Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.

J. Larsen; T. K. Schäffer; U. B. Hansen; S. L. Holm; S. R. Ahl; R. Toft-Petersen; J. Taylor; G. Ehlers; J. Jensen; H. M. Rønnow; K. Lefmann; N. B. Christensen

doi:10.1103/PhysRevB.96.174424

Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.

J. Larsen, T. K. Schäffer, U. B. Hansen, S. L. Holm, S. R. Ahl, R. Toft-Petersen, J. Taylor, G. Ehlers, J. Jensen, H. M. Rønnow, K. Lefmann, N. B. Christensen

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Abstract

We present experimental evidence for a quantum phase transition in the easy-axis S=3/2 anisotropic quasi-one-dimensional ferromagnet CoCl2·2D2O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ0Hc=16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H>Hc. The field dependence of the order parameter and the gap are well described by critical exponents β=0.45±0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl2·2D2O differs significantly from the textbook version of a S=1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.

Original language	English
Article number	174424
Journal	Physical Review B
Volume	96
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.96.174424
State	Published - Nov 20 2017

Funding

This paper is based in part on experiments performed at the Helmholtz-Zentrum Berlin (HZB), ISIS Pulsed Neutron and Muon Source, and the Swiss Spallation Neutron Source (SINQ), Paul Scherrer Institute, Villigen, Switzerland. Part of this research used resources at the Spallation Neutron Source (SNS), a DOE Office of Science user facility operated by the Oak Ridge National Laboratory. We thank S. Eisenhardt, M. Sales, A. Baden, S. Adsersen, M. R. Millan, M. D. Le, and M. Frontzek for taking part in some of the experiments. The project was supported by the Danish Agency for Science and Higher Education through DANSCATT.

Funders	Funder number
DanScatt
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	166298
Danish Agency for Science and Higher Education

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10.1103/PhysRevB.96.174424

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Larsen, J., Schäffer, T. K., Hansen, U. B., Holm, S. L., Ahl, S. R., Toft-Petersen, R., Taylor, J., Ehlers, G., Jensen, J., Rønnow, H. M., Lefmann, K., & Christensen, N. B. (2017). Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al. Physical Review B, 96(17), Article 174424. https://doi.org/10.1103/PhysRevB.96.174424

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title = "Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.",

abstract = "We present experimental evidence for a quantum phase transition in the easy-axis S=3/2 anisotropic quasi-one-dimensional ferromagnet CoCl2·2D2O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ0Hc=16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H>Hc. The field dependence of the order parameter and the gap are well described by critical exponents β=0.45±0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl2·2D2O differs significantly from the textbook version of a S=1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.",

author = "J. Larsen and Sch{\"a}ffer, {T. K.} and Hansen, {U. B.} and Holm, {S. L.} and Ahl, {S. R.} and R. Toft-Petersen and J. Taylor and G. Ehlers and J. Jensen and R{\o}nnow, {H. M.} and K. Lefmann and Christensen, {N. B.}",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = nov,

day = "20",

doi = "10.1103/PhysRevB.96.174424",

language = "English",

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Larsen, J, Schäffer, TK, Hansen, UB, Holm, SL, Ahl, SR, Toft-Petersen, R, Taylor, J, Ehlers, G, Jensen, J, Rønnow, HM, Lefmann, K & Christensen, NB 2017, 'Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.', Physical Review B, vol. 96, no. 17, 174424. https://doi.org/10.1103/PhysRevB.96.174424

Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al. / Larsen, J.; Schäffer, T. K.; Hansen, U. B. et al.
In: Physical Review B, Vol. 96, No. 17, 174424, 20.11.2017.

Research output: Contribution to journal › Article › peer-review

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T1 - Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.

AU - Larsen, J.

AU - Schäffer, T. K.

AU - Hansen, U. B.

AU - Holm, S. L.

AU - Ahl, S. R.

AU - Toft-Petersen, R.

AU - Taylor, J.

AU - Ehlers, G.

AU - Jensen, J.

AU - Rønnow, H. M.

AU - Lefmann, K.

AU - Christensen, N. B.

PY - 2017/11/20

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N2 - We present experimental evidence for a quantum phase transition in the easy-axis S=3/2 anisotropic quasi-one-dimensional ferromagnet CoCl2·2D2O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ0Hc=16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H>Hc. The field dependence of the order parameter and the gap are well described by critical exponents β=0.45±0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl2·2D2O differs significantly from the textbook version of a S=1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.

AB - We present experimental evidence for a quantum phase transition in the easy-axis S=3/2 anisotropic quasi-one-dimensional ferromagnet CoCl2·2D2O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ0Hc=16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H>Hc. The field dependence of the order parameter and the gap are well described by critical exponents β=0.45±0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl2·2D2O differs significantly from the textbook version of a S=1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.

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Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2 D2 O in a transverse field Spin Excitations and Quantum Criticality in ... J. Larsen et al.

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