226 citations · 293 across the 4 of their papers we have counts for
10 papers
Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet
O. Cepas, C. M. Fong, P. W. Leung +1
We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For the system is in a moment-free…
How to detect weak emergent broken-symmetries of the Kagome antiferromagnet from Raman spectroscopy
O. Cepas, J. O. Haerter, C. Lhuillier
We show that the magnetic Raman response of a spin-liquid is independent of the polarizations of the light for triangular symmetries. In contrast, a ground-state that has a broken…
Superexchange induced canted ferromagnetism in dilute magnets
Georges Bouzerar, Richard Bouzerar, Olivier Cepas
We argue, in contrast to recent studies, that the antiferromagnetic superexchange coupling between nearest neighbour spins does not fully destroy the ferromagnetism in dilute magne…
Instabilities and Insulator-Metal transitions in Half-Doped Manganites induced by Magnetic-Field and Doping
O. Cepas, H. R. Krishnamurthy, T. V. Ramakrishnan
We discuss the phase diagram of the two-orbital model of half-doped manganites by calculating self-consistently the Jahn-Teller (JT) distortion patterns, charge, orbital and magnet…
Degeneracy and Strong Fluctuation-Induced First-Order Phase Transition in the Dipolar Pyrochlore Antiferromagnet
O. Cepas, A. P. Young, B. S. Shastry
We show that a continuous set of degenerate critical soft modes strongly enhances the first-order character of a fluctuation-induced first-order transition in the pyrochlore dipola…
Doping and Field-Induced Insulator-Metal Transitions in Half-Doped Manganites
O. Cepas, H. R. Krishnamurthy, T. V. Ramakrishnan
We argue that many properties of the half-doped manganites may be understood in terms of a new two-(eg electron)-fluid description, which is energetically favorable at intermediate…