scholarly journals Effect of the magnetic field applied during cooling on magnetic hysteresis in the low-temperature phase of magnetite: First-order reversal curve (FORC) analysis

2007 ◽  
Vol 8 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. V. Smirnov
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Hysteresis ◽  
Temperature Phase ◽  
First Order ◽  
Low Temperature Phase ◽  
The Magnetic Field

The Nematic Character of a Hidden Ordered State revealed by Magnetic Fields.

2014 ◽  
Vol 1683 ◽  
Author(s):  
Peter S. Riseborough ◽  
S. G. Magalhaes ◽  
E.J. Calegari
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Low Temperature ◽  
Applied Field ◽  
Temperature Phase ◽  
Spin Quantization ◽  
Experimental Findings ◽  
Low Temperature Phase ◽  
The Magnetic Field ◽  
Ordered State

ABSTRACTWe examine a novel phase of the underscreened Anderson lattice Model that might pertain to the ”Hidden Ordered” phase of URu2Si2. We show that the system breaks spin-rotational invariance below the critical temperature and spontaneously selects a preferred axis of spin quantization. As a result, the low temperature phase exhibits a magnetic anisotropy, where the electronic properties depend not only on the magnitude of the magnetic field but also on the orientation of the applied field relative to the axis of quantization. The results are discussed in the context of recent experimental findings on URu2Si2.

scholarly journals Macroscopic degeneracy and order in the 3D plaquette Ising model

2015 ◽  
Vol 29 (20) ◽  
pp. 1550109 ◽  
Author(s):  
Desmond A. Johnston ◽  
Marco Mueller ◽  
Wolfhard Janke
Keyword(s):  
Low Temperature ◽  
Magnetic Order ◽  
Finite Size ◽  
Temperature Phase ◽  
Finite Size Scaling ◽  
First Order ◽  
Magnetic Order Parameter ◽  
First Order Transition ◽  
Definition Of ◽  
Low Temperature Phase

The purely plaquette 3D Ising Hamiltonian with the spins living at the vertices of a cubic lattice displays several interesting features. The symmetries of the model lead to a macroscopic degeneracy of the low-temperature phase and prevent the definition of a standard magnetic order parameter. Consideration of the strongly anisotropic limit of the model suggests that a layered, “fuki-nuke” order still exists and we confirm this with multi-canonical simulations. The macroscopic degeneracy of the low-temperature phase also changes the finite-size scaling corrections at the first-order transition in the model and we see this must be taken into account when analyzing our measurements.

Lattice Instabilities, Anharmonicity and Phase Transitions in PbTiO3 and PbZrO3

1995 ◽  
Vol 408 ◽  
Author(s):  
K. M. Rabe ◽  
U. V. Waghmare
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Structural Phase ◽  
Orthorhombic Phase ◽  
Cubic Phase ◽  
Temperature Phase ◽  
Structural Phase Transitions ◽  
Phonon Modes ◽  
First Order ◽  
Low Temperature Phase

AbstractMost perovskite structure oxides exhibit structural phase transitions from a hightemperature cubic phase to a distorted low-temperature phase which can be described by the freezing-in of one or more phonon modes of the cubic structure [1]. The first-order cubic-tetragonal ferroelectric transition in PbTiO3 at Tc = 763 K involves the freezing-in of a single F15 polar mode. In PbZrO3 , the structure of the antiferroelectric low-temperature orthorhombic phase is far more complicated, with forty atoms per unit cell and the freezing-in of R25 and Σ3 modes, perhaps accompanied by other modes as well [2][3].

scholarly journals Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
Shreyas Muralidhar ◽  
Joachim Gräfe ◽  
Yu-Chun Chen ◽  
Martin Etter ◽  
Giuliano Gregori ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Phase ◽  
Temperature Dependent ◽  
First Order ◽  
Low Temperature Phase

Order–disorder phenomena determined by high-resolution powder diffraction: the structures of tetrakis(trimethylsilyl)methane C[Si(CH3)3]4 and tetrakis(trimethylsilyl)silane Si[Si(CH3)3]4

1999 ◽  
Vol 55 (6) ◽  
pp. 1014-1029 ◽  
Author(s):  
Robert E. Dinnebier ◽  
Wayne A. Dollase ◽  
Xavier Helluy ◽  
Jörg Kümmerlen ◽  
Angelika Sebald ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Intermediate Phase ◽  
Lattice Parameter ◽  
Temperature Phase ◽  
Space Group ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase ◽  
Low Temperature Phase

The compounds tetrakis(trimethylsilyl)methane C[Si(CH3)3]4 (TC) and tetrakis(trimethylsilyl)silane Si[Si(CH3)3]4 (TSi) have crystal structures with the molecules in a cubic closed-packed (c.c.p.) stacking. At room temperature both structures have space group Fm{\bar 3}m (Z = 4) with a = 13.5218 (1) Å, V = 2472.3 (1) Å3 for TSi, and a = 12.8902 (2) Å, V = 2141.8 (1) Å3 for TC. X-ray scattering data can be described by a molecule with approximately sixfold orientational disorder, ruling out a structure with free rotating molecules. Upon cooling, TSi exhibits a first-order phase transition at T c = 225 K, as is characterized by a jump of the lattice parameter of Δa = 0.182 Å and by an exothermal maximum in differential scanning calorimetry (DSC) with ΔH = 11.7 kJ mol−1 and ΔS = 50.0 J mol−1 K−1. The structure of the low-temperature phase is refined against X-ray powder data measured at 200 K. It has space group P2 13 (Z = 4), a = 13.17158 (6) Å and V = 2285.15 (2) Å3. The molecules are found to be ordered as a result of steric interactions between neighboring molecules, as is shown by analyzing distances between atoms and by calculations of the lattice energy in dependence on the orientations of the molecules. TC has a phase transition at T c1 = 268 K, with Δa 1 = 0.065 Å, ΔH 1 = 3.63 kJ mol−1 and ΔS 1 = 13.0 J mol−1 K−1. A second first-order phase transition occurs at T c2 = 225 K, characterized by Δa 2 = 0.073 Å, ΔH 2 = 6.9 kJ mol−1 and ΔS 2 = 30.0 J mol−1 K−1. The phase transition at higher temperature has not been reported previously. New NMR experiments show a small anomaly in the temperature dependence of the peak positions in NMR to occur at T c2. Rietveld refinements were performed for the low-temperature phase measured at T = 150 K [space group P2 13, lattice parameter a = 12.609 (3) Å], and for the intermediate phase measured at T = 260 K [space group Pa{\bar 3}, lattice parameter a = 12.7876 (1) Å]. The low-temperature phase of TC is formed isostructural to the low-temperature phase of TSi. In the intermediate phase the molecules exhibit a twofold orientational disorder.

Low‐temperature phase of yttrium iron garnet (YIG) and its first‐order magnetoelectric effect

1988 ◽  
Vol 64 (10) ◽  
pp. 5659-5661 ◽  
Author(s):  
Eiji Kita ◽  
Shunsuke Takano ◽  
Akira Tasaki ◽  
Kiiti Siratori ◽  
Kay Kohn ◽  
...  
Keyword(s):  
Low Temperature ◽  
Yttrium Iron Garnet ◽  
Magnetoelectric Effect ◽  
Temperature Phase ◽  
Yttrium Iron ◽  
First Order ◽  
Iron Garnet ◽  
Low Temperature Phase
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