NMR in CeAl2: Crystal‐field effects and magnetic order in the low‐temperature phase

1978 ◽  
Vol 49 (3) ◽  
pp. 2121-2123 ◽  
Author(s):  
D. E. MacLaughlin ◽  
R. R. Hewitt
Keyword(s):  
Low Temperature ◽  
Crystal Field ◽  
Magnetic Order ◽  
Temperature Phase ◽  
Field Effects ◽  
Low Temperature Phase

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.

Static and dynamic crystal-field effects in ferrous fluosilicate

1987 ◽  
Vol 65 (10) ◽  
pp. 1280-1293 ◽  
Author(s):  
D. C. Price
Keyword(s):  
Low Temperature ◽  
Crystal Field ◽  
Metal Ion ◽  
Vibronic Coupling ◽  
Spin Lattice Relaxation ◽  
Temperature Phase ◽  
Relaxation Rates ◽  
Zinc Compounds ◽  
Crystal Fields ◽  
Low Temperature Phase

This paper examines the crystal fields acting on Fe2+ ions in ferrous fluosilicate, and the way that they influence the magnetic and spectroscopic properties of the compound. The crystal structures of ferrous fluosilicate and of the structurally similar magnesium, manganese, cobalt, nickel, and zinc compounds are described to establish the point symmetries of the metal-ion sites. In the low-temperature monoclinic (P21/c) phase of the Fe2+, Mg2+, Co2+, and Mn2+ compounds, although the metal-ion site is required crystallographically to have only inversion symmetry, all of the available low-temperature data are consistent with a crystal field of C2h symmetry. In the high-temperature phases of these salts, and for nickel and zinc fluosilicates at all temperatures, the site symmetries are either exactly or approximately C3i. The dominant effect of the phase transition on the Fe2+ crystal field in FeSiF6∙6H2O is to remove the nonaxial terms [Formula: see text] and [Formula: see text] that are present in the low-temperature phase. The other terms appear to be relatively unaffected.Both the time-dependent (spin-lattice relaxation) and time-independent (vibronic coupling) manifestations of the dynamic crystal field at the Fe2+ ions are qualitatively examined. A new interpretation of the 57Fe Mössbauer spectra of FeSiF6∙6H2O in the low-temperature phase is described, from which relaxation rates comparable to those deduced from other measurements are obtained. Evidence that the measured 57Fe Mössbauer quadrupole splittings of Fe2+ ions in FeSiF6∙6H2O and in ZnSiF6∙6H2O show significant effects of vibronic coupling is examined.

Low‐temperature phase formation in the SrF 2 ‐ LaF 3 system

2020 ◽  
Author(s):  
Pavel P. Fedorov ◽  
Alexander A. Alexandrov ◽  
Valery V. Voronov ◽  
Maria N. Mayakova ◽  
Alexander E. Baranchikov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Phase Formation ◽  
Temperature Phase ◽  
Low Temperature Phase

Unusual electronic properties of a low-temperature phase of Ag4SSe

2018 ◽  
Vol 2 (11) ◽  
Author(s):  
Shidaling Matteppanavar ◽  
Nguyen Hai An Bui ◽  
Srinivasan Ramakrishnan ◽  
Megha Vagadia ◽  
Arumugam Thamizhavel ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electronic Properties ◽  
Temperature Phase ◽  
Low Temperature Phase
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