TITLE

Effect of the exchange interaction anisotropy on the magnetic quantum phase transitions in dimerized antiferromagnets

AUTHOR(S)
Lyashenko, T. I.; Kalita, V. M.; Loktev, V. M.
PUB. DATE
August 2017
SOURCE
Low Temperature Physics;Aug2017, Vol. 43 Issue 8, p1002
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present a theoretical description of a quantum phase transition in a dimerized antiferromagnet, induced by an external magnetic field. The description of such transitions is constructed by determining the minimum of the Lagrange function which depends on the parameters of the groundstate crystal wavefunction. We determine that during a crystal transition from the singlet state of the dimer to the state with a noncollinear spin orientation, an order-order type phase transition occurs. We show that in the case of a single-axis character of the exchange anisotropy, the location of the quantum phase transition critical point is affected by the spin-spin interactions inside the dimer. Additionally, analogous to the classical Néele antiferromagnets, single-axis type anisotropic spin-spin interactions between dimers, shift the point of the spin-flip transition from the noncollinear antiferromagnetic phase to the ferromagnetic phase.
ACCESSION #
125543767

 

Related Articles

  • Tuning antiferromagnetic exchange interaction for spontaneous exchange bias in MnNiSnSi system. Liyun Jia; Jianlei Shen; Mengmeng Li; Xi Wang; Li Ma; Congmian Zhen; Denglu Hou; Enke Liu; Wenhong Wang; Guangheng Wu // APL Materials;2017, Vol. 5 Issue 12, p1 

    Based on almost all the data from the literature on spontaneous exchange bias (SEB), it is expected that the system will show SEB if it meets two conditions simultaneously: (i) there are the coexistence and competition of antiferromagnetic (AFM) and ferromagnetic (FM) interactions and (ii) AFM...

  • Pseudogap state near a quantum critical point. Efetov, K. B.; Meier, H.; Pépin, C. // Nature Physics;Jul2013, Vol. 9 Issue 7, p442 

    In the standard picture of a quantum phase transition, a single quantum critical point separates the phases at zero temperature. Here we show that the two-dimensional case is considerably more complex. Instead of the single point separating the antiferromagnet from the normal metal, we have...

  • Condensed matter: Graphene's topological insulation. Lau, Chun Ning (Jeanie) // Nature Physics;Mar2013, Vol. 9 Issue 3, p135 

    The article discusses a study related to the manifestation by graphene of properties which are analogous in topological insulation through a quantum phase transition from an antiferromagnetic to a ferromagnetic state. It notes that wavefunction components are indicated in the indices of spin of...

  • Two-dimensional solitons in spin nematic states for magnets with an isotropic exchange interaction. Galkina, E. G.; Ivanov, B. A.; Kosmachev, O. A.; Fridman, Yu. A. // Low Temperature Physics;2015, Vol. 41 Issue 5, p382 

    A study of two-dimensional topological vortex-like solitons, for spin nematic states in magnets with spin S=1 and S=3/2. Depending on the parameters of the magnet, we get either pure multipole vortices, with a quadrupole parameter for S=1, or an octupole parameter for S=3/2, or vortices with a...

  • Entanglement perturbation theory for infinite quasi-1D quantum systems. Wang, Lihua; Chung, Sung Gong // International Journal of Modern Physics B: Condensed Matter Phys;Mar2015, Vol. 29 Issue 7, p-1 

    We develop entanglement perturbation theory (EPT) for infinite Quasi-1D quantum systems. The spin-1/2 Heisenberg chain with ferromagnetic nearest neighbor (NN) and antiferromagnetic next nearest neighbor (NNN) interactions with an easy-plane anisotropy is studied as a prototypical system. The...

  • Numerical method for disordered quantum phase transitions in the large- N limit. Nozadze, David; Vojta, Thomas // Physica Status Solidi (B);Mar2014, Vol. 251 Issue 3, p675 

    We develop an efficient numerical method to study the quantum critical behavior of disordered systems with

  • Diffraction line-shapes, Fermi surface nesting, and quantum criticality in antiferromagnetic chromium at high pressure (invited). Jaramillo, R.; Yejun Feng; Rosenbaum, T. F. // Journal of Applied Physics;May2010, Vol. 107 Issue 9, p09E116-1 

    We explore the behavior of the nested bandstructure of chromium as a function of temperature and pressure to the point where magnetism disappears. X-ray diffraction measurements of the charge order parameter suggest that the nesting condition is maintained at high pressure, where the spin...

  • QUANTUM-CLASSICAL PHASE TRANSITION OF THE ESCAPE RATE OF TWO-SUBLATTICE ANTIFERROMAGNETIC LARGE SPINS. OWERRE, SOLOMON AKARAKA; PARANJAPE, M. B. // International Journal of Modern Physics B: Condensed Matter Phys;1/30/2014, Vol. 28 Issue 3, p-1 

    The Hamiltonian of a two-sublattice antiferromagnetic spins, with single (hard-axis) and double ion anisotropies described by is investigated using the method of effective potential. The problem is mapped to a single particle quantum-mechanical Hamiltonian in terms of the relative coordinate and...

  • Quantum discord and quantum phase transition in the XXZ spin chain with three-site interaction. Yang, Jing; Cong, Mei-Yan; Huang, Yan-Xia // Modern Physics Letters B;Dec2016, Vol. 30 Issue 34, p-1 

    Pairwise quantum discord (QD) and entanglement of the three-qubit XXZ Heisenberg spin chain with two types of three-site interactions and an external magnetic field are investigated. Our study found that both entanglement and quantum discord could detect the quantum critical phenomena of this...

  • Half-filled Kondo lattice on the honeycomb lattice. Zhong, Yin; Liu, Ke; Wang, Yu-Feng; Wang, Yong-Qiang; Luo, Hong-Gang // European Physical Journal B -- Condensed Matter;May2013, Vol. 86 Issue 5, p1 

    The unique linear density of state around the Dirac points for the honeycomb lattice brings much novel features in strongly correlated models. Here we study the ground-state phase diagram of the Kondo lattice model on the honeycomb lattice at half-filling by using an extended mean-field theory....

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics