Spin dynamics and exchange interactions in CuO measured by neutron scattering

被引:13
|
作者
Jacobsen, H. [1 ]
Gaw, S. M. [1 ]
Princep, A. J. [1 ]
Hamilton, E. [1 ]
Toth, S. [2 ]
Ewings, R. A. [3 ]
Enderle, M. [4 ]
Wheeler, E. M. Hetroy [4 ]
Prabhakaran, D. [1 ]
Boothroyd, A. T. [1 ]
机构
[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[2] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland
[3] STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, Oxon, England
[4] Inst Laue Langevin, 71 Ave Martyrs,CS 20156, F-38042 Grenoble 9, France
基金
英国工程与自然科学研究理事会;
关键词
ANTIFERROMAGNETIC LINEAR-CHAIN; CUPRIC OXIDE; POLARIZATION ANALYSIS; MAGNETIC EXCITATIONS; CRYSTAL-STRUCTURE; CHARGE STRIPES; GROUND-STATE; DISORDER; FIELD; SUPERCONDUCTIVITY;
D O I
10.1103/PhysRevB.97.144401
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The magnetic properties of CuO encompass several contemporary themes in condensed-matter physics, including quantum magnetism, magnetic frustration, magnetically-induced ferroelectricity, and orbital currents. Here we report polarized and unpolarized neutron inelastic scattering measurements which provide a comprehensive map of the cooperative spin dynamics in the low-temperature antiferromagnetic (AFM) phase of CuO throughout much of the Brillouin zone. At high energies (E greater than or similar to 100 meV), the spectrum displays continuum features consistent with the des Cloizeax-Pearson dispersion for an ideal S = 1/2 Heisenberg AFM chain. At lower energies, the spectrum becomes more three dimensional, and we find that a linear spin-wave model for a Heisenberg AFM provides a very good description of the data, allowing for an accurate determination of the relevant exchange constants in an effective spin Hamiltonian for CuO. In the high-temperature helicoidal phase, there are features in the measured low-energy spectrum that we could not reproduce with a spin-only model. We discuss how these might be associated with the magnetically-induced multiferroic behavior observed in this phase.
引用
收藏
页数:14
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