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

Abstract

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.

Authors:

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)

Publication Date:: Mon Sep 29 00:00:00 EDT 2014

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

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

OSTI Identifier:: 1159418

Alternate Identifier(s):: OSTI ID: 1181025

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

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 90; Journal Issue: 9; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Stone, M. B., Chen, Y., Reich, D. H., Broholm, C., Xu, G., Copley, J. R.  D., and Cook, J. C. Magnons and continua in a magnetized and dimerized spin - 12 chain.  United States: N. p., 2014. 
Web.  doi:10.1103/PhysRevB.90.094419.

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                    Stone, M. B., Chen, Y., Reich, D. H., Broholm, C., Xu, G., Copley, J. R.  D., & Cook, J. C. Magnons and continua in a magnetized and dimerized spin - 12 chain.  United States.  https://doi.org/10.1103/PhysRevB.90.094419

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                    Stone, M. B., Chen, Y., Reich, D. H., Broholm, C., Xu, G., Copley, J. R.  D., and Cook, J. C. Mon .  
"Magnons and continua in a magnetized and dimerized spin - 12 chain".  United States.  https://doi.org/10.1103/PhysRevB.90.094419.  https://www.osti.gov/servlets/purl/1159418.

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@article{osti_1159418,

  title        = {Magnons and continua in a magnetized and dimerized spin - 12 chain},

  author       = {Stone, M. B. and Chen, Y. and Reich, D. H. and Broholm, C. and Xu, G. and Copley, J. R.  D. and Cook, J. C.},

  abstractNote = {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.},

  doi          = {10.1103/PhysRevB.90.094419},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 9,

  volume       = 90,

  place        = {United States},

  year         = {Mon Sep 29 00:00:00 EDT 2014},

  month        = {Mon Sep 29 00:00:00 EDT 2014}

}

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journal, June 2016

Vanderstraeten, Laurens; Haegeman, Jutho; Verstraete, Frank
Physical Review B, Vol. 93, Issue 23
DOI: 10.1103/physrevb.93.235108

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Title: Magnons and continua in a magnetized and dimerized spin - 1 2 chain

Abstract

Citation Formats

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The Heat Capacity of Cu(NO 3 ) 2 ·2.5H 2 O at Low Temperatures journal, February 1968

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

Low‐Temperature Magnetization of Cu(NO ₃ ) ₂ ·2.5H ₂ O
journal, March 1969

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journal, August 2003

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journal, June 2006

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journal, January 2012

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journal, January 2002

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journal, May 2000

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journal, March 2011

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journal, July 1974

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journal, May 2003

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journal, August 2011

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journal, April 1998

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journal, October 2012

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journal, June 1994

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journal, April 2007

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journal, March 1973

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journal, February 2003

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journal, November 1994

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journal, January 1978

Quantum Criticality: Competing Ground States in Low Dimensions
journal, April 2000

The Heat Capacity of Cu(NO ₃ ) ₂ ·2.5H ₂ O at Low Temperatures
journal, February 1968

An experimental study on the magnetic properties of the singlet ground-state system in Cu(NO3)2.2H2O
journal, April 1978

Field-induced Néel ordering in the spin gap systems TlCuCl3 and KCuCl3
journal, January 2001

Proton Magnetic Resonance Study of Magnetic Ordering in Two Cupric Salts
journal, February 1968

Alternating linear-chain antiferromagnetism in copper nitrate Cu ${(N O_{3})}_{2}$ .2.5 $H_{2}$ O
journal, January 1983

Magnetic excitations in the quantum spin system KCuCl
journal, February 1999

Quantum spin dynamics of the antiferromagnetic linear chain in zero and nonzero magnetic field
journal, August 1981

Phase diagram and spin Hamiltonian of weakly-coupled anisotropic $S = \frac{1}{2}$ chains in $Cu {Cl}_{2} ∙ 2 ({(C D_{3})}_{2} S O)$
journal, June 2007

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journal, March 2008

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journal, October 2002

Theory of Haldane-gap antiferromagnets in applied fields
journal, April 1990

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journal, September 1970

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journal, June 1998

A study of the high field phase transition in
journal, January 1977

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journal, June 2013

Anisotropic Spin Freezing in the $S = 1 / 2$ Zigzag Chain Compound ${SrCuO}_{2}$
journal, December 1999

Magnetic Susceptibility of Cu ${(N O_{3})}_{2}$ ·2.5 $H_{2}$ O at Low Temperature
journal, November 1963

Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet
journal, February 2007

Specific heat study of SrCu2(BO3)2
journal, June 2000

Specific heat and NMR of Cu(NO3)2·H2O at the high-field phase transition
journal, March 1973

Quantum phase transitions in coupled dimer compounds
journal, July 2005

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journal, July 1997

Triplet Modes in a Quantum spin Liquid Across the Critical Field
journal, August 2002

Magnetic ordering in Cu ${(N O_{3})}_{2}$ ·2.5 $D_{2}$ O
journal, December 1979

Dominance of long-lived excitations in the antiferromagnetic spin-1 chain NENP
journal, December 1992

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journal, November 1998

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journal, November 2008

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journal, December 1956

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journal, April 2001

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Spin Ordering and Thermodynamical Properties in Spin-Pair Systems under Magnetic Fields
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journal, January 1987

Frustration-induced two-dimensional quantum disordered phase in piperazinium hexachlorodicuprate
journal, September 2001

Spin dynamics of dimerised singlet ground-state systems with magnetic field and anisotropy effects
journal, July 1986