NaBaR(BO3)2 (R = Dy, Ho, Er and Tm): Structurally perfect triangular lattice materials with two rare earth layers

Shu Guo; Tai Kong; R. J. Cava

doi:10.1088/2053-1591/ab3d8e

NaBaR(BO₃)₂ (R = Dy, Ho, Er and Tm): Structurally perfect triangular lattice materials with two rare earth layers

Shu Guo, Tai Kong, R. J. Cava

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

6 Scopus citations

Abstract

We report the crystal growth of NaBaR(BO₃)₂ (R = Dy, Ho, Er and Tm) by the flux method. In the rhombohedral crystal structures, [RO₆] octahedra and planar [BO₃] units connect by bridging O atoms, forming triangular layers in the ab plane that are evenly spaced along c. Two perfectly triangular rare earth layers of identical dimension are found. Anisotropic magnetic susceptibility is observed for all; NaBaEr(BO₃)₂ is nearly isotropic while NaBaTm(BO₃)₂ is the most anisotropic. Heat capacity measurements reveal no long-range magnetic ordering down to 0.35 K for R = Dy or Er, while the Ho material displays a significant entropy loss. All the magnetic entropy appears to be absent in the Tm case by low temperature, suggesting that a singlet ground state may have formed.

Original language	English (US)
Article number	106110
Journal	Materials Research Express
Volume	6
Issue number	10
DOIs	https://doi.org/10.1088/2053-1591/ab3d8e
State	Published - Aug 30 2019

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Polymers and Plastics
Metals and Alloys

Keywords

magnetisim
rare earth elements
triangular lattice

Access to Document

10.1088/2053-1591/ab3d8e

Cite this

@article{097f2e68d9e24d68b0e3b6acfb0b0072,

title = "NaBaR(BO3)2 (R = Dy, Ho, Er and Tm): Structurally perfect triangular lattice materials with two rare earth layers",

abstract = "We report the crystal growth of NaBaR(BO3)2 (R = Dy, Ho, Er and Tm) by the flux method. In the rhombohedral crystal structures, [RO6] octahedra and planar [BO3] units connect by bridging O atoms, forming triangular layers in the ab plane that are evenly spaced along c. Two perfectly triangular rare earth layers of identical dimension are found. Anisotropic magnetic susceptibility is observed for all; NaBaEr(BO3)2 is nearly isotropic while NaBaTm(BO3)2 is the most anisotropic. Heat capacity measurements reveal no long-range magnetic ordering down to 0.35 K for R = Dy or Er, while the Ho material displays a significant entropy loss. All the magnetic entropy appears to be absent in the Tm case by low temperature, suggesting that a singlet ground state may have formed.",

keywords = "magnetisim, rare earth elements, triangular lattice",

author = "Shu Guo and Tai Kong and Cava, {R. J.}",

note = "Publisher Copyright: {\textcopyright} 2019 IOP Publishing Ltd.",

year = "2019",

month = aug,

day = "30",

doi = "10.1088/2053-1591/ab3d8e",

language = "English (US)",

volume = "6",

journal = "Materials Research Express",

issn = "2053-1591",

publisher = "IOP Publishing Ltd.",

number = "10",

}

TY - JOUR

T1 - NaBaR(BO3)2 (R = Dy, Ho, Er and Tm)

T2 - Structurally perfect triangular lattice materials with two rare earth layers

AU - Guo, Shu

AU - Kong, Tai

AU - Cava, R. J.

PY - 2019/8/30

Y1 - 2019/8/30

N2 - We report the crystal growth of NaBaR(BO3)2 (R = Dy, Ho, Er and Tm) by the flux method. In the rhombohedral crystal structures, [RO6] octahedra and planar [BO3] units connect by bridging O atoms, forming triangular layers in the ab plane that are evenly spaced along c. Two perfectly triangular rare earth layers of identical dimension are found. Anisotropic magnetic susceptibility is observed for all; NaBaEr(BO3)2 is nearly isotropic while NaBaTm(BO3)2 is the most anisotropic. Heat capacity measurements reveal no long-range magnetic ordering down to 0.35 K for R = Dy or Er, while the Ho material displays a significant entropy loss. All the magnetic entropy appears to be absent in the Tm case by low temperature, suggesting that a singlet ground state may have formed.

AB - We report the crystal growth of NaBaR(BO3)2 (R = Dy, Ho, Er and Tm) by the flux method. In the rhombohedral crystal structures, [RO6] octahedra and planar [BO3] units connect by bridging O atoms, forming triangular layers in the ab plane that are evenly spaced along c. Two perfectly triangular rare earth layers of identical dimension are found. Anisotropic magnetic susceptibility is observed for all; NaBaEr(BO3)2 is nearly isotropic while NaBaTm(BO3)2 is the most anisotropic. Heat capacity measurements reveal no long-range magnetic ordering down to 0.35 K for R = Dy or Er, while the Ho material displays a significant entropy loss. All the magnetic entropy appears to be absent in the Tm case by low temperature, suggesting that a singlet ground state may have formed.

KW - magnetisim

KW - rare earth elements

KW - triangular lattice

UR - http://www.scopus.com/inward/record.url?scp=85071668130&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85071668130&partnerID=8YFLogxK

U2 - 10.1088/2053-1591/ab3d8e

DO - 10.1088/2053-1591/ab3d8e

M3 - Article

AN - SCOPUS:85071668130

SN - 2053-1591

VL - 6

JO - Materials Research Express

JF - Materials Research Express

IS - 10

M1 - 106110

ER -