Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Wang, Jianli; Caron, L. G.; Campbell, S. J.; Kennedy, S.J.; Hofmann, M.; Cheng, Zhenxiang; Din, Muhamad Faiz Md; Studer, Andrew J.; Brück, E.; Dou, Shi Xue

doi:10.1103/physrevlett.110.217211

Cited by 50 publications

(20 citation statements)

References 24 publications

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“…This means that the new hydrogen bond pathway must be the driving mechanism of the magnetic crossover. Since the 0.8 GPa magnetic crossover is driven by these local lattice distortions, the transition should be considered magnetoelastic rather than purely magnetic414243. Moreover, the crossover is an excellent illustration of how pressure-induced changes in bond lengths and angles modify the transfer integral t which in turn modifies the exchange interaction J 1233.…”

Section: Resultsmentioning

confidence: 99%

Pressure-Induced Magnetic Crossover Driven by Hydrogen Bonding in CuF2(H2O)2(3-chloropyridine)

O’Neal

Brinzari

Wright

et al. 2014

Sci Rep

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Hydrogen bonding plays a foundational role in the life, earth, and chemical sciences, with its richness and strength depending on the situation. In molecular materials, these interactions determine assembly mechanisms, control superconductivity, and even permit magnetic exchange. In spite of its long-standing importance, exquisite control of hydrogen bonding in molecule-based magnets has only been realized in limited form and remains as one of the major challenges. Here, we report the discovery that pressure can tune the dimensionality of hydrogen bonding networks in CuF2(H2O)2(3-chloropyridine) to induce magnetic switching. Specifically, we reveal how the development of exchange pathways under compression combined with an enhanced ab-plane hydrogen bonding network yields a three dimensional superexchange web between copper centers that triggers a reversible magnetic crossover. Similar pressure- and strain-driven crossover mechanisms involving coordinated motion of hydrogen bond networks may play out in other quantum magnets.

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Section: Resultsmentioning

confidence: 99%

Pressure-Induced Magnetic Crossover Driven by Hydrogen Bonding in CuF2(H2O)2(3-chloropyridine)

O’Neal

Brinzari

Wright

et al. 2014

Sci Rep

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“…The stable intermetallic compounds in the RE-MnGe (Si, Sn, In) systems show complex magnetic properties, mainly resulting from complex exchange interactions between 4f-moments of the rare-earth metals and the itinerant 3d moments of Mn [7][8][9]. In particular, the ternary compounds (e.g., RMn 2 X 2 with ThCr 2 Si 2 -typed structure and REMnX compounds with CeFeSi or TiNiSi-typed structure) in the Nd-Mn-Ge/Si ternary systems were discovered to show interesting magnetic properties including magnetocaloric effect, gaint magnetoresistance effect and magnetic-field-induced strain [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and thermodynamic re-assessment of the Mn–Nd binary system

Rong

Wang

et al. 2016

J Therm Anal Calorim

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Fourteen Mn-Nd alloys were investigated experimentally by means of thermal analysis. The temperatures of the invariant reactions and liquidus in the Mn-Nd binary system were determined. Based on the experimental results obtained in the present work as well as the experimental data reported and the previous assessments in the literature, the Mn-Nd binary system was re-assessed thermodynamically using the CALPHAD method. The solution phases, including liquid, a-Mn, b-Mn, c-Mn, d-Mn, a-Nd and d-Nd, are modeled by the substitutional solution model, and their excess Gibbs energies are expressed with the Redlich-Kister polynomial. The intermetallic compounds, Mn 2 Nd, Mn 23 Nd 6 and Mn 17 Nd 2 , are treated as stoichiometric compounds. A set of self-consistent thermodynamic parameters obtained finally to describe the Gibbs energies of various phases in the Mn-Nd binary system can be used to reproduce well the reported phase equilibria and thermodynamic data.

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“…For example, the magnetic entropy values of RNi 2 Si 2 (R = Dy, Ho, Er) compounds are 21.3 J kg −1 K −1 , 21.7 J kg −1 K −1 and 22.9 J kg −1 K −1 around 6.5 K, 4.5 K and 3.5 K respectively during a change of magnetic induction intensity from 0–5 T16, while the magnetic entropy of ErCr 2 Si 2 attained 29.7 J kg −1 K −1 near the magnetic ordering temperature 4.5 K17. The crystal structure of the RT 2 X 2 series is body centred tetragonal ThCr 2 Si 2 -type (with space group I4/mmm)151819, with the sequence -R-X-T-X-R- atomic layers stacked along the c-axis. The rare earth elements typically exhibit large magnetic moment (for example μ Tb = 8.8 μ B in TbMn 2 Si 2 at 5 K)20 and correspondingly make a large contribution to the magnetocaloric effect141517.…”

mentioning

confidence: 95%

“…Some RT 2 X 2 compounds (R = rare earth, T = transition metal, and X = Si or Ge) have been found to exhibit large MCE values with small hysteresis losses near their low magnetic transition temperatures1113141516. For example, the magnetic entropy values of RNi 2 Si 2 (R = Dy, Ho, Er) compounds are 21.3 J kg −1 K −1 , 21.7 J kg −1 K −1 and 22.9 J kg −1 K −1 around 6.5 K, 4.5 K and 3.5 K respectively during a change of magnetic induction intensity from 0–5 T16, while the magnetic entropy of ErCr 2 Si 2 attained 29.7 J kg −1 K −1 near the magnetic ordering temperature 4.5 K17.…”

mentioning

confidence: 99%

New insight into magneto-structural phase transitions in layered TbMn2Ge2-based compounds

Fang

Wang

et al. 2017

Sci Rep

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The Tb1−xYxMn2Ge2 series (x = 0, 0.1, 0.2) compounds are found to exhibit two magnetic phase transitions with decreasing temperature: from the paramagnetic state to the antiferromagnetic interlayer state at TNinter and from an antiferromagnetic interlayer structure to a collinear ferrimagnetic interlayer structure at TCinter. Compared with the slight change of TNinter (409 K, 410 K and 417 K for x = 0, 0.1 and 0.2 respectively), the replacement of Y for Tb leads to a significant decrease in TCinter from 97.5 K for x = 0 to 74.6 K for x = 0.2. The variation in TCinter can be ascribed to the combination of two effects: (1) chemical pressure and (2) magnetic dilution effect by Y substitution for Tb. Besides, a strong anisotropic magnet-volume effect has been detected around TCinter in all compounds with Δa/a = 0.125%, 0.124% and 0.130% for x = 0, 0.1 and 0.2, respectively while no obvious effect is detected along the c-axis. The maximum magnetic entropy change were found to be −ΔSmax = 9.1 J kg−1 K−1, 11.9 J kg−1 K−1 and 6.3 J kg−1 K−1 with a field change from 0 T to 5 T for x = 0, 0.1, 0.2 respectively.

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Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Cited by 50 publications

References 24 publications

Pressure-Induced Magnetic Crossover Driven by Hydrogen Bonding in CuF2(H2O)2(3-chloropyridine)

Pressure-Induced Magnetic Crossover Driven by Hydrogen Bonding in CuF2(H2O)2(3-chloropyridine)

Experimental investigation and thermodynamic re-assessment of the Mn–Nd binary system

New insight into magneto-structural phase transitions in layered TbMn2Ge2-based compounds

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