Journal ArticleDOI
Phase Transition between the Spin-Flop and Paramagnetic Phases of the Heisenberg Antiferromagnet
TLDR
In this article, the spin-flop paramagnetic phase transition of the Heisenberg antiferromagnet in the limit of zero anisotropy is studied by a Green function theory in the random phase approximation for S = 1/2 and by a spin wave theory including spin wave interactions for general spin.Abstract:
The spin-flop paramagnetic phase transition of the Heisenberg antiferromagnet in the limit of zero anisotropy is studied by a Green function theory in the random phase approximation for S =1/2 and by a spin wave theory including spin wave interactions for general spin. The phase transition is found to be of first order at finite temperature and the angle θ between the spins and the direction of applied field changes discontinuously at the transition. The spin wave theory predicts a non-zero excitation energy gap in the limit of zero anisotropy in the spin-flop phase.read more
Citations
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A new method of nuclear spin cooling in the mK region, applied to 54Mn NMR/ON in antiferromagnetic MnCl2.4H2O
TL;DR: In this paper, a new method of cooling nuclear spins in the mK region, using antiferromagnetic magnons, is described, based on dramatic reduction in the spin-lattice relaxation time T1 at the spinflop and spin-flop-paramagnetic phase transitions induced respectively by fields 0.71 and 2.0 T applied along the easy axis (at 7 degrees to the c axis) of the hexagonal-shaped MnCl2.4H2O crystal.
Cosmic ray composition measurements and high energy ionization spectrometers
J. F. Arens,Jonathan F. Ormes +1 more
TL;DR: In this article, a balloon-borne instrument containing a total absorption ionization spectrometer was used to analyze the five measurements of each particle to determine its charge and energy, and corrections for Landau fluctuations, spark-chamber inefficiency, and background particles were included.
Journal ArticleDOI
Spin-Flop Transition and a Tilted Canted Spin Structure in a Coupled Antiferromagnet
Hiroshi Shimahara,Kazuhiro Ito +1 more
TL;DR: In this paper, the authors studied a uniaxial coupled Heisenberg antiferromagnet that consists of two subsystems of classical spins with small and large lengths and spin-flop transitions in a magnetic field parallel to the magnetic easy axis.
Journal ArticleDOI
Spin-flop-paramagnetic phase transition
TL;DR: In this article, a spin wave theory predicts that the SFP transition of the Heisenberg antiferromagnet is to be of first order, even in the zero anisotropy limit.
Journal ArticleDOI
The Heisenberg model: Dynamical interactions including odd-boson terms
C.A.M. Mulder,H.W. Capel +1 more
TL;DR: In this article, a general spin-wave Hamiltonian with up to four-boson terms is presented, where the linear boson terms of leading order in the 1/S expansion disappear, applying an appropriate boson shift or rotation in spin space before the Holstein-Primakoff transformation.
References
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Journal ArticleDOI
Two-period green's function in statistical physics
TL;DR: In this article, the principle properties of the two-period Green's function and their simplest application in irreversible process theory, in the theory of superconductors, in ferromagnetics, and in electron- lattice reactions in common metals and semiconductors are discussed.
Journal ArticleDOI
Statistical Mechanics and Field-Induced Phase Transitions of the Heisenberg Antiferromagnet
Journal ArticleDOI
Bicritical and tetracritical points in anisotropic antiferromagnetic systems
TL;DR: In this paper, a scaling description of the critical behavior of anisotropic antiferromagnets in both parallel and skew, uniform and staggered magnetic fields, in particular, the bicritical, spin-flop transition is discussed.
Journal ArticleDOI
Spin Flop, Supersolids, and Bicritical and Tetracritical Points
TL;DR: In this paper, a scaling theory for bicritical points, such as antiferromagnetic spinflop points, is introduced, with analogies to the upper $\ensuremath{\lambda}$ point in $^{4}\mathrm{He}$, where two distinct critical lines meet.
Journal ArticleDOI
Transitions and phase diagrams in an orthorhombic antiferromagnetic crystal
TL;DR: In this paper, Neel's molecular field model is applied to an orthorhombic antiferromagnetic crystal and its magnetic and caloric behavior is analyzed, with special attention given to the case that the external field is applied in the direction preferred for antiferromeagnetic alignment.
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