upton MH; Advanced Photon Source, <a href="https://ror.org/05gvnxz63">Argonne National Laboratory</a>, Argonne, Illinois 60439, USA.
Kim J; Advanced Photon Source, <a href="https://ror.org/05gvnxz63">Argonne National Laboratory</a>, Argonne, Illinois 60439, USA.
Prodan L; Experimental Physics V, Center for Electronic Correlations and Magnetism, <a href="https://ror.org/03p14d497">University of Augsburg</a>, Germany.
Tsurkan V; Experimental Physics V, Center for Electronic Correlations and Magnetism, <a href="https://ror.org/03p14d497">University of Augsburg</a>, Germany.
Kézsmárki I; <a href="https://ror.org/03eaxvz05">Institute of Applied Physics</a>, <a href="https://ror.org/0475kvb92">Moldova State University</a>, MD 2028, Chisinau, Republic of Moldova.
van Loosdrecht PHM; Experimental Physics V, Center for Electronic Correlations and Magnetism, <a href="https://ror.org/03p14d497">University of Augsburg</a>, Germany.
Grüninger M; Institute of Physics II, <a href="https://ror.org/00rcxh774">University of Cologne</a>, 50937 Cologne, Germany.

Phys Rev Lett ; 133(4): 046501, 2024 Jul 26.

Article en En | MEDLINE | ID: mdl-39121433

ABSTRACT

ABSTRACT

Quasimolecular orbitals in cluster Mott insulators provide a route to tailor exchange interactions, which may yield novel quantum phases of matter. We demonstrate the cluster Mott character of the lacunar spinel GaTa_{4}Se_{8} using resonant inelastic x-ray scattering (RIXS) at the Ta L_{3} edge. Electrons are fully delocalized over Ta_{4} tetrahedra, forming quasimolecular J_{tet}=3/2 moments. The modulation of the RIXS intensity as function of the transferred momentum q allows us to determine the cluster wave function, which depends on competing intracluster hopping terms that mix states with different character. This mixed wave function is decisive for the macroscopic properties since it affects intercluster hopping and exchange interactions and furthermore renormalizes the effective spin-orbit coupling constant. The versatile wave function, tunable via intracluster hopping, opens a new perspective on the large family of lacunar spinels and cluster Mott insulators in general.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2024 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos

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