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16 papers
Dual nature of improper ferroelectricity in a magnetoelectric multiferroic
Silvia Picozzi, Kunihiko Yamauchi, Biplab Sanyal +2
Using first principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelect…
Universal emergence of the one-third plateau in the magnetization process of frustrated quantum spin chains
F. Heidrich-Meisner, I. A. Sergienko, A. E. Feiguin +1
We present a numerical study of the magnetization process of frustrated quantum spin-S chains with S=1, 3/2, 2 as well as the classical limit. Using the exact diagonalization and d…
Superconducting gap nodes in PrOs_4Sb_12
S. H. Curnoe, T. R. Abu Alrub, I. A. Sergienko +1
We examine the superconducting gap nodes in crystals with tetrahedral (T_h) symmetry. The (0,0,1) phase of the three dimensional order parameter in the triplet channel has nodes in…
Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
I. A. Sergienko, C. Sen, E. Dagotto
We show that the symmetry of the spin zigzag chain E phase of the orthorhombic perovskite manganites and nickelates allows for the existence of a finite ferroelectric polarization.…
Study of the One- and Two-Band Models for Colossal Magnetoresistive Manganites Using the Truncated Polynomial Expansion Method
C. Sen, G. Alvarez, Y. Motome +5
Considerable progress has been recently made in the theoretical understanding of the colossal magnetoresistance (CMR) effect in manganites. The analysis of simple models with two c…
Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
I. A. Sergienko, E. Dagotto
With the perovskite multiferroic RMnO3 (R = Gd, Tb, Dy) as guidance, we argue that the Dzyaloshinskii-Moriya interaction (DMI) provides the microscopic mechanism for the coexistenc…