Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4

Ellen Fogh, Rasmus Toft-Petersen, Eric Ressouche, Christof Niedermayer, Sonja Lindahl Holm, Maciej Bartkowiak, Oleksandr Prokhnenko, Steffen Sloth, Frederik Werner Isaksen, David Vaknin, Niels Bech Christensen

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Abstract

The magnetic phase diagram of magnetoelectric LiCoPO4 is established using neutron diffraction and magnetometry in fields up to 25.9 T applied along the crystallographic b axis. For fields greater than 11.9 T, the magnetic unit cell triples in size with propagation vector Q = (0, 1/3,0). A magnetized elliptic cycloid is formed with spins in the (b, c) plane and the major axis oriented along b. Such a structure allows for the magnetoelectric effect with an electric polarization along c induced by magnetic fields applied along b. Intriguingly, additional ordering vectors Q ≈ to (0, 1/4,0) and Q ≈ to (0, 1/2,0) appear for increasing fields in the hysteresis region below the transition field. Traces of this behavior are also observed in the magnetization. A simple model based on a mean-field approach is proposed to explain these additional ordering vectors. In the field interval 20.5-21.0 T, the propagation vector Q = (0, 1/3,0) remains but the spins orient differently compared to the cycloid phase. Above 21.0 T and up until saturation, a commensurate magnetic structure exists with a ferromagnetic component along b and an antiferromagnetic component along c.
Original languageEnglish
Article number104420
JournalPhysical Review B
Volume96
Issue number10
Number of pages10
ISSN2469-9950
DOIs
Publication statusPublished - 2017

Bibliographical note

©2017 American Physical Society

Cite this

Fogh, Ellen ; Toft-Petersen, Rasmus ; Ressouche, Eric ; Niedermayer, Christof ; Holm, Sonja Lindahl ; Bartkowiak, Maciej ; Prokhnenko, Oleksandr ; Sloth, Steffen ; Isaksen, Frederik Werner ; Vaknin, David ; Christensen, Niels Bech. / Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4. In: Physical Review B. 2017 ; Vol. 96, No. 10.
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title = "Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4",
abstract = "The magnetic phase diagram of magnetoelectric LiCoPO4 is established using neutron diffraction and magnetometry in fields up to 25.9 T applied along the crystallographic b axis. For fields greater than 11.9 T, the magnetic unit cell triples in size with propagation vector Q = (0, 1/3,0). A magnetized elliptic cycloid is formed with spins in the (b, c) plane and the major axis oriented along b. Such a structure allows for the magnetoelectric effect with an electric polarization along c induced by magnetic fields applied along b. Intriguingly, additional ordering vectors Q ≈ to (0, 1/4,0) and Q ≈ to (0, 1/2,0) appear for increasing fields in the hysteresis region below the transition field. Traces of this behavior are also observed in the magnetization. A simple model based on a mean-field approach is proposed to explain these additional ordering vectors. In the field interval 20.5-21.0 T, the propagation vector Q = (0, 1/3,0) remains but the spins orient differently compared to the cycloid phase. Above 21.0 T and up until saturation, a commensurate magnetic structure exists with a ferromagnetic component along b and an antiferromagnetic component along c.",
author = "Ellen Fogh and Rasmus Toft-Petersen and Eric Ressouche and Christof Niedermayer and Holm, {Sonja Lindahl} and Maciej Bartkowiak and Oleksandr Prokhnenko and Steffen Sloth and Isaksen, {Frederik Werner} and David Vaknin and Christensen, {Niels Bech}",
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Fogh, E, Toft-Petersen, R, Ressouche, E, Niedermayer, C, Holm, SL, Bartkowiak, M, Prokhnenko, O, Sloth, S, Isaksen, FW, Vaknin, D & Christensen, NB 2017, 'Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4', Physical Review B, vol. 96, no. 10, 104420. https://doi.org/10.1103/PhysRevB.96.104420

Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4. / Fogh, Ellen; Toft-Petersen, Rasmus; Ressouche, Eric; Niedermayer, Christof; Holm, Sonja Lindahl; Bartkowiak, Maciej; Prokhnenko, Oleksandr; Sloth, Steffen; Isaksen, Frederik Werner; Vaknin, David; Christensen, Niels Bech.

In: Physical Review B, Vol. 96, No. 10, 104420, 2017.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Magnetic order, hysteresis, and phase coexistence in magnetoelectric LiCoPO4

AU - Fogh, Ellen

AU - Toft-Petersen, Rasmus

AU - Ressouche, Eric

AU - Niedermayer, Christof

AU - Holm, Sonja Lindahl

AU - Bartkowiak, Maciej

AU - Prokhnenko, Oleksandr

AU - Sloth, Steffen

AU - Isaksen, Frederik Werner

AU - Vaknin, David

AU - Christensen, Niels Bech

N1 - ©2017 American Physical Society

PY - 2017

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N2 - The magnetic phase diagram of magnetoelectric LiCoPO4 is established using neutron diffraction and magnetometry in fields up to 25.9 T applied along the crystallographic b axis. For fields greater than 11.9 T, the magnetic unit cell triples in size with propagation vector Q = (0, 1/3,0). A magnetized elliptic cycloid is formed with spins in the (b, c) plane and the major axis oriented along b. Such a structure allows for the magnetoelectric effect with an electric polarization along c induced by magnetic fields applied along b. Intriguingly, additional ordering vectors Q ≈ to (0, 1/4,0) and Q ≈ to (0, 1/2,0) appear for increasing fields in the hysteresis region below the transition field. Traces of this behavior are also observed in the magnetization. A simple model based on a mean-field approach is proposed to explain these additional ordering vectors. In the field interval 20.5-21.0 T, the propagation vector Q = (0, 1/3,0) remains but the spins orient differently compared to the cycloid phase. Above 21.0 T and up until saturation, a commensurate magnetic structure exists with a ferromagnetic component along b and an antiferromagnetic component along c.

AB - The magnetic phase diagram of magnetoelectric LiCoPO4 is established using neutron diffraction and magnetometry in fields up to 25.9 T applied along the crystallographic b axis. For fields greater than 11.9 T, the magnetic unit cell triples in size with propagation vector Q = (0, 1/3,0). A magnetized elliptic cycloid is formed with spins in the (b, c) plane and the major axis oriented along b. Such a structure allows for the magnetoelectric effect with an electric polarization along c induced by magnetic fields applied along b. Intriguingly, additional ordering vectors Q ≈ to (0, 1/4,0) and Q ≈ to (0, 1/2,0) appear for increasing fields in the hysteresis region below the transition field. Traces of this behavior are also observed in the magnetization. A simple model based on a mean-field approach is proposed to explain these additional ordering vectors. In the field interval 20.5-21.0 T, the propagation vector Q = (0, 1/3,0) remains but the spins orient differently compared to the cycloid phase. Above 21.0 T and up until saturation, a commensurate magnetic structure exists with a ferromagnetic component along b and an antiferromagnetic component along c.

U2 - 10.1103/PhysRevB.96.104420

DO - 10.1103/PhysRevB.96.104420

M3 - Journal article

VL - 96

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 1098-0121

IS - 10

M1 - 104420

ER -