Hall Viscosity and Electromagnetic Response

Carlos Hoyos and Dam Thanh Son
We show that, for Galilean invariant quantum Hall states, the Hall viscosity appears in the electromagnetic response at finite wave numbers q. In particular, the leading q dependence of the Hall conductivity at small q receives a contribution from the Hall viscosity. The coefficient of the q term in ... [Phys. Rev. Lett. 108, 066805 ] published .

Competing orders in the Dirac-like electronic structure and the nonlinear sigma model with a topological term

Pouyan Ghaemi and Shinsei Ryu
The Dirac-like electronic structure can host a large number of competing orders in the form of mass terms. In particular, two different order parameters can be said to be dual to each other, when a static defect in one of them traps a quantum number (or charge) of the other. We discuss that such com ... [Phys. Rev. B 85, 075111 ] published .

Phase transitions in spin-orbital models with spin-space anisotropies for iron pnictides: Monte Carlo simulations

Ryan Applegate, Rajiv R. P. Singh, Cheng-Chien Chen, and Thomas P. Devereaux
The common phase diagrams of superconducting iron pnictides show interesting material specificities in the structural and magnetic phase transitions. In some cases the two transitions are separate and second order, while in others they appear to happen concomitantly as a single first-order transitio ... [Phys. Rev. B 85, 054411 ] published .

Enhancement of ferromagnetism in Ni excess CuNiMnSb half Heusler alloys

B. L. Ahuja, Alpa Dashora, Shailja Tiwari, H. S. Mund, Madhumita Halder et al.
Spin momentum densities of CuNiMnSb (for x = 0.17 and 0.22), derived from experimental magnetic Compton profiles (MCPs), show an increase in magnetic moment while going from x = 0.17 --> 0.22, which is attributed to Mn 3d states. MCPs along with magnetization data suggest a negligible contribution o ... [J. Appl. Phys. 111, 033914 (2012)] published Thu Feb 9, 2012.

Angular and frequency dependence of standing spin waves in FePt films

D. M. Jacobi, E. Sallica Leva, N. Alvarez, M. Vasquez Mansilla, J. Gomez et al.
We present a detailed analysis of the dynamic response of the magnetization in as-made FePt thin films, particularly studying the angular dependence of standing spin waves that can be observed when the external field is applied close to the film normal. We have found that the field separation betwee ... [J. Appl. Phys. 111, 033911 (2012)] published Thu Feb 9, 2012.

Magnetic transitions in erbium at high pressures

Sarah A. Thomas, Georgiy M. Tsoi, Lowell E. Wenger, Yogesh K. Vohra, and Samuel T. Weir
Electrical resistance measurements have been carried out on polycrystalline erbium (Er) at temperatures down to 10 K and pressures up to 20 GPa. An abrupt change in the slope of the resistance is observed with decreasing temperature below 84 K which is associated with the c-axis modulated antiferrom ... [J. Appl. Phys. 111, 07E104 (2012)] published Thu Feb 9, 2012.

Reduction of hysteresis loss and large magnetocaloric effect in the C- and H-doped La(Fe, Si) compounds around room temperature

H. Zhang, B. G. Shen, Z. Y. Xu, X. Q. Zheng, J. Shen et al.
The effects of the interstitial C and H atoms on the phase formation, the hysteresis loss, and magnetocaloric effects of the NaZn-type La(Fe, Si) compounds are investigated. It is found that the annealing time to obtain a 1:13 structure is significantly reduced from 40 days for LaFeSi to a week for ... [J. Appl. Phys. 111, 07A909 (2012)] published Thu Feb 9, 2012.

Magnetocaloric effect in LaPrFeSi compounds with a combined addition of Co and C

Jun Shen and Jin-Liang Zhao
The influence of a combined addition of Co and C on the magnetocaloric effect in the LaPrFeSi compound is investigated. The addition of Co and C can adjust Curie temperature (T) to around room temperature. Although the magnetic entropy change (DeltaS) of LaPrFeCoSiC decreases with the increase of x, ... [J. Appl. Phys. 111, 07A908 (2012)] published Thu Feb 9, 2012.

Non-Abelian Braiding of Lattice Bosons

Eliot Kapit, Paul Ginsparg, and Erich Mueller
We report on a numerical experiment in which we use time-dependent potentials to braid non-Abelian quasiparticles. We consider lattice bosons in a uniform magnetic field within the fractional quantum Hall regime, where nu, the ratio of particles to flux quanta, is near 1/2, 1, or 3/2. We introduce t ... [Phys. Rev. Lett. 108, 066802 ] published .

Interplay between interaction and chiral anomaly in the holographic approach

Ki-Seok Kim and Takuya Tsukioka
Strongly coupled conformal field theory appears to describe universal scaling around quantum criticality, where critical exponents reflect the nature of emergent excitations. In particular, novel symmetries can emerge from strong interactions that are expected to be responsible for quantum number fr ... [Phys. Rev. D 85, 045011 ] published .

Spin reorientation transition and hard magnetic properties of MnBi intermetallic compound

K. Suzuki, X. Wu, V. Ly, T. Shoji, A. Kato et al.
The effects of mechanical grinding (MG) on the crystallite size, the spin reorientation transition temperature (T) and the hard magnetic properties in melt-spun low temperature phase (LTP) MnBi have been investigated in order to understand the origin of magnetic hardening induced by MG. The room-tem ... [J. Appl. Phys. 111, 07E303 (2012)] published Wed Feb 8, 2012.

Electronic and magnetic properties of substitutionally Fe-, Co-, and Ni-doped BC honeycomb structure

Xianqing Lin and Jun Ni
First-principles calculations have been performed to investigate the electronic and magnetic properties of BC honeycomb structure (2D BC) substitutionally doped with Fe, Co, and Ni. 2D BC is a semiconductor with a mediate bandgap. When substituting for B, the Fe, Co, and Ni impurity atoms exhibit di ... [J. Appl. Phys. 111, 034309 (2012)] published Wed Feb 8, 2012.

Full configuration interaction perspective on the homogeneous electron gas

James J. Shepherd, George Booth, Andreas Gruneis, and Ali Alavi
Highly accurate results for the homogeneous electron gas (HEG) have only been achieved to date within a diffusion Monte Carlo (DMC) framework. Here, we introduce a recently developed stochastic technique, full configuration interaction quantum Monte Carlo (FCIQMC), which samples the exact wave funct ... [Phys. Rev. B 85, 081103 ] published .

Ground-state degeneracy in the Levin-Wen model for topological phases

Yuting Hu, Spencer D. Stirling, and Yong-Shi Wu
We study the properties of topological phases by calculating the ground-state degeneracy (GSD) of the two-dimensional Levin-Wen (LW) model. Here it is explicitly shown that the GSD depends only on the spatial topology of the system. Then we show that the ground state on a sphere is always nondegener ... [Phys. Rev. B 85, 075107 ] published .

Extended dual description of Mott transition beyond two-dimensional space

Yin Zhong, Ke Liu, and Hong-Gang Luo
Motivated by the recent paper of Mross and Senthil [Phys. Rev. B 84, 165126 (2011)], which provides a dual description for a Mott transition from a Fermi liquid to a quantum-spin liquid in two space dimensions, we extend their approach to higher-dimensional cases, and we provide explicit formalism i ... [Phys. Rev. B 85, 075106 ] published .

Effects of magnetic field, anisotropy, and biquadratic interactions in type-IIA fcc antiferromagnets studied by linear spin-wave theory

Trinanjan Datta and Dao-Xin Yao
We study the spin dynamics in a 3D quantum antiferromagnet on a face-centered-cubic (fcc) lattice. The effects of magnetic field, single-ion anisotropy, and biquadratic interactions are investigated using linear spin-wave theory with spins in a canted basis about the type-IIA fcc antiferromagnetic g ... [Phys. Rev. B 85, 054409 ] published .

Electron resonance and magnetic response of low-doped LaCaMnO and LaSrMnO manganite single crystals

E. Rozenberg, A. I. Shames, M. I. Tsindlekht, I. Felner, and Ya. M. Mukovskii
Ferromagnetic resonance and ac/dc magnetic properties of the low-doped LaCaMnO and LaSrMnO manganite single crystals were studied below (down to 5 K) their paramagnetic-ferromagnetic phase transition. It appears that technologically driven chemical/structural disorder inherent to low-doped manganite ... [J. Appl. Phys. 111, 07D702 (2012)] published Tue Feb 7, 2012.

Oscillatory magnetic anisotropy due to quantum well states in thin ferromagnetic films (invited)

M. Przybylski, M. Dabrowski, U. Bauer, M. Cinal, and J. Kirschner
Magnetic anisotropy depends strongly on the density of states at the Fermi level. If significant contributions to magnetocrystalline anisotropy energy (MAE) are due to spin-polarized quantum well states (QWS), a significant increase of MAE can occur periodically as a function of film thickness. The ... [J. Appl. Phys. 111, 07C102 (2012)] published Tue Feb 7, 2012.

Superconductivity Induced by Longitudinal Ferromagnetic Fluctuations in UCoGe

T. Hattori, Y. Ihara, Y. Nakai, K. Ishida, Y. Tada et al.
From detailed angle-resolved NMR and Meissner measurements on a ferromagnetic (FM) superconductor UCoGe (T~2.5 K and T~0.6 K), we show that superconductivity in UCoGe is tightly coupled with longitudinal FM spin fluctuations along the c axis. We found that magnetic fields along the c axis (H||c) s ... [Phys. Rev. Lett. 108, 066403 ] published .

Giant negative magnetoresistance in high-mobility two-dimensional electron systems

A. T. Hatke, M. A. Zudov, J. L. Reno, L. N. Pfeiffer, and K. W. West
We report on a giant negative magnetoresistance in very high mobility GaAs/AlGaAs heterostructures and quantum wells. The effect is the strongest at B~=1 kG, where the magnetoresistivity develops a minimum emerging at T<~2 K. Unlike the zero-field resistivity which saturates at T~=2 K, the resistivi ... [Phys. Rev. B 85, 081304 ] published .

Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrites at the spin reorientation transition

M. LoBue, V. Loyau, F. Mazaleyrat, A. Pasko, V. Basso et al.
We report on the magnetic field induced isothermal entropy change, Deltas(H, T), of W-type ferrite with CoZn substitution. Entropy measurements are performed by direct calorimetry. Single crystals of the composition BaCoZnFeO, prepared by the flux method, are measured at different fixed temperatures ... [J. Appl. Phys. 111, 07A905 (2012)] published Mon Feb 6, 2012.

Ab initio calculation of the local magnetic moment in titanium doped zinc oxide with a corrected-band-gap scheme

Bin Shao, Hong Liu, Jian Wu, and Xu Zuo
The local magnetic moment of Ti:ZnO is calculated from first principles by using the corrected-band-gap scheme (CBGS). The result shows that the system is magnetic with the magnetization of 0.699 [mu] per dopant. The origin of the local magnetic moment is considered to be the impurity band partially ... [J. Appl. Phys. 111, 07C301 (2012)] published Mon Feb 6, 2012.

The partitioning of Dy and Tb in NdFeB magnets: A first-principles study

X. B. Liu and Z. Altounian
Doping with Dy/Tb is a current solution to improve the coercivity and the operating temperature of NdFeB magnets, by increasing the magnetocrystalline anisotropy of the (Nd, Dy/Tb)FeB (2:14:1) phase. The efficiency of Dy/Tb doping depends on the distribution of Dy/Tb in the multi-phase microstructur ... [J. Appl. Phys. 111, 07A701 (2012)] published Mon Feb 6, 2012.

Entropy change linked to the magnetic field induced Morin transition in Hematite nanoparticles

J. M. Pastor, J. I. Perez-Landazabal, C. Gomez-Polo, V. Recarte, S. Larumbe et al.
The most stable form of iron oxide is Hematite (alpha-FeO), which has interesting electronic, catalytic, and magnetic properties showing size dependent characteristics. At room temperature, Hematite is weakly ferromagnetic with a rhombohedral corundum structure. Upon cooling, the structure undergoes ... [Appl. Phys. Lett. 100, 063102 (2012)] published Mon Feb 6, 2012.

Single-valley quantum Hall ferromagnet in a dilute MgZnO/ZnO strongly correlated two-dimensional electron system

Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell et al.
We investigate the spin susceptibility (gm) of dilute two-dimensional (2D) electrons confined at the MgZnO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of gm, dominated by the increase in the Lande g-factor. The g-factor enhancement leads to a ferromagnetic instabi ... [Phys. Rev. B 85, 075302 ] published .

Many-body effects on the capacitance of multilayers made from strongly correlated materials. (arXiv:1202.1844v1 [cond-mat.str-el])

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Strongly correlated electronic states and quasi-two-dimensionalantiferromagnetism in honeycomb lattice compound In$_{3}$Cu$_{2}$VO$_{9}$. (arXiv:1202.1861v1 [cond-mat.supr-con])

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Roles of Critical Valence Fluctuations in Ce- and Yb-Based Heavy Fermion Metals. (arXiv:1202.1862v1 [cond-mat.str-el])

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Magnetic ordering and multiferroicity in MnI$_2$. (arXiv:1202.1884v1 [cond-mat.str-el])

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Stripes and electronic quasiparticles in the pseudogap state of cuprate superconductors. (arXiv:1202.1913v1 [cond-mat.supr-con])

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Exact diagonalization of the one dimensional Bose-Hubbard model with local 3-body interactions. (arXiv:1202.1932v1 [cond-mat.str-el])

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Microscopic origin of large negative magneto-electric coupling in Sr$_{1/2}$Ba$_{1/2}$MnO$_{3}$. (arXiv:1202.2069v1 [cond-mat.mtrl-sci])

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A refinement of entanglement entropy and the number of degrees of freedom. (arXiv:1202.2070v1 [hep-th])

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Extended quantum criticality of low-dimensional superconductors near a spin-density-wave instability. (arXiv:1202.2099v1 [cond-mat.str-el])

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Effect of Strong Disorder in a 3-Dimensional Topological Insulator: Phase Diagram and Maps of the Z2 Invariant. (arXiv:1202.2108v1 [cond-mat.dis-nn])

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Quantum phase transitions in semi-local quantum liquids. (arXiv:1108.0425v2 [hep-th] UPDATED)

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Hierarchical Nature of the Quantum Hall Effects. (arXiv:1108.1624v2 [cond-mat.mes-hall] UPDATED)

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Fractional quantum-Hall liquid spontaneously generated by strongly correlated t_2g electrons. (arXiv:1109.5955v2 [cond-mat.str-el] UPDATED)

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Confinement: a real-time visualization. (arXiv:1111.0275v2 [cond-mat.str-el] UPDATED)

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Spin Dependent Thermoelectric Currents of Tunnel Junctions, Small Rings and Quantum Dots: Onsager Theory. (arXiv:1112.1379v2 [cond-mat.stat-mech] UPDATED)

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Topological invariants for interacting topological insulators with inversion symmetry. (arXiv:1201.6431v2 [cond-mat.str-el] UPDATED)

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Ca2Y2Cu5O10: the first frustrated quasi-1D ferromagnet close to criticality. (arXiv:1201.6663v2 [cond-mat.str-el] UPDATED)

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