Is a strong axial crystal-field the only essential condition for a large magnetic anisotropy barrier? The case of non-Kramers Ho(iii) versus Tb(iii )

2018 ◽  
Vol 47 (2) ◽  
pp. 357-366 ◽  
Author(s):  
Sandeep K. Gupta ◽  
Thayalan Rajeshkumar ◽  
Gopalan Rajaraman ◽  
Ramaswamy Murugavel
Keyword(s):  
High Temperature ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Ligand Field ◽  
Essential Condition ◽  
Equatorial Ligand

This study highlights that although strong axiality holds the key for designing high temperature SMMs based on non-Kramers ions, the strength of the equatorial ligand field, although small, cannot be ignored.

scholarly journals EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 377-383
Author(s):  
Czesław Rudowicz ◽  
Mirosław Karbowiak
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Recent Literature ◽  
Ligand Field ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Effective Spin ◽  
Spin Hamiltonians

Abstract The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-field splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.

scholarly journals Engineering macrocyclic high performance pentagonal bipyramidal Dy(iii) single-ion magnets

2020 ◽  
Vol 56 (80) ◽  
pp. 12037-12040 ◽  
Author(s):  
Angelos B. Canaj ◽  
Sourav Dey ◽  
Claire Wilson ◽  
Oscar Céspedes ◽  
Gopalan Rajaraman ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
High Performance ◽  
Ligand Field ◽  
Equatorial Ligand

We highlight the vast synthetic scope for macrocyclic engineering of magnetic anisotropy, generating a high performance pentagonal bipyramidal Dy(iii) single-ion magnet where the weak equatorial ligand field is created entirely by using a macrocycle.

Titanohematite lattice-preferred orientation and magnetic anisotropy in high-temperature mylonites

2002 ◽  
Vol 198 (1-2) ◽  
pp. 77-92 ◽  
Author(s):  
Jérôme Bascou ◽  
M.Irene B. Raposo ◽  
Alain Vauchez ◽  
Marcos Egydio-Silva
Keyword(s):  
High Temperature ◽  
Magnetic Anisotropy ◽  
Preferred Orientation ◽  
Lattice Preferred Orientation

scholarly journals Correlating Axial and Equatorial Ligand Field Effects to the Single-Molecule Magnet Performances of a Family of Dysprosium Bis-Methanediide Complexes

2021 ◽  
Author(s):  
Lewis Thomas-Hargreaves ◽  
Marcus Giansiracusa ◽  
Matthew Gregson ◽  
Emanuele Zanda ◽  
Felix O'Donnell ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Single Molecule ◽  
Ligand Field ◽  
Single Molecule Magnet ◽  
Field Effects ◽  
Equatorial Ligand ◽  
Metal Alkyls

Treatment of the new methanediide-methanide complex [Dy(SCS)(SCSH)(THF)] (1Dy, SCS = {C(PPh2S)2}2-) with alkali metal alkyls and auxillary ethers produces the bis-methanediide complexes [Dy(SCS)2][Dy(SCS)2(K(DME)2)2] (2Dy), [Dy(SCS)2][Na(DME)3] (3Dy) and [Dy(SCS)2][K(2,2,2-cryptand)] (4Dy). For...

Magnetic Anisotropy in Single Crystals of Zn–Mn and Zn–Cr

1974 ◽  
Vol 52 (18) ◽  
pp. 1759-1764 ◽  
Author(s):  
F. T. Hedgcock ◽  
S. Lenis ◽  
P. L. Li ◽  
J. O. Ström-Olsen ◽  
E. F. Wassermann
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Crystal Field ◽  
Interaction Effects ◽  
Crystal Field Splitting ◽  
High Magnetic Fields ◽  
Field Splitting ◽  
Chromium Ion

We have extended the low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 600 p.p.m. manganese from magnetic fields of 9 to 56 kG. The crystal field splitting parameters determined at low magnetic fields also characterizes the magnetic anisotropy at high magnetic fields. Manganese–manganese interaction effects are observed in the magnetic anisotropy at manganese concentrations greater than 300 p.p.m. Low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 164 p.p.m. chromium are reported and indicate a crystal field splitting of 0.16 K for the chromium ion.

Magnetic anisotropy on demand exploiting high-pressure as remote control: an ab initio proof-of-concept

2021 ◽  
Author(s):  
Matteo Briganti ◽  
Federico Totti
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Remote Control ◽  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Single Molecule ◽  
Boiling Temperature ◽  
Proof Of Concept ◽  
Single Molecule Magnets ◽  
On Demand

Lanthanide based single molecule magnets have recently become very promising systems for creating single molecule device working at high temperature (nitrogen boiling temperature). However, the variation of direction of the...

Magnetische Eigenschaften der Normaltemperaturform von CsTmO2 / Magnetic Properties of the Normal-Temperature Form of CsTmO2

1979 ◽  
Vol 34 (8) ◽  
pp. 997-1002 ◽  
Author(s):  
Werner Urland
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Ground State ◽  
Low Temperatures ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Angular Overlap Model ◽  
Temperature Form ◽  
Overlap Model

AbstractThe magnetic behaviour of the normal-temperature-form of CsTmO2 (NT-CsTmO2) has been studied in the temperature range between 2.9 and 251.3 K. In order to interpret the magnetic data a method applying the angular overlap model has been established to assess the crystal-field (CF) parameters of NT-CsTmO2 (CF symmetry: D3d) from the known CF parameters for Tm3+ substituted in YVO4 (CF symmetry: D2d)-With these CF parameters the observed magnetic properties of NT-CsTmO2 can be satisfactorily simulated. The calculation of the paramagnetic principal susceptibilities yields a high magnetic anisotropy, especially at low temperatures. The energy values of the CF levels of the 3H6 ground state are calculated.

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