A novel Cu5II cluster-based 3D magnetic framework with an overall S= 1/2 spin ground state

Liu, Zhongyi; Chu, Jing; Ding, Bo; Zhao, Xiao‐Jun; Yang, En‐Cui

doi:10.1016/j.inoche.2011.03.033

Cited by 13 publications

(8 citation statements)

References 37 publications

(12 reference statements)

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“…This weight loss is in good agreement with the preceding thermogravimetric data of Ref. 22 that reported the weight loss of 13.6 % at 380 − 400 K. Although the decomposition process is tentatively ascribed to the release of water molecules (expected weight loss of 13.15 %) 22 , no detailed information on the decomposed sample is available in the literature.…”

Section: Magnetizationsupporting

confidence: 91%

“…where ρ m = 2043 kg/m 3 is the mass density, 22 v is the sound velocity in Cu 5 -NIPA (typical value c ∼ 1500 m/sec in nanomagnets 68 ), and λ stands for the spinphonon coupling energy parameter, which is related e.g. to the fluctuating portion of the Dzyalozinskii-Moriya interactions present in this system.…”

Section: Nuclear Spin-lattice Relaxation Rate 1/t1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…20 Another attractive feature of Cu 5 -NIPA is the presence of two corner-sharing scalene triangles, related by inversion symmetry. 21,22 The spin triangle is the most elementary unit for highly frustrated magnetism, 23 while its chirality may induce a finite magnetoelectric coupling, 24,25 and may also be used as a qubit. 26 In molecular magnetism, the spin triangle is common in many compounds, 1 such as V 15 , 12,27 Cu 3 clusters, 28 the chiral Dy 3 cluster, 29 the cuboctahedron Cu 12 La 8 , 30 as well as the giant icosidodecahedral keplerates Mo 72 Fe 30 , 31 W 72 Fe 30 , 32 Mo 72 Cr 30 , 33 Mo 72 V 30 34 and W 72 V 30 , 35 which host highly frustrating kagome-like physics.…”

Section: Introductionmentioning

confidence: 99%

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Magnetization and spin dynamics of the spinS=12hourglass nanomagnet Cu5(OH)

et al. 2013

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We report a combined experimental and theoretical study of the spin S = 1 2 nanomagnet Cu5(OH)2(NIPA)4•10H2O (Cu5-NIPA). Using thermodynamic, electron spin resonance and 1 H nuclear magnetic resonance measurements on one hand, and ab initio density-functional band-structure calculations, exact diagonalizations and a strong coupling theory on the other, we derive a microscopic magnetic model of Cu5-NIPA and characterize the spin dynamics of this system. The elementary five-fold Cu 2+ unit features an hourglass structure of two corner-sharing scalene triangles related by inversion symmetry. Our microscopic Heisenberg model comprises one ferromagnetic and two antiferromagnetic exchange couplings in each triangle, stabilizing a single spin S = 1 2 doublet ground state (GS), with an exactly vanishing zero-field splitting (by Kramer's theorem), and a very large excitation gap of ∆ 68 K. Thus, Cu5-NIPA is a good candidate for achieving long electronic spin relaxation (T1) and coherence (T2) times at low temperatures, in analogy to other nanomagnets with low-spin GS's. Of particular interest is the strongly inhomogeneous distribution of the GS magnetic moment over the five Cu 2+ spins. This is a purely quantum-mechanical effect since, despite the non-frustrated nature of the magnetic couplings, the GS is far from the classical collinear ferrimagnetic configuration. Finally, Cu5-NIPA is a rare example of a S = 1 2 nanomagnet showing an enhancement in the nuclear spin-lattice relaxation rate 1/T1 at intermediate temperatures.

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Section: Magnetizationsupporting

confidence: 91%

Section: Nuclear Spin-lattice Relaxation Rate 1/t1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetization and spin dynamics of the spinS=12hourglass nanomagnet Cu5(OH)

et al. 2013

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“…Some of the magnetic properties of Cu5-NIPA were investigated as well as a theoretical model was constructed by Nath et al [71]. Let us mention that somewhat similar, pentamer-based structures assembled of spin-1/2 copper ions are also reported [72][73][74][75], but they exhibit different magnetic interactions and geometry than Cu5-NIPA. The aim of our work was to characterize theoretically the magnetocaloric properties of the Cu5-NIPA nanomagnet.…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

Szałowski

Kowalewska

2020

Materials

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We calculated the magnetocaloric properties of the molecular nanomagnet Cu5-NIPA, consisting of five spins S = 1 / 2 arranged in two corner-sharing triangles (hourglass-like structure without magnetic frustration). The thermodynamics of the system in question was described using the quantum Heisenberg model solved within the field ensemble (canonical ensemble) using exact numerical diagonalization. The dependence of the magnetic entropy and magnetic specific heat on the temperature and the external magnetic field was investigated. The isothermal entropy change for a wide range of initial and final magnetic fields was discussed. Due to plateau-like behavior of the isothermal entropy change as a function of the temperature, a high degree of tunability of magnetocaloric effect with the initial and final magnetic field was demonstrated.

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