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journal article·2024-08-13Open access

Self-Stacked 1T-1H Layers in 6R-NbSeTe and the Emergence of Charge and Magnetic Correlations Due to Ligand Disorder

Sanjoy K. Mahatha, Jan Phillips, Javier Corral-Sertal, David Subires, Artem Korshunov, Arunava Kar, Jens Buck, Florian Diekmann, Gaston Garbarino, Yurii P. Ivanov, Andrey Chuvilin, Debashis Mondal, Ivana Vobornik, Alexei Bosak, Kai Rossnagel, Victor Pardo, Adolfo O. Fumega, Santiago Blanco-Canosa

ACS Nano· Volume 18· Issue 32
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Source abstract

Abstract

The emergence of correlated phenomena arising from the combination of 1T and 1H van der Waals layers is the focus of intense research. Here, we synthesize a self-stacked 6R phase in NbSeTe, showing perfect alternating 1T and 1H layers that grow coherently along the c-direction, as revealed by scanning transmission electron microscopy. Angle-resolved photoemission spectroscopy shows a mixed contribution of the trigonal and octahedral Nb bands to the Fermi level. Diffuse scattering reveals temperature-independent short-range charge fluctuations with propagation vector q CO = (0.25 0), derived from the condensation of a longitudinal mode in the 1T layer, while the long-range charge density wave is quenched by ligand disorder. Magnetization measurements suggest the presence of an inhomogeneous, short-range magnetic order, further supported by the absence of a clear phase transition in the specific heat. These experimental analyses in combination with ab initio calculations indicate that the ground state of 6R-NbSeTe is described by a statistical distribution of short-range charge-modulated and spin-correlated regions driven by ligand disorder. Our results demonstrate how natural 1T-1H self-stacked bulk heterostructures can be used to engineer emergent phases of matter.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · Iron-based superconductors research · Organic and Molecular Conductors Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India

Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany

Departamento de Física Aplicada, Universidade de Santiago de Compostela, Campus Sur s/n, E-15782 Santiago de Compostela, Spain

Instituto de Materiais iMATUS, Universidade de Santiago de Compostela, Campus Sur s/n, E-15782 Santiago de Compostela, Spain

CiQUS, Centro Singular de Investigacion en Quimica Biolóxica e Materiais Moleculares, Departamento de Quimica-Fisica, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain

Donostia International Physics Center (DIPC), E-20018 San Sebastián, Spain

University of the Basque Country (UPV/EHU), Basque Country, Bilbao 48080 Spain

European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France

Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex 9, France

Electron Spectroscopy and Nanoscopy, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy

CIC Nanogune, E-20018 San Sebastián, Spain

IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain

Consiglio Nazionale delle Ricerche (CNR)- Istituto Officina dei Materiali (IOM), Laboratorio TASC in Area Science, 34149 Trieste, Italy

Sovarani Memorial College, Jagatballavpur, Howrah 711408, India

Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

Department of Applied Physics, Aalto University, 02150 Espoo, Finland

Funding

European Commission · Ministerio de Ciencia e Innovaci?n · Ministerio de Econom?a y Competitividad · Ikerbasque, Basque Foundation for Science · Deutsche Forschungsgemeinschaft · Research Council of Finland · Ministerio de Educaci?n, Cultura y Deporte · Hezkuntza, Hizkuntza Politika Eta Kultura Saila, Eusko Jaurlaritza

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