000088276 001__ 88276
000088276 005__ 20200716101503.0
000088276 0247_ $$2doi$$a10.1039/c8dt05044a
000088276 0248_ $$2sideral$$a111507
000088276 037__ $$aART-2019-111507
000088276 041__ $$aeng
000088276 100__ $$aBartolomé, E.
000088276 245__ $$aSlow relaxation in a {Tb 2 Ba(a-fur) 8 } :N polymer with Ln = Tb(iii) non-Kramers ions
000088276 260__ $$c2019
000088276 5060_ $$aAccess copy available to the general public$$fUnrestricted
000088276 5203_ $$aWe report the synthesis, crystal structure and magnetic properties of a new heteronuclear polymeric complex based on non-Kramers Tb ions and carboxylic a-fur = C 4 H 3 OCOO ligands: {[Tb 2 Ba(a-fur) 8 (H 2 O) 4 ]·2H 2 O} n . The a-furoate ligands consolidate 1D zig-zag chains running along the c-axis, formed by Tb 2 dimers separated by Ba ions. Ab initio calculations, in combination with the fit of experimental data, predict that the single-ion magnetic ground state is highly anisotropic and consists of a quasi-doublet with a ¿ Tb /k B = 3.22 K gap, well separated from the next excited state, while the gap for the Tb 2 dimer is ¿ 2Tb /k B = 2.58 K. Static magnetization and heat capacity measurements show that, magnetically, the system can be modeled as dimers of non-Kramers Tb ions, coupled by an antiferromagnetic intradimer interaction J'*/k B = -1.6 K. Dipolar interactions couple the Tb ions in the dimer with their first neighbour ions along the chain, with J''*/k B = -0.15 K, and with the surrounding ions out of the chain, with maximum J'''*/k B = -0.03 K. Ac susceptibility measurements in H = 0 performed down to 50 mK temperatures have enabled us to observe slow relaxation of magnetization, with an Orbach-like activation energy of U/k B = 1.1 K. It is assigned to the sluggish response of the 3D spin system due to a short-range ordering, possibly enhanced by the presence of disorder caused by defects in the polymeric chains. Under the application of a magnetic field, the system slowly relaxes by two distinct direct processes, strongly affected by a phonon bottleneck effect. We discuss the different relaxational phenomenology of the new complex in comparison with that of the isostructural {[Dy 2 Ba(a-fur) 8 (H 2 O) 4 ]·2H 2 O} n , differing only in the Kramers nature of the ions, and the mononuclear {Ln(a-fur) 3 (H 2 O) 3 } n (Ln = Tb, Dy) complexes, previously reported.
000088276 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53921-R$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-2-P$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-83468-R
000088276 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000088276 590__ $$a4.174$$b2019
000088276 591__ $$aCHEMISTRY, INORGANIC & NUCLEAR$$b5 / 45 = 0.111$$c2019$$dQ1$$eT1
000088276 592__ $$a1.048$$b2019
000088276 593__ $$aInorganic Chemistry$$c2019$$dQ1
000088276 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000088276 700__ $$0(orcid)0000-0002-5999-341X$$aArauzo, A.$$uUniversidad de Zaragoza
000088276 700__ $$0(orcid)0000-0002-9208-0807$$aLuzón, J.
000088276 700__ $$aMelnic, S.
000088276 700__ $$aShova, S.
000088276 700__ $$aProdius, D.
000088276 700__ $$0(orcid)0000-0002-0047-1772$$aBartolomé, J.$$uUniversidad de Zaragoza
000088276 700__ $$aAmann, A.
000088276 700__ $$aNallaiyan, M.
000088276 700__ $$aSpagna, S.
000088276 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000088276 773__ $$g48, 15 (2019), 5022-5034$$pDalton Trans.$$tDalton Transactions$$x1477-9226
000088276 8564_ $$s1288515$$uhttps://zaguan.unizar.es/record/88276/files/texto_completo.pdf$$yPostprint
000088276 8564_ $$s111104$$uhttps://zaguan.unizar.es/record/88276/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000088276 909CO $$ooai:zaguan.unizar.es:88276$$particulos$$pdriver
000088276 951__ $$a2020-07-16-09:14:18
000088276 980__ $$aARTICLE