Competing magnetostructural phases in a semiclassical system

O’Neal, Kenneth; Lee, Jun Hee; Kim, Maengsuk; Manson, Jamie L.; Liu, Zhenxian; Fishman, Randy; Musfeldt, J. L.

doi:10.1038/s41535-017-0065-0

Cited by 6 publications

(7 citation statements)

References 66 publications

(79 reference statements)

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“…In the case of transition metal fluorides, this novel chemistry might lead to species featuring exotic magnetic ions, such as Au 4+ (5d 7 electronic configuration) or Au 2+ (5d 9 ). This provides a link between the high‐pressure chemistry of M/F 2 systems (M—transition metal) and investigations concerned with the influence of compression on the magnetic properties of materials [15–17] …”

Section: Introductionmentioning

confidence: 98%

“…This provides a link between the high-pressure chemistry of M/F2 systems (M -transition metal) and investigations concerned with the influence of compression on the magnetic properties of materials. [15][16][17] In this context, the study of the Ag/F2 system under large compression is of particular interest. Recent calculations predict that AgF4, containing the Ag 4+ cation (4d 7 electronic configuration), should become thermodynamically stable at high pressures.…”

Section: Introductionmentioning

confidence: 99%

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Fluorides of Silver Under Large Compression**

Kurzydłowski

Derzsi

Zurek

et al. 2021

Chemistry A European J

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The silver-fluorinep hase diagramh as been scrutinized as af unctiono fe xternal pressure using theoretical methods. Our results indicatet hat two novel stoichiometries containing Ag + and Ag 2 + cations (Ag 3 F 4 and Ag 2 F 3)a re thermodynamically stable at ambient andl ow pressure. Both are computedt ob em agnetic semiconductors under ambient pressure conditions. For Ag 2 F 5 ,c ontaining both Ag 2 + and Ag 3 + ,w efind that strong 1D antiferromagnetic coupling is retained throughout the pressure-induced phase transition sequence up to 65 GPa. Our calculationss howt hat throughout the entire pressure range of their stability the mixed-valence fluorides preserve af inite band gap at the Fermi level. We also confirm the possibility of synthesizingA gF 4 as ap aramagnetic compound ath igh pressure. Our results indicate that this compound is metallic in its thermodynamic stability region. Finally,w ep resentg eneral considerations on the thermodynamic stabilityo fm ixed-valence compounds of silver at high pressure.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Fluorides of Silver Under Large Compression**

Kurzydłowski

Derzsi

Zurek

et al. 2021

Chemistry A European J

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“…At the same time, susceptibility measurements demonstrate that T N increases under pressure [Figure ]. This trend is observed in a number of other molecule-based magnets including Mn[N(CN) 2 ] 2 , FeCp*[TCNE], and Cu(pyz)(NO 3 ) 2 . − Inclusion of these data in the pressure–temperature portion of the phase diagram completes the picture. In addition to the dramatic broadening of the two phase region, the low-pressure boundary of the structural transition may be triggering the magnetic transition.…”

Section: Resultsmentioning

confidence: 75%

“…In addition to the dramatic broadening of the two phase region, the low-pressure boundary of the structural transition may be triggering the magnetic transition. Similar triggering processes are active in Mn[N(CN) 2 ] 2 . Both materials exhibit a series of pressure-induced structural transitions that likely impact the low-temperature magnetism.…”

Section: Resultsmentioning

confidence: 82%

“…Similar triggering processes are active in Mn[N(CN) 2 ] 2 . 50 Both materials exhibit a series of pressure-induced structural transitions that likely impact the low-temperature magnetism. What makes this work unique is that the high-pressure phase of [(CH 3 ) 2 NH 2 ]Mn(HCOO) 3 is polar and can have interesting application potential if the polarization is switchable.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Developing the Pressure–Temperature–Magnetic Field Phase Diagram of Multiferroic [(CH₃)₂NH₂]Mn(HCOO)₃

et al. 2020

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We combined Raman scattering and magnetic susceptibility to explore the properties of [(CH 3 ) 2 NH 2 ]Mn-(HCOO) 3 under compression. Analysis of the formate bending mode reveals a broad two-phase region surrounding the 4.2 GPa critical pressure that becomes increasingly sluggish below the order−disorder transition due to the extensive hydrogen-bonding network. Although the paraelectric and ferroelectric phases have different space groups at ambient-pressure conditions, they both drive toward P1 symmetry under compression. This is a direct consequence of how the order−disorder transition changes under pressure. We bring these findings together with prior magnetization work to create a pressure−temperature−magnetic field phase diagram, unveiling entanglement, competition, and a progression of symmetry-breaking effects that underlie functionality in this molecule-based multiferroic. That the high-pressure P1 phase is a subgroup of the ferroelectric Cc suggests the possibility of enhanced electric polarization as well as opportunity for strain control.

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Spin–Lattice Coupling Across the Magnetic Quantum-Phase Transition in Copper-Containing Coordination Polymers

et al. 2020

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We measured the infrared vibrational properties of two copper-containing coordination polymers, [Cu(pyz)2(2-HOpy)2](PF6)2 and [Cu(pyz)1.5(4-HOpy)2](ClO4)2, under different external stimuli in order to explore the microscopic aspects of spin–lattice coupling. While the temperature and pressure control hydrogen bonding, an applied field drives these materials from the antiferromagnetic → fully saturated state. Analysis of the pyrazine (pyz)-related vibrational modes across the magnetic quantum-phase transition provides a superb local probe of magnetoelastic coupling because the pyz ligand functions as the primary exchange pathway and is present in both systems. Strikingly, the PF6 – compound employs several pyz-related distortions in support of the magnetically driven transition, whereas the ClO4 – system requires only a single out-of-plane pyz bending mode. Bringing these findings together with magnetoinfrared spectra from other copper complexes reveals spin–lattice coupling across the magnetic quantum-phase transition as a function of the structural and magnetic dimensionality. Coupling is maximized in [Cu(pyz)1.5(4-HOpy)2](ClO4)2 because of its ladderlike character. Although spin–lattice interactions can also be explored under compression, differences in the local structure and dimensionality drive these materials to unique high-pressure phases. Symmetry analysis suggests that the high-pressure phase of the ClO4 – compound may be ferroelectric.

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Competing magnetostructural phases in a semiclassical system

Cited by 6 publications

References 66 publications

Fluorides of Silver Under Large Compression**

Fluorides of Silver Under Large Compression**

Developing the Pressure–Temperature–Magnetic Field Phase Diagram of Multiferroic [(CH₃)₂NH₂]Mn(HCOO)₃

Spin–Lattice Coupling Across the Magnetic Quantum-Phase Transition in Copper-Containing Coordination Polymers

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Competing magnetostructural phases in a semiclassical system

Cited by 6 publications

References 66 publications

Fluorides of Silver Under Large Compression**

Fluorides of Silver Under Large Compression**

Developing the Pressure–Temperature–Magnetic Field Phase Diagram of Multiferroic [(CH3)2NH2]Mn(HCOO)3

Spin–Lattice Coupling Across the Magnetic Quantum-Phase Transition in Copper-Containing Coordination Polymers

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Developing the Pressure–Temperature–Magnetic Field Phase Diagram of Multiferroic [(CH₃)₂NH₂]Mn(HCOO)₃