000225065 001__ 225065
000225065 005__ 20190317000627.0
000225065 0247_ $$2doi$$a10.1103/PhysRevB.94.174406
000225065 022__ $$a2469-9950
000225065 02470 $$2ISI$$a000386768400003
000225065 037__ $$aARTICLE
000225065 245__ $$aNeutron Larmor diffraction investigation of the rare-earth pyrochlores R2Ti2O7 (R = Tb, Dy, Ho)
000225065 260__ $$bAmer Physical Soc$$c2016$$aCollege Pk
000225065 269__ $$a2016
000225065 300__ $$a8
000225065 336__ $$aJournal Articles
000225065 520__ $$aIn this work, we present a neutron Larmor diffraction study of the rare-earth pyrochlores R2Ti2O7 with R = Tb, Dy, Ho. We measured the temperature dependence of the lattice parameter with precision 10(-5), between 0.5 and 300 K in each of the three compounds. The lattice parameter of the spin ices Dy2Ti2O7 and Ho2Ti2O7 enters into the derivation of the charge of the emergent magnetic monopole excitations suggested to exist in these materials. We found that throughout the range of applicability of the theory of emergent monopoles in the spin ices there will be no renormalization of the monopole charge due to lattice contraction. In Tb2Ti2O7, strong magnetoelastic interactions have been reported. We found no sign of the previously reported negative thermal expansion, but did observe anomalies in the thermal expansion that can be correlated with previously observed interactions between phonon and crystal-field excitations. Other features in the thermal expansion of all three compounds can be related to previously observed anomalies of the elastic constants, and explained by the phonon band structure of the rare-earth titanates. The temperature dependence of the lattice strain in all three compounds can be correlated with the thermal population of excited crystal-field levels.
000225065 700__ $$uPaul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland$$aRuminy, M.
000225065 700__ $$0247418$$g239894$$uPaul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland$$aGroitl, F.
000225065 700__ $$uMax Planck Inst Festkorperphys, D-70569 Stuttgart, Germany$$aKeller, T.
000225065 700__ $$aFennell, T.$$uPaul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland
000225065 773__ $$j94$$tPhysical Review B$$k17$$q174406
000225065 8564_ $$uhttp://lqm.epfl.ch$$zURL
000225065 8564_ $$uhttps://infoscience.epfl.ch/record/225065/files/PhysRevB.94.174406.pdf$$zPublisher's version$$s528332$$yPublisher's version
000225065 909C0 $$xU11706$$0252200$$pLQM
000225065 909CO $$ooai:infoscience.tind.io:225065$$qGLOBAL_SET$$pSB$$particle
000225065 917Z8 $$x176429
000225065 937__ $$aEPFL-ARTICLE-225065
000225065 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000225065 980__ $$aARTICLE