Single crystal magnetic susceptibility measurements on the linear chain polymer copper (II) pyrazine nitrate

Losee, D. Bruce; Richardson, H. Wayne; Hatfield, William E.

doi:10.1063/1.1680524

Cited by 64 publications

(22 citation statements)

References 9 publications

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“…Except near H s , where the effect of thermal excitations is significant, experiment and theory are in excellent agreement. The parameters used for the fit, J = 10.8 K and g = 2.3, agree well with previously reported values [6,15], and H s is determined to be 13.97 T (see Fig. 1(b)).…”

Section: Field Variation Of the Magnetization And Magnetic Susceptibisupporting

confidence: 78%

Magnetization Study of the Quantum Critical Behavior of the One Dimensional Spin-1/2 Heisenberg Antiferromagnet CuPzN

Kono

Sakakibara²,

Aoyama³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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High-precision DC magnetization (M) measurements have been performed on a single crystal of copper pyrazine dinitrate (CuPzN) in magnetic fields H up to 14.7 T at temperatures down to 0.08 K. This material is one of the best realizations of a one-dimensional (1D) S = 1/2 Heisenberg antiferromagnet. At the base temperature, full saturation of M is observed above H s = 13.97 T with the M(H) curve closely following a prediction based on the Bethe ansatz. The peak in M(T ), which appears at about 7 K in zero field, moves to lower temperatures with increasing H and vanishes into a temperature region well below 0.08 K at H ∼ H s ; as a result, M(T ) exhibits a strong upturn as T → 0 at this field, in agreement with a theoretical prediction. These results constitute an observation of field-induced quantum critical behavior in bulk magnetization.

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Section: Field Variation Of the Magnetization And Magnetic Susceptibisupporting

confidence: 78%

Magnetization Study of the Quantum Critical Behavior of the One Dimensional Spin-1/2 Heisenberg Antiferromagnet CuPzN

Kono

Sakakibara²,

Aoyama³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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“…Cu(pyz)(NO 3 ) 2 has been chosen because it provides a good experimental realisation of the S = 1/2 1D antiferromagnetic Heisenberg model [14,15]. As a result, its magnetic [11,[14][15][16][17][18], spin-dynamic [19][20][21][22][23][24], thermal [25,26], and vibrational [27,28] properties have been the subject of experimental and theoretical investigation. Cu(pyz)(NO 3 ) 2 in a coordination polymer consisting of a crystalline arrangement of chains of Cu 2+ ions linked by pyrazine (pyz) ligands parallel to the a axis of its unit cell, where each Cu 2+ ion is also bonded to a pair of nitrate ions, illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Exchange constants in molecule-based magnets derived from density functional methods

2017

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Cu(pyz)(NO3)2 is a quasi one-dimensional molecular antiferromagnet that exhibits three dimensional long-range magnetic order below TN = 110 mK due to the presence of weak inter-chain exchange couplings. Here we compare calculations of the three largest exchange coupling constants in this system using two techniques based on plane-wave basis-set density functional theory: (i) a dimer fragment approach and (ii) an approach using periodic boundary conditions. The calculated values of the large intrachain coupling constant are found to be consistent with experiment, showing the expected level of variation between different techniques and implementations. However, the interchain coupling constants are found to be smaller than the current limits on the resolution of the calculations. This is due to the computational limitations on convergence of absolute energy differences with respect to basis set, which are larger than the inter-chain couplings themselves. Our results imply that errors resulting from such limitations are inherent in the evaluation of small exchange constants in systems of this sort, and that many previously reported results should therefore be treated with caution.

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“…stant J/k B = 10.7 K which allows experimental access to the parameter range of the saturation field B c ∼ 14.9 T and above [24]. The unit cell is orthorhombic, at room temperature the lattice constants are a = 6.712Å, b = 5.142Å, and c = 11.732Å [25], see Fig.…”

Section: Methodsmentioning

confidence: 99%

Quantum critical dynamics of anS=12antiferromagnetic Heisenberg chain studied byC

et al. 2009

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We present a 13 C-NMR study of the magnetic field driven transition to complete polarization of the S=1/2 antiferromagnetic Heisenberg chain system copper pyrazine dinitrate Cu(C4H4N2)(NO3)2 (CuPzN). The static local magnetization as well as the low-frequency spin dynamics, probed via the nuclear spin-lattice relaxation rate T −1 1 , were explored from the low to the high field limit and at temperatures from the quantum regime (kBT ≪ J) up to the classical regime (kBT ≫ J). The experimental data show very good agreement with quantum Monte Carlo calculations over the complete range of parameters investigated. Close to the critical field, as derived from static experiments, a pronounced maximum in T −1 1 is found which we interpret as the finite-temperature manifestation of a diverging density of zero-energy magnetic excitations at the field-driven quantum critical point.

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Single crystal magnetic susceptibility measurements on the linear chain polymer copper (II) pyrazine nitrate

Cited by 64 publications

References 9 publications

Magnetization Study of the Quantum Critical Behavior of the One Dimensional Spin-1/2 Heisenberg Antiferromagnet CuPzN

Magnetization Study of the Quantum Critical Behavior of the One Dimensional Spin-1/2 Heisenberg Antiferromagnet CuPzN

Exchange constants in molecule-based magnets derived from density functional methods

Quantum critical dynamics of anS=12antiferromagnetic Heisenberg chain studied byC

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