Magnons and continua in a magnetized and dimerized spin - 12 chain

Stone, M. B.; Chen, Y.; Reich, D. H.; Broholm, C.; Xu, G.; Copley, J. R.  D.; Cook, J. C.

doi:10.1103/PhysRevB.90.094419

Title: Magnons and continua in a magnetized and dimerized spin - $\frac{1}{2}$ chain

Journal Article · Mon Sep 29 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.094419· OSTI ID:1159418

Stone, M. B. ^[1]; Chen, Y. ^[2]; Reich, D. H. ^[3]; Broholm, C. ^[4]; Xu, G. ^[5]; Copley, J. R. D. ^[6]; Cook, J. C. ^[6]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

We examine the magnetic field dependent excitations of the dimerized spin -1/2 chain, copper nitrate, with antiferromagnetic intra-dimer exchange $$J_1=0.44$$ (1) meV and exchange alternation $$\alpha=J_2/J_1=0.26$$ (2). Magnetic excitations in three distinct regimes of magnetization are probed through inelastic neutron scattering at low temperatures. At low and high fields there are three and two long-lived magnon-like modes, respectively. The number of modes and the anti-phase relationship between the wave-vector dependent energy and intensity of magnon scattering reflect the distinct ground states: A singlet ground state at low fields $$\mu_0H < \mu_0H_{c1} = 2.8$$ T and an $$S_z=1/2$$ product state at high fields $$\mu_0H > \mu_0H_{c2} = 4.2$$ T. Lastly, in the intermediate field regime, a continuum of scattering for $$\hbar\omega\approx J_1$$ is indicative of a strongly correlated gapless quantum state without coherent magnons.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-08ER46544; DMR-0454672; DMR-0944772; DEAC02-98CH10886

OSTI ID:: 1159418

Alternate ID(s):: OSTI ID: 1181025

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 9; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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