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Altermagnetism in Folded Iron Chain Systems
Ling-Fang Lin, Yang Zhang, Satoshi Okamoto +3
Altermagnetism, a moment-compensated magnetism with momentum-dependent spin splitting, has so far been realized primarily in Néel-type antiferromagnets. Here, we demonstrate alterm…
Novel phenomena in transition-metal oxide thin films and heterostructures with strong correlations and spin-orbit coupling
Satoshi Okamoto, Narayan Mohanta, Ho Nyung Lee +2
Transition-metal oxides have been a central subject of condensed matter physics for decades. In addition to novel electronic states driven by the influence of strong correlation, r…
First-principles study of the low-temperature charge density wave phase in the quasi-one-dimensional Weyl chiral compound (TaSe)I
Yang Zhang, Ling-Fang Lin, Adriana Moreo +2
Using {\it ab initio} density functional theory, we study the lattice phase transition of quasi-one-dimensional (TaSe)I. In the undistorted state, the strongly anisotropic…
Quasi-one-dimensional ferroelectricity and piezoelectricity in WO halogens
Ling-Fang Lin, Yang Zhang, Adriana Moreo +2
A series of oxytetrahalides WO (: a halogen element) that form quasi-one-dimensional chains is investigated using first-principles calculations. The crystal structures, ele…
Frustrated Dipole Order Induces Noncollinear Proper Ferrielectricity in Two Dimensions
Ling-Fang Lin, Yang Zhang, Adriana Moreo +2
Within Landau theory, magnetism and polarity are homotopic, displaying a one-to-one correspondence between most physical characteristics. However, despite widely reported noncollin…
Magnetoelectricity in Multiferroics: a Theoretical Perspective
Shuai Dong, Hongjun Xiang, Elbio Dagotto
The key physical property of multiferroic materials is the existence of a coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of mag…
Sequential structural and antiferromagnetic transitions in BaFeSe under pressure
Yang Zhang, Ling-Fang Lin, Jun-Jie Zhang +2
The discovery of superconductivity in the two-leg ladder compound BaFeS has established the 123-type iron chalcogenides as a novel and interesting subgroup of the iron-base…
Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in two-leg ladders Fe (=Ba or K, =S or Se)
Yang Zhang, Lingfang Lin, Jun-Jie Zhang +2
The recent discovery of superconductivity in BaFeS [Takahashi {\it et al.}, Nat. Mater. {\bf 14}, 1008 (2015)] has stimulated considerable interest in 123-type iron chalcog…
Inversion of ferrimagnetic magnetization by ferroelectric switching via a novel magnetoelectric coupling
Yakui Weng, Lingfang Lin, Elbio Dagotto +1
Although several multiferroic materials/heterostructures have been extensively studied, finding strong magnetoelectric couplings for the electric field control of the magnetization…
Canted Magnetic Ground State of Quarter-Doped Manganites CaMnO ( = Y, Tb, Dy, Ho, and Er)
R. Sinclair, H. B. Cao, V. O. Garlea +6
Polycrystalline samples of the quarter-doped manganites CaMnO ( = Y, Tb, Dy, Ho, and Er) were studied by X-ray diffraction and AC/DC susceptibility measur…
BaFeSe: a high magnetic multiferroic with large ferrielectric polarization
Shuai Dong, J. -M. Liu, Elbio Dagotto
The iron-selenides are important because of their superconducting properties. Here, an unexpected phenomenon is predicted to occur in an iron-selenide compound with a quasi-one-dim…
Competition between covalent bonding and charge transfer at complex-oxide interfaces
Juan Salafranca, Julian Rincon, Javier Tornos +5
Here we study the electronic properties of cuprate/manganite interfaces. By means of atomic resolution electron microscopy and spectroscopy, we produce a subnanometer scale map of…
First Principles Study of the Magnetic Properties of LaOMnAs
Shuai Dong, Wei Li, Xin Huang +1
Recent experiments reported giant magnetoresistance at room temperature in LaOMnAs. Here a density functional theory calculation is performed to investigate magnetic properties of…
Tunneling Electroresistance Induced by Interfacial Phase Transitions in Ultrathin Oxide Heterostructures
Lu Jiang, Woo Seok Choi, Hyoungjeen Jeen +8
The ferroelectric (FE) control of electronic transport is one of the emerging technologies in oxide heterostructures. Many previous studies in FE tunnel junctions (FTJs) exploited…
Full Control of Magnetism in Manganite Bilayer by Ferroelectric Polarization
Shuai Dong, Elbio Dagotto
An oxide heterostructure made of manganite bilayers and ferroelectric perovskites is predicted to lead to the full control of magnetism when switching the ferroelectric polarizatio…
Quantum-Confinement-Induced Magnetism in LaNiO-LaMnO Superlattices
Shuai Dong, Elbio Dagotto
The emergence of magnetic reconstructions at the interfaces of oxide heterostructures are often explained via subtle modifications in the electronic densities, exchange couplings,…
Ab Initio Study of the Intrinsic Exchange Bias at the SrRuO/SrMnO Interface
Shuai Dong, Qinfang Zhang, Seiji Yunoki +2
In a recent publication (S. Dong et al., Phys. Rev. Lett.103, 127201 (2009)), two (related) mechanisms were proposed to understand the intrinsic exchange bias present in oxides het…
Microscopic model for the ferroelectric field effect in oxide heterostructures
Shuai Dong, Xiaotian Zhang, Rong Yu +2
A microscopic model Hamiltonian for the ferroelectric field effect is introduced for the study of oxide heterostructures with ferroelectric components. The long-range Coulomb inter…
Complex State Found in the CMR Regime of Models for Colossal Magnetoresistive Manganites
Cengiz Sen, Shuhua Liang, Elbio Dagotto
In this report, we study in detail the competitor to the FM metallic state at electronic density in the CMR regime using the two-orbital double-exchange model with Jahn-Tel…
Antiferromagnetic transitions in `T-like' BiFeO3
G. J. MacDougall, H. M. Christen, W. Siemons +5
Recent studies have reported the existence of an epitaxially-stabilized tetragonal-like ('T-like') monoclinic phase in BiFeO3 thin-films with high levels of compressive strain. Whi…
Multiferroic Properties of CaMnO
Guoquan Zhang, Shuai Dong, Zhibo Yan +5
We report that CaMnO is a new magnetic multiferroic material. The appearance of a ferroelectric polarization coinciding with the magnetic phase transition ( K) s…
Exchange bias driven by the Dzyaloshinskii-Moriya interaction and ferroelectric polarization at G-type antiferromagnetic perovskite interfaces
Shuai Dong, Kunihiko Yamauchi, Seiji Yunoki +6
Exchange bias is usually rationalized invoking spin pinning effects caused by uncompensated antiferromagnetic interfaces. However, for compensated antiferromagnets other extrinsic…
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…
The Crossover from Impurity to Valence Band in Diluted Magnetic Semiconductors: The Role of the Coulomb Attraction by Acceptor
F. Popescu, C. Şen, E. Dagotto +1
The crossover between an impurity band (IB) and a valence band (VB) regime as a function of the magnetic impurity concentration in models for diluted magnetic semiconductors (DMS)…