The emergence of scalar Higgs-type amplitude modes in systems where symmetry is spontaneously broken has been a highly successful, paradigmatic description of phase transitions, with implications ranging from high-energy particle physics to low-energy condensed matter systems. Here, we uncover two successive high temperature phase transitions in the pyrochlore magnet Nd2Ru2O7at
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Abstract T N = 147 K andT * = 97 K, that lead to giant phonon instabilities and culminate in the emergence of a highly coherent excitation. This coherent excitation, distinct from other phonons and from conventional magnetic modes, stabilizes at a low energy of 3 meV. We assign it to a collective Higgs-type amplitude mode, that involves bond energy modulations of the Ru4tetrahedra. Its striking two-fold symmetry, incompatible with the underlying crystal structure, highlights the possibility of multiple entangled broken symmetries. -
Jeong, Juyoung ; Yang, Ilkyu ; Yang, Jinho ; Ayala-Valenzuela, Oscar E. ; Wulferding, Dirk ; Zhou, J.-S. ; Goodenough, John B. ; de Lozanne, Alex ; Mitchell, J. F. ; Leon, Neliza ; et al ( , Physical Review B)