scholarly journals Tb-based silicate apatites showing slow magnetization relaxation with identical parameters for the Tb3+ and Dy3+ counter ions

RSC Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 6926-6933
Author(s):  
Mikhail A. Zykin ◽  
Andrey K. Dyakonov ◽  
Artem A. Eliseev ◽  
Lev A. Trusov ◽  
Reinhard K. Kremer ◽  
...  
Keyword(s):  
Slow Relaxation ◽  
Magnetization Relaxation ◽  
Counter Ions ◽  
Apatite Type

Replacing Dy3+ with Tb3+ in the apatite-type silicate (Dy,Y)8Ca2(SiO4)6O2 preserves the character of the magnetization slow relaxation.

scholarly journals A Co-based single-molecule magnet confined in a barium phosphate apatite matrix with a high energy barrier for magnetization relaxation

2017 ◽  
Vol 53 (39) ◽  
pp. 5416-5419 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Artem A. Eliseev ◽  
Oxana V. Magdysyuk ◽  
...  
Keyword(s):  
High Spin ◽  
Single Molecule ◽  
Energy Barrier ◽  
High Energy ◽  
Magnetization Relaxation ◽  
Single Molecule Magnet ◽  
High Energy Barrier ◽  
Spin Reversal ◽  
Type Lattice ◽  
Apatite Type

A Co-ion introduced into the trigonal channel of an apatite-type lattice forms a magnetically anisotropic two-coordinated Co-complex with a record-high spin-reversal energy barrier.

pH-controlled polymorphism in a layered dysprosium phosphonate and its impact on the magnetization relaxation

2015 ◽  
Vol 51 (13) ◽  
pp. 2649-2652 ◽  
Author(s):  
Dai Zeng ◽  
Min Ren ◽  
Song-Song Bao ◽  
Jian-Shen Feng ◽  
Li Li ◽  
...  
Keyword(s):  
Slow Relaxation ◽  
Energy Barriers ◽  
Magnetization Relaxation ◽  
Ph Controlled

This communication reports two polymorphic dysprosium compounds that exhibit slow relaxation of magnetization with significantly different energy barriers.

scholarly journals Increasing the effective energy barrier promoted by the change of a counteranion in a Zn–Dy–Zn SMM: slow relaxation via the second excited state

2015 ◽  
Vol 51 (62) ◽  
pp. 12353-12356 ◽  
Author(s):  
I. Oyarzabal ◽  
J. Ruiz ◽  
E. Ruiz ◽  
D. Aravena ◽  
J. M. Seco ◽  
...  
Keyword(s):  
Excited State ◽  
Energy Barrier ◽  
Slow Relaxation ◽  
Effective Energy ◽  
Magnetization Relaxation

Slow magnetization relaxation via the second excited state with a Ueff = 186 cm−1 has been observed in a Zn–Dy–Zn complex.

scholarly journals Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 37588-37595
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Alexander V. Vasiliev ◽  
Reinhard K. Kremer ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Magnesium Silicate ◽  
Slow Relaxation ◽  
Magnetization Relaxation

The compound reveals dual magnetization relaxation with largely varying contributions from fast and slow relaxation paths controlled by field and temperature. The relaxation times retain values of a few seconds up to 40 K.

PHASE TRANSFORMATION AND SLOW RELAXATION IN FLUOSILICATES

1976 ◽  
Vol 37 (C6) ◽  
pp. C6-481-C6-481
Author(s):  
J. CHAPPERT ◽  
G. JEHANNO ◽  
F. VARRET
Keyword(s):  
Phase Transformation ◽  
Slow Relaxation

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

Slow Magnetization Relaxation in a 1-D Double-Chain Coordination Polymer Composed of {DyIII 4} Repeating Units

2013 ◽  
Vol 3 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Dimitris Alexandropoulos ◽  
Chaoran Li ◽  
Catherine Raptopoulou ◽  
Vassilis Psycharis ◽  
Wolfgang Wernsdorfer ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Double Chain ◽  
Magnetization Relaxation
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