J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

L. Yang; Minki Jeong; P. Babkevich; V. M. Katukuri; B. Náfrádi; N. E. Shaik; A. Magrez; H. Berger; J. Schefer; E. Ressouche; M. Kriener; I. Živković; O. V. Yazyev; L. Forró; H. M. Rønnow

doi:10.1103/PhysRevB.96.024445

J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

L. Yang, Minki Jeong, P. Babkevich, V. M. Katukuri, B. Náfrádi, N. E. Shaik, A. Magrez, H. Berger, J. Schefer, E. Ressouche, M. Kriener, I. Živković, O. V. Yazyev, L. Forró, H. M. Rønnow

Physics and Astronomy

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Abstract

We report magnetic and thermodynamic properties of a 4d1 (Mo5+) magnetic insulator MoOPO4 single crystal, which realizes a J1−J2 Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which is also confirmed by magnetic susceptibility, ESR, and neutron diffraction measurements. Magnetic entropy deduced from the specific heat corresponds to a two-level degree of freedom per Mo5+ ion, and the effective moment from the susceptibility corresponds to the spin-only value. Using ab initio quantum chemistry calculations, we demonstrate that the Mo5+ ion hosts a purely spin-1/2 magnetic moment, indicating negligible effects of spin-orbit interaction. The quenched orbital moments originate from the large displacement of Mo ions inside the MoO6 octahedra along the apical direction. The ground state is shown by neutron diffraction to support a collinear Néel-type magnetic order, and a spin-flop transition is observed around an applied magnetic field of 3.5 T. The magnetic phase diagram is reproduced by a mean-field calculation assuming a small easy-axis anisotropy in the exchange interactions. Our results suggest 4d molybdates as an alternative playground to search for model quantum magnets.

Original language	English
Article number	024445
Journal	Physical Review B
Volume	96
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.96.024445
Publication status	Published - 28 Jul 2017

Keywords

quantum magnetism

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Yang, L., Jeong, M., Babkevich, P., Katukuri, V. M., Náfrádi, B., Shaik, N. E., Magrez, A., Berger, H., Schefer, J., Ressouche, E., Kriener, M., Živković, I., Yazyev, O. V., Forró, L., & Rønnow, H. M. (2017). J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4. Physical Review B, 96(2), Article 024445. https://doi.org/10.1103/PhysRevB.96.024445

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title = "J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4",

abstract = "We report magnetic and thermodynamic properties of a 4d1 (Mo5+) magnetic insulator MoOPO4 single crystal, which realizes a J1−J2 Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which is also confirmed by magnetic susceptibility, ESR, and neutron diffraction measurements. Magnetic entropy deduced from the specific heat corresponds to a two-level degree of freedom per Mo5+ ion, and the effective moment from the susceptibility corresponds to the spin-only value. Using ab initio quantum chemistry calculations, we demonstrate that the Mo5+ ion hosts a purely spin-1/2 magnetic moment, indicating negligible effects of spin-orbit interaction. The quenched orbital moments originate from the large displacement of Mo ions inside the MoO6 octahedra along the apical direction. The ground state is shown by neutron diffraction to support a collinear N{\'e}el-type magnetic order, and a spin-flop transition is observed around an applied magnetic field of 3.5 T. The magnetic phase diagram is reproduced by a mean-field calculation assuming a small easy-axis anisotropy in the exchange interactions. Our results suggest 4d molybdates as an alternative playground to search for model quantum magnets.",

keywords = "quantum magnetism",

author = "L. Yang and Minki Jeong and P. Babkevich and Katukuri, {V. M.} and B. N{\'a}fr{\'a}di and Shaik, {N. E.} and A. Magrez and H. Berger and J. Schefer and E. Ressouche and M. Kriener and I. {\v Z}ivkovi{\'c} and Yazyev, {O. V.} and L. Forr{\'o} and R{\o}nnow, {H. M.}",

year = "2017",

month = jul,

day = "28",

doi = "10.1103/PhysRevB.96.024445",

language = "English",

volume = "96",

journal = "Physical Review B",

issn = "1098-0121",

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TY - JOUR

T1 - J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

AU - Yang, L.

AU - Jeong, Minki

AU - Babkevich, P.

AU - Katukuri, V. M.

AU - Náfrádi, B.

AU - Shaik, N. E.

AU - Magrez, A.

AU - Berger, H.

AU - Schefer, J.

AU - Ressouche, E.

AU - Kriener, M.

AU - Živković, I.

AU - Yazyev, O. V.

AU - Forró, L.

AU - Rønnow, H. M.

PY - 2017/7/28

Y1 - 2017/7/28

N2 - We report magnetic and thermodynamic properties of a 4d1 (Mo5+) magnetic insulator MoOPO4 single crystal, which realizes a J1−J2 Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which is also confirmed by magnetic susceptibility, ESR, and neutron diffraction measurements. Magnetic entropy deduced from the specific heat corresponds to a two-level degree of freedom per Mo5+ ion, and the effective moment from the susceptibility corresponds to the spin-only value. Using ab initio quantum chemistry calculations, we demonstrate that the Mo5+ ion hosts a purely spin-1/2 magnetic moment, indicating negligible effects of spin-orbit interaction. The quenched orbital moments originate from the large displacement of Mo ions inside the MoO6 octahedra along the apical direction. The ground state is shown by neutron diffraction to support a collinear Néel-type magnetic order, and a spin-flop transition is observed around an applied magnetic field of 3.5 T. The magnetic phase diagram is reproduced by a mean-field calculation assuming a small easy-axis anisotropy in the exchange interactions. Our results suggest 4d molybdates as an alternative playground to search for model quantum magnets.

AB - We report magnetic and thermodynamic properties of a 4d1 (Mo5+) magnetic insulator MoOPO4 single crystal, which realizes a J1−J2 Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which is also confirmed by magnetic susceptibility, ESR, and neutron diffraction measurements. Magnetic entropy deduced from the specific heat corresponds to a two-level degree of freedom per Mo5+ ion, and the effective moment from the susceptibility corresponds to the spin-only value. Using ab initio quantum chemistry calculations, we demonstrate that the Mo5+ ion hosts a purely spin-1/2 magnetic moment, indicating negligible effects of spin-orbit interaction. The quenched orbital moments originate from the large displacement of Mo ions inside the MoO6 octahedra along the apical direction. The ground state is shown by neutron diffraction to support a collinear Néel-type magnetic order, and a spin-flop transition is observed around an applied magnetic field of 3.5 T. The magnetic phase diagram is reproduced by a mean-field calculation assuming a small easy-axis anisotropy in the exchange interactions. Our results suggest 4d molybdates as an alternative playground to search for model quantum magnets.

KW - quantum magnetism

U2 - 10.1103/PhysRevB.96.024445

DO - 10.1103/PhysRevB.96.024445

M3 - Article

SN - 1098-0121

VL - 96

JO - Physical Review B

JF - Physical Review B

IS - 2

M1 - 024445

ER -

J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

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