Pressure Dependence of the Magnetization of M<sup>II</sup> (N(CN)<sub>2</sub>)2: Mechanism for the Long Range Magnetic Ordering

Nuttall, Christopher J.; Takenobu, Taishi; Iwasa, Yoshihiro; Kurmoo, Mohamedally

doi:10.1080/10587250008023531

Cited by 20 publications

(37 citation statements)

References 13 publications

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“…37 The pressure-dependent magnetic behaviour can become more complex in systems for which the magnetic exchange arises from a contribution of both FM and AFM interactions. 29,38 In these cases, FM compounds have a greater tendency for their T C to remain unchanged or decrease with pressure, while the AFM compounds generally exhibit an increase of T N with pressure. 12,35,38 This observation can be understood by the response of AFM interactions to both M-L-M binding angle and the M-L bond distances, whilst FM interactions are most sensitive to the M-L-M binding angle.…”

Section: Introductionmentioning

confidence: 99%

“…29,38 In these cases, FM compounds have a greater tendency for their T C to remain unchanged or decrease with pressure, while the AFM compounds generally exhibit an increase of T N with pressure. 12,35,38 This observation can be understood by the response of AFM interactions to both M-L-M binding angle and the M-L bond distances, whilst FM interactions are most sensitive to the M-L-M binding angle. 35 Ammonium metal formates, as well as related metal formates ([A][M(HCOO) 3 ]) with protonated amine-templating cations on the A-site, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Collings

Manna

Tsirlin

et al. 2018

Phys. Chem. Chem. Phys.

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High-pressure single-crystal X-ray diffraction at ambient temperature and high-pressure SQUID measurements down to 2 K were performed up to ∼2.5 GPa on ammonium metal formates, [NH][M(HCOO)] where M = Mn, Fe, and Ni, in order to correlate structural variations to magnetic behaviour. Similar structural distortions and phase transitions were observed for all compounds, although the transition pressures varied with the size of the metal cation. The antiferromagnetic ordering in [NH][M(HCOO)] compounds was maintained as a function of pressure, and the magnetic ordering transition temperature changed within a few kelvins depending on the structural distortion and the metal cation involved. These compounds, in particular [NH][Fe(HCOO)], showed greatest sensitivity to the degree of spin canting upon compression, clearly visible from the twenty-fold increase in the low-temperature magnetisation for [NH][Fe(HCOO)] at 1.4 GPa, and the change from purely antiferromagnetic to weakly ferromagnetic ordering in [NH][Mn(HCOO)] at 1 GPa. The variation in the exchange couplings and spin canting was checked with density-functional calculations that reproduce well the increase in canted moment within [NH][Fe(HCOO)] upon compression, and suggest that the Dzyaloshinskii-Moriya (DM) interaction is evolving as a function of pressure. The pressure dependence of spin canting is found to be highly dependent on the metal cation, as magnetisation magnitudes did not change significantly for when M = Ni or Mn. These results demonstrate that the overall magnetic behaviour of each phase upon compression was not only dependent on the structural distortions but also on the electronic configuration of the metal cation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Collings

Manna

Tsirlin

et al. 2018

Phys. Chem. Chem. Phys.

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“…The Fe(N(CN) 2 ) 2 and Ni(N(CN) 2 ) 2 compounds show an increase of the transition temperature of 26% and 6%, respectively, for pressures as large as 17 kbar, whereas the Co(N(CN) 2 ) 2 undergoes a transition from ferromagnetic to antiferromagnetic interactions at nominally 13 kbar. 11 Herein, low and high field dc and ac magnetization studies for Mn(N(CN) 2 ) 2 are reported as a function of pressure up to 12.1 kbar. The data indicate an increase in the strength of the superexchange interaction with pressure and the appearance of a large magnetic anisotropy above 8.6 kbar.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced enhancement of the magnetic anisotropy inMn(N(CN)2)2

et al. 2015

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Using dc and ac magnetometry, the pressure dependence of the magnetization of the threedimensional antiferromagnetic coordination polymer Mn(N(CN)2)2 was studied up to 12 kbar and down to 8 K. The antiferromagnetic transition temperature, TN, increases dramatically with applied pressure (P ), where a change from TN(P = ambient) = 16.0 K to TN(P = 12.1 kbar) = 23.5 K was observed. In addition, a marked difference in the magnetic behavior is observed above and below 7.1 kbar. Specifically, for P < 7.1 kbar, the differences between the field-cooled and zero-field-cooled (fc-zfc) magnetizations, the coercive field, and the remanent magnetization decrease with increasing pressure. However, for P > 7.1 kbar, the behavior is inverted. Additionally, for P > 8.6 kbar, minor hysteresis loops are observed. All of these effects are evidence of the increase of the superexchange interaction and the appearance of an enhanced exchange anisotropy with applied pressure.

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“…[24][25][26][27][28][29][30][31][32][33] Mn[N(CN) 2 ] 2 is a particularly important member of this series. [34][35][36][37][38] In the Pnnm structure, the Mn(II) centers are connected by soft N≡C-N ligands that act as magnetic superexchange pathways.…”

Section: Introductionmentioning

confidence: 99%

Competing magnetostructural phases in a semiclassical system

et al. 2017

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The interplay between charge, structure, and magnetism gives rise to rich phase diagrams in complex materials with exotic properties emerging when phases compete. Molecule-based materials are particularly advantageous in this regard due to their low energy scales, flexible lattices, and chemical tunability. Here, we bring together high pressure Raman scattering, modeling, and first principles calculations to reveal the pressure-temperature-magnetic field phase diagram of Mn[N(CN) 2 ] 2 . We uncover how hidden soft modes involving octahedral rotations drive two pressure-induced transitions triggering the low → high magnetic anisotropy crossover and a unique reorientation of exchange planes. These magnetostructural transitions and their mechanisms highlight the importance of spin-lattice interactions in establishing phases with novel magnetic properties in Mn(II)-containing systems.npj Quantum Materials (2017) 2:65 ; doi:10.1038/s41535-017-0065-0 INTRODUCTIONThe interplay between charge, structure, and magnetism has a profound effect on the functionality of complex materials.

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Pressure Dependence of the Magnetization of M^II (N(CN)₂)2: Mechanism for the Long Range Magnetic Ordering

Cited by 20 publications

References 13 publications

Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Pressure-induced enhancement of the magnetic anisotropy inMn(N(CN)2)2

Competing magnetostructural phases in a semiclassical system

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Pressure Dependence of the Magnetization of MII (N(CN)2)2: Mechanism for the Long Range Magnetic Ordering

Cited by 20 publications

References 13 publications

Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Pressure dependence of spin canting in ammonium metal formate antiferromagnets

Pressure-induced enhancement of the magnetic anisotropy inMn(N(CN)2)2

Competing magnetostructural phases in a semiclassical system

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Pressure Dependence of the Magnetization of M^II (N(CN)₂)2: Mechanism for the Long Range Magnetic Ordering