New magnetic frameworks of [(CuF2(H2O)2)x(pyz)]

Lanza, Arianna; Fiolka, Christoph; Fisch, Martin; Casati, Nicola; Skoulatos, M.; Rüegg, Christian; Krämer, Karl; Macchi, Piero

doi:10.1039/c4cc06696k

Cited by 19 publications

(21 citation statements)

References 14 publications

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“…The result obtained at P = 0 kbar agrees well with previous work [11,18,19]. Using our results for J and T N , we extract an empirical estimate [25] of the interlayer coupling J ⊥ ∼ 3 × 10 −4 meV.…”

Section: 6kbar 2dsupporting

confidence: 80%

“…14, 18 for the α-β structural phase transition, yet within the range of 5-15 kbar reported in Ref. 19. A possible reason for any absolute pressure variations across different studies can be due to the use of different methods of pressure generation and related inhomogeneities.…”

Section: 6kbar 2dmentioning

confidence: 97%

“…More generally, our work provides a reference example of how dramatic effects on the magnetic states in a 3D coordination material can be generated via modest perturbations [17,19,31,32]. Due to both the diverse range of metal organic materials with different ligands and networks that can be synthesized [33], and their generally higher compressibility compared with inorganic compounds, high-P becomes the effective tool for seeking novel quantum states in these materials.…”

Section: 6kbar 2dmentioning

confidence: 99%

“…Recently, CuF 2 (D 2 O) 2 pyz was reported to show a series of P -driven, first-order structural phase transitions [14,[17][18][19]. The ambient pressure phase, α- 2 pyz at ∼ 9 kbar, and γ-CuF 2 (D 2 O) 2 pyz at ∼ 32 kbar.…”

Section: 1kbar 1dmentioning

confidence: 99%

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Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2 (pyz): From spin-wave to spinon excitations

et al. 2017

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Metal organic magnets have enormous potential to host a variety of electronic and magnetic phases that originate from a strong interplay between the spin, orbital and lattice degrees of freedom. We control this interplay in the quantum magnet CuF2(D2O)2pyz by using high pressure to drive the system through a structural and magnetic phase transition. Using neutron scattering, we show that the low pressure state, which hosts a two-dimensional square lattice with spin-wave excitations and a dominant exchange coupling of 0.89 meV, transforms at high pressure into a one-dimensional spin-chain hallmarked by a spinon continuum and a reduced exchange interaction of 0.43 meV. This direct microscopic observation of a magnetic dimensional crossover as a function of pressure opens up new possibilities for studying the evolution of fractionalised excitations in low dimensional quantum magnets and eventually pressure-controlled metal-insulator transitions.PACS numbers: 64.70. Tg, 75.30.Kz, 75.40.Gb, 75.30.Ds, 75.10.Pq, 75.30.Et Interacting spin systems with strong quantum fluctuations are an indispensable platform for exploring concepts in quantum many-body theory. For rigorous tests of theory it is often necessary to measure the system response due to external control parameters such as applied magnetic field and pressure (P ). Just modest changes in these variables afford precise control over the strongly fluctuating degrees of freedom [1], and provide a direct route towards exotic physics such as magnetic field-and P -driven quantum phase transitions [2][3][4]. Another way to tune a system is to modify directly the magnetic superexchange, such as by changing the chemistry [5,6], or by generating a sizeable in-situ modification of the crystal lattice. While the latter case proves difficult to achieve, it is much sought-after since it promises the direct control of magnetic dimensionality. Moreover, such an in-situ dimensionality change can be independent of the temperature, with such crossovers usually taking place as density of thermal fluctuations varies.The different topologies of one-dimensional (1D) and two-dimensional (2D) quantum spin systems are wellknown to define strongly contrasting ground states and dynamics. In 1D systems such as the half-integer spin chain, fermionic fractional excitations termed unbound spinons give a characteristic excitation continuum that disperses only along the chain direction [7]. In contrast, on the 2D magnetic square lattice, Néel-order and spin waves dispersing within the square lattice plane can be expected [8]. Exploring an in-situ transformation between 1D and 2D magnetic regimes is experimentally challenging due to lack of suitable materials, but it can be expected to provide both a deeper understanding of the adjacent states, and potentially the discovery of unusual phenomena in the vicinity of the crossover. For example, in recent work on 2D magnetic square lattice systems such as Cu(DCOO) 2 ·4D 2 O and La 2 CuO 4 , unusual features in the excitation spectra of each have bee...

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Section: 6kbar 2dsupporting

confidence: 80%

Section: 6kbar 2dmentioning

confidence: 97%

Section: 6kbar 2dmentioning

confidence: 99%

Section: 1kbar 1dmentioning

confidence: 99%

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Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2 (pyz): From spin-wave to spinon excitations

et al. 2017

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“…Moreover, powder samples may be preferred when the phase evolution and transition points with increasing pressure are different for single crystals or powders, or in time-resolved investigations as experiments are faster (Boldyreva, 2007;Lanza et al, 2014;Fisch et al, 2015;Shekar & Rajan, 2001;Perillat, 2008;Evans et al, 2007;Velisavljevic et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The benefits of one-dimensional detectors for high-pressure powder X-ray diffraction

et al. 2015

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High-pressure powder X-ray diffraction is a fundamental technique for investigating structural responses to externally applied force. Synchrotron sources and two-dimensional detectors are required. In contrast to this conventional setup, high-resolution beamlines equipped with one-dimensional detectors could offer much better resolved peaks but cannot deliver accurate structure factors because they only sample a small portion of the Debye rings, which are usually inhomogeneous and spotty because of the small amount of sample. In this study, a simple method to overcome this problem is presented and successfully applied to solving the structure of an l-serine polymorph from powder data. A comparison of the obtained high-resolution high-pressure data with conventional data shows that this technique, providing up to ten times better angular resolution, can be of advantage for indexing, for lattice parameter refinement, and even for structure refinement and solution in special cases.

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A [Cu3] Cluster-Based Chain Featuring Linkages of Acylhydrazone N–N Single Bonds and Cl− Ions: Synthesis, Structure and Magnetic Properties

Guo

Shen

et al. 2018

J Clust Sci

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New magnetic frameworks of [(CuF₂(H₂O)₂)_x(pyz)]

Cited by 19 publications

References 14 publications

Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2 (pyz): From spin-wave to spinon excitations

Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2 (pyz): From spin-wave to spinon excitations

The benefits of one-dimensional detectors for high-pressure powder X-ray diffraction

A [Cu3] Cluster-Based Chain Featuring Linkages of Acylhydrazone N–N Single Bonds and Cl− Ions: Synthesis, Structure and Magnetic Properties

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