Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4

Franziska Weickert; Adam A. Aczel; Matthew B. Stone; V. Ovidiu Garlea; Chao Dong; Yoshimitsu Kohama; Roman Movshovich; Albin Demuer; Neil Harrison; Monika B. Gamża; Alexander Steppke; Manuel Brando; Helge Rosner; Alexander A. Tsirlin

doi:10.1103/PhysRevB.100.104422

Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4

Franziska Weickert, Adam A. Aczel, Matthew B. Stone, V. Ovidiu Garlea, Chao Dong, Yoshimitsu Kohama, Roman Movshovich, Albin Demuer, Neil Harrison, Monika B. Gamża, Alexander Steppke, Manuel Brando, Helge Rosner, Alexander A. Tsirlin

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Abstract

We present inelastic neutron-scattering data on the quantum paramagnet AgVOAsO4 that establish this system as a S=1/2 alternating spin chain compound and provide a direct measurement of the spin gap Δ=1.2meV. We also present experimental evidence for two different types of field-induced magnetic order between μ0Hc1=8.4T and μ0Hc2=48.9T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60 T and temperatures down to 0.1 K reveal a H-T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8 and 5.3 K, respectively. This complex phase diagram is not expected for a single-Q - BEC system and therefore establishes AgVOAsO4 as a promising multi-Q - BEC candidate capable of hosting exotic vortex phases.

Original language	English
Article number	104422
Journal	Physical Review B
Volume	100
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.100.104422
State	Published - Sep 17 2019

Funding

F.W. thanks Cristian D. Batista for fruitful discussions. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. The National High Magnetic Field Laboratory is supported by the National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the United States Department of Energy. N.H. acknowledges support from the following Department of Energy, Basic Energy Science project: Science in 100 Tesla. A.A.T. was supported by the Federal Ministry for Education and Research (Germany) through the Sofja Kovalevskaya Award of Alexander von Humboldt Foundation. F.W. thanks Cristian D. Batista for fruitful discussions. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. The National High Magnetic Field Laboratory is supported by the National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the United States Department of Energy.N.H. acknowledges support from the following Department of Energy, Basic Energy Science project: Science in 100 Tesla. A.A.T. was supported by the Federal Ministry for Education and Research (Germany) through the Sofja Kovalevskaya Award of Alexander von Humboldt Foundation.

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10.1103/PhysRevB.100.104422

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Weickert, F., Aczel, A. A., Stone, M. B., Garlea, V. O., Dong, C., Kohama, Y., Movshovich, R., Demuer, A., Harrison, N., Gamża, M. B., Steppke, A., Brando, M., Rosner, H., & Tsirlin, A. A. (2019). Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4. Physical Review B, 100(10), Article 104422. https://doi.org/10.1103/PhysRevB.100.104422

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title = "Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4",

abstract = "We present inelastic neutron-scattering data on the quantum paramagnet AgVOAsO4 that establish this system as a S=1/2 alternating spin chain compound and provide a direct measurement of the spin gap Δ=1.2meV. We also present experimental evidence for two different types of field-induced magnetic order between μ0Hc1=8.4T and μ0Hc2=48.9T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60 T and temperatures down to 0.1 K reveal a H-T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8 and 5.3 K, respectively. This complex phase diagram is not expected for a single-Q - BEC system and therefore establishes AgVOAsO4 as a promising multi-Q - BEC candidate capable of hosting exotic vortex phases.",

author = "Franziska Weickert and Aczel, {Adam A.} and Stone, {Matthew B.} and Garlea, {V. Ovidiu} and Chao Dong and Yoshimitsu Kohama and Roman Movshovich and Albin Demuer and Neil Harrison and Gam{\.z}a, {Monika B.} and Alexander Steppke and Manuel Brando and Helge Rosner and Tsirlin, {Alexander A.}",

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year = "2019",

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day = "17",

doi = "10.1103/PhysRevB.100.104422",

language = "English",

volume = "100",

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Weickert, F, Aczel, AA , Stone, MB , Garlea, VO, Dong, C, Kohama, Y, Movshovich, R, Demuer, A, Harrison, N, Gamża, MB, Steppke, A, Brando, M, Rosner, H & Tsirlin, AA 2019, 'Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4', Physical Review B, vol. 100, no. 10, 104422. https://doi.org/10.1103/PhysRevB.100.104422

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T1 - Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4

AU - Weickert, Franziska

AU - Aczel, Adam A.

AU - Stone, Matthew B.

AU - Garlea, V. Ovidiu

AU - Dong, Chao

AU - Kohama, Yoshimitsu

AU - Movshovich, Roman

AU - Demuer, Albin

AU - Harrison, Neil

AU - Gamża, Monika B.

AU - Steppke, Alexander

AU - Brando, Manuel

AU - Rosner, Helge

AU - Tsirlin, Alexander A.

PY - 2019/9/17

Y1 - 2019/9/17

N2 - We present inelastic neutron-scattering data on the quantum paramagnet AgVOAsO4 that establish this system as a S=1/2 alternating spin chain compound and provide a direct measurement of the spin gap Δ=1.2meV. We also present experimental evidence for two different types of field-induced magnetic order between μ0Hc1=8.4T and μ0Hc2=48.9T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60 T and temperatures down to 0.1 K reveal a H-T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8 and 5.3 K, respectively. This complex phase diagram is not expected for a single-Q - BEC system and therefore establishes AgVOAsO4 as a promising multi-Q - BEC candidate capable of hosting exotic vortex phases.

AB - We present inelastic neutron-scattering data on the quantum paramagnet AgVOAsO4 that establish this system as a S=1/2 alternating spin chain compound and provide a direct measurement of the spin gap Δ=1.2meV. We also present experimental evidence for two different types of field-induced magnetic order between μ0Hc1=8.4T and μ0Hc2=48.9T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60 T and temperatures down to 0.1 K reveal a H-T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8 and 5.3 K, respectively. This complex phase diagram is not expected for a single-Q - BEC system and therefore establishes AgVOAsO4 as a promising multi-Q - BEC candidate capable of hosting exotic vortex phases.

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JO - Physical Review B

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Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4

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