Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba2YMoO6

J. P. Carlo; J. P. Clancy; T. Aharen; Z. Yamani; J. P.C. Ruff; J. J. Wagman; G. J. Van Gastel; H. M.L. Noad; G. E. Granroth; J. E. Greedan; H. A. Dabkowska; B. D. Gaulin

doi:10.1103/PhysRevB.84.100404

Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba₂YMoO₆

J. P. Carlo, J. P. Clancy, T. Aharen, Z. Yamani, J. P.C. Ruff, J. J. Wagman, G. J. Van Gastel, H. M.L. Noad, G. E. Granroth, J. E. Greedan, H. A. Dabkowska, B. D. Gaulin

Direct Geometry

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

62 Scopus citations

Abstract

The geometrically frustrated double perovskite Ba₂YMoO ₆ is characterized by quantum s=1/2 spins at the Mo5⁺ sites of an undistorted fcc lattice. Previous low-temperature characterization revealed an absence of static long-range magnetic order and suggested a nonmagnetic spin-singlet ground state. We report unique time-of-flight and triple-axis neutron spectroscopy of Ba₂YMoO₆ that shows a 28 meV spin excitation with a bandwidth of ∼4 meV, which vanishes above ∼125 K. We identify this as the singlet-triplet excitation that arises out of a singlet ground state, and further identify a weaker continuum of magnetic states within the gap, reminiscent of spin-polaron states arising due to weak disorder.

Original language	English
Article number	100404
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.84.100404
State	Published - Sep 19 2011

Access to Document

10.1103/PhysRevB.84.100404

Cite this

Carlo, J. P., Clancy, J. P., Aharen, T., Yamani, Z., Ruff, J. P. C., Wagman, J. J., Van Gastel, G. J., Noad, H. M. L., Granroth, G. E., Greedan, J. E., Dabkowska, H. A., & Gaulin, B. D. (2011). Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba₂YMoO₆. Physical Review B - Condensed Matter and Materials Physics, 84(10), Article 100404. https://doi.org/10.1103/PhysRevB.84.100404

@article{4332baabbdc146bc85ce0c6fc2ab32b1,

title = "Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba2YMoO6",

abstract = "The geometrically frustrated double perovskite Ba2YMoO 6 is characterized by quantum s=1/2 spins at the Mo5+ sites of an undistorted fcc lattice. Previous low-temperature characterization revealed an absence of static long-range magnetic order and suggested a nonmagnetic spin-singlet ground state. We report unique time-of-flight and triple-axis neutron spectroscopy of Ba2YMoO6 that shows a 28 meV spin excitation with a bandwidth of ∼4 meV, which vanishes above ∼125 K. We identify this as the singlet-triplet excitation that arises out of a singlet ground state, and further identify a weaker continuum of magnetic states within the gap, reminiscent of spin-polaron states arising due to weak disorder.",

author = "Carlo, {J. P.} and Clancy, {J. P.} and T. Aharen and Z. Yamani and Ruff, {J. P.C.} and Wagman, {J. J.} and {Van Gastel}, {G. J.} and Noad, {H. M.L.} and Granroth, {G. E.} and Greedan, {J. E.} and Dabkowska, {H. A.} and Gaulin, {B. D.}",

year = "2011",

month = sep,

day = "19",

doi = "10.1103/PhysRevB.84.100404",

language = "English",

volume = "84",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "10",

}

Carlo, JP, Clancy, JP, Aharen, T, Yamani, Z, Ruff, JPC, Wagman, JJ, Van Gastel, GJ, Noad, HML, Granroth, GE, Greedan, JE, Dabkowska, HA & Gaulin, BD 2011, 'Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba₂YMoO₆', Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 10, 100404. https://doi.org/10.1103/PhysRevB.84.100404

TY - JOUR

T1 - Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba2YMoO6

AU - Carlo, J. P.

AU - Clancy, J. P.

AU - Aharen, T.

AU - Yamani, Z.

AU - Ruff, J. P.C.

AU - Wagman, J. J.

AU - Van Gastel, G. J.

AU - Noad, H. M.L.

AU - Granroth, G. E.

AU - Greedan, J. E.

AU - Dabkowska, H. A.

AU - Gaulin, B. D.

PY - 2011/9/19

Y1 - 2011/9/19

N2 - The geometrically frustrated double perovskite Ba2YMoO 6 is characterized by quantum s=1/2 spins at the Mo5+ sites of an undistorted fcc lattice. Previous low-temperature characterization revealed an absence of static long-range magnetic order and suggested a nonmagnetic spin-singlet ground state. We report unique time-of-flight and triple-axis neutron spectroscopy of Ba2YMoO6 that shows a 28 meV spin excitation with a bandwidth of ∼4 meV, which vanishes above ∼125 K. We identify this as the singlet-triplet excitation that arises out of a singlet ground state, and further identify a weaker continuum of magnetic states within the gap, reminiscent of spin-polaron states arising due to weak disorder.

AB - The geometrically frustrated double perovskite Ba2YMoO 6 is characterized by quantum s=1/2 spins at the Mo5+ sites of an undistorted fcc lattice. Previous low-temperature characterization revealed an absence of static long-range magnetic order and suggested a nonmagnetic spin-singlet ground state. We report unique time-of-flight and triple-axis neutron spectroscopy of Ba2YMoO6 that shows a 28 meV spin excitation with a bandwidth of ∼4 meV, which vanishes above ∼125 K. We identify this as the singlet-triplet excitation that arises out of a singlet ground state, and further identify a weaker continuum of magnetic states within the gap, reminiscent of spin-polaron states arising due to weak disorder.

UR - http://www.scopus.com/inward/record.url?scp=80053589945&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.84.100404

DO - 10.1103/PhysRevB.84.100404

M3 - Article

AN - SCOPUS:80053589945

SN - 1098-0121

VL - 84

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 10

M1 - 100404

ER -

Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba₂YMoO₆

Abstract

Access to Document

Other files and links

Fingerprint

Cite this