2026-06-27T10:19:53Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/80922023-08-26T14:41:26Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Castellano, C.
author
Scavini, M.
author
Berti, G.
author
Rubio Marcos, F.
author
Lamura, G.
author
Sanna, S
author
Salas Colera, E.
author
Muñoz Noval, Álvaro
author
Cimberle, M. R.
author
Demartin, F.
2023-06-17T09:04:13Z
2023-06-17T09:04:13Z
2021-06-05
0925-8388
10.1016/j.jallcom.2021.158958
https://hdl.handle.net/20.500.14352/8092
http://dx.doi.org/10.1016/j.jallcom.2021.158958
https://www.sciencedirect.com/
We present an extended X-ray absorption fine structure study at the Mo K-edge of A_2(Mo_(1-y)Mn_y)_2O_7 (A = Gd, Ho; y = 0.05 and 0.10) pyrochlores, as a function of temperature and composition, coupled to diffractometric and magnetic characterizations. Extending the study reported in our previous paper on the pristine A_2Mo_2O_7 compounds to these Mo/Mn partially substituted samples, where we hypothesize a competition between double-exchange and superexchange couplings, we aim to check which structure parameters are related to the nature of the nearest-neighbor magnetic interactions, looking for the presence and evolution of order and structure anomalies. Two Ho samples A_2(Mo_(1-y)Mn_y)_2O_7 (y = 0.05 and 0.10) keep the spin-glass nature of the parent compositions with a strong distortion of the MoO octahedron and of the Mo - Ho and Mo - Mo second shell. On the other hand, two Gd_2(Mo_(1-y)Mn_y)_2O_7 samples, ferromagnetic at low temperature in the undoped case, show the appearance on a local scale of a spin-glass transition mirrored by a quite high structure disorder and by a distortion coherent with a lattice frustration after Mn-doping. Therefore, the Gd and Ho Mn-doped samples display a similar frustrated behavior, differently from the corresponding undoped ones.
eng
Atribución-NoComercial-SinDerivadas 3.0 España
Local disorder and structure relation induced by magnetic exchange interactions in A_2(Mo_(1-y)Mn_y)_2O_7 pyrochlores
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MuñozNovalA 03 Postprint+EMB-05-jun-2023+CC(nc-nd) A.pdf
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MuñozNovalA 03 Postprint+EMB-05-jun-2023+CC(nc-nd) B.pdf
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MuñozNovalA 03 Postprint+EMB-05-jun-2023+CC(nc-nd) A.pdf.txt
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