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  Field-induced staggered moment stabilization in frustrated quantum magnets

Schmidt, B., Siahatgar, M., & Thalmeier, P. (2013). Field-induced staggered moment stabilization in frustrated quantum magnets. Journal of the Korean Physical Society, 62(10), 1499-1503. doi:10.3938/jkps.62.1499.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EBA-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EBB-D
Genre: Journal Article

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 Creators:
Schmidt, B.1, Author              
Siahatgar, M.2, Author              
Thalmeier, P.3, Author              
Affiliations:
1Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863464              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: For low-dimensional frustrated quantum magnets, the dependence of the staggered moment on a magnetic field is nonmonotonic: For small and intermediate fields, quantum fluctuations are gradually suppressed, leading to an increase of the staggered moment as a function of the field strength. For large applied magnetic fields, the classically expected field dependence is recovered, namely a monotonous decrease with increasing field strength. The staggered moment is eventually suppressed when reaching the fully polarized state at the saturation field. The quantitative analysis of this behavior is an excellent tool to determine the frustration parameter of a magnetic compound. We have developed a general finite-size scaling scheme for numerical exact-diagonalization data of low-dimensional frustrated magnets, which we apply to the recently measured field dependence of the magnetic neutron scattering intensity of Cu(pz)(2)(ClO4)(2) in the framework of the S = 1/2 two-dimensional (2D) J (1)-J (2) Heisenberg model. We also apply linear spin-wave theory to complement our numerical findings. Our results show that Cu(pz)(2)(ClO4)(2) is a quasi-2D antiferromagnet with intermediate frustration J (2)/J (1) = 0.2.

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Language(s): eng - English
 Dates: 2013-05-28
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 668952
ISI: 000320122700030
DOI: 10.3938/jkps.62.1499
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Title: Journal of the Korean Physical Society
Source Genre: Journal
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Pages: - Volume / Issue: 62 (10) Sequence Number: - Start / End Page: 1499 - 1503 Identifier: ISSN: 0374-4884