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oai:docta.ucm.es:20.500.14352/726252026-04-22T12:14:04Zcom_20.500.14352_14col_20.500.14352_15

Coexistence of two spin frustration pathways in the quantum spin liquid Ca_10Cr_7O_28 Alshalawi, Dhoha Alonso Gómez, José Miguel Landa Cánovas, Ángel Presa Muñoz De Toro, Patricia Marcela De La 538.9 Chromium Crystal States Física de materiales Física del estado sólido 2211 Física del Estado Sólido CRUE-CSIC (Acuerdos Transformativos 2022) ©2022 American Chemical Society This research has been funded by Ministerio de Ciencia, Innovación y Universidades (grant number RTI2018-095856-B-C21), and Agregaduría Cultural de Arabia Saudí Spain (project code 4157592). Kagome antiferromagnetic lattices are of high interest because the geometric frustration is expected to give rise to highly degenerated ground states that may host exotic properties such as quantum spin liquid (QSL). Ca_10Cr_7O_28 has been reported to display all the features expected for a QSL. At present, most of the literature reports on samples synthesized with starting materials ratio CaO/Cr_2O_3 3:1, which leads to a material with small amounts of CaCrO_4 and CaO as secondary phases; this impurity excess affects not only the magnetic properties but also the structural ones. In this work, samples with starting material ratios CaO/Cr_2O_3 3:1, 2.9:1, 2.85:1, and 2.8:1 have been synthesized and studied by X-ray diffraction with Rietveld refinements, selected area electron diffraction measurements, high-resolution transmission electron microscopy (HRTEM), low-temperature magnetometry, and magnetic calorimetry. This result shows that a highly pure Ca_10Cr_7O_28 phase is obtained for a CaO/Cr_2O_3 ratio of 2.85:1 instead of the 3:1 usually reported; the incorrect stoichiometric ratio leads to a larger distortion of the corner-sharing triangular arrangement of magnetic ions Cr+5 with S = 1/2 in the Kagome lattice. In addition, our study reveals that there exists another frustration pathway which is an asymmetric zigzag spin ladder along the directions [211], [12-1], and [1- 1-1], in which the Cr-Cr distances are shorter than in the Kagome layers. Ministerio de Ciencia e Innovación (España) Agregaduría Cultural de Arabia Saudí (España) Depto. de Física de Materiales Fac. de Ciencias Físicas Instituto de Magnetismo Aplicado (IMA) TRUE pub 2023-06-22T12:28:43Z 2023-06-22T12:28:43Z 2022-10-03 journal article https://hdl.handle.net/20.500.14352/72625 0020-1669 10.1021/acs.inorgchem.2c01831 eng info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095856-B-C21/ES/DESARROLLO DE MATERIALES MAGNETICOS Y SENSORES PARA APLICACIONES BIOMEDICAS/ Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ open access application/pdf ACS Publications