Journal Article

IMPULSE-2023-00110

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ordered and disordered variants of the triangular lattice antiferromagnet Ca$_3$NiNb$_2$O$_9$: Crystal growth and magnetic properties

Rout, D. (Corresponding author) ; Tang, R.MLZ* ; Skoulatos, M.MLZ* ; Ouladdiaf, B. ; Kinoshita, Y. ; Miyake, A. ; Tokunaga, M. ; Mahapatra, S. ; Singh, S.

2023
APS College Park, MD

Please use a persistent id in citations: doi:10.1103/PhysRevMaterials.7.024419

Abstract: Single crystals of the triangular lattice antiferromagnet (TLAF) Ca3NiNb2O9 and its nonmagnetic analog Ca3MgNb2O9 are grown using the four-mirror optical floating-zone furnace. By varying the growth conditions, two types of mm-sized crystals are obtained: monoclinic crystals of the formCa3NiNb2O9 where Ni2+ and Nb5+ exhibits 1:2 ordering and Ni ions (spin 1) are arranged on a triangular lattice, and orthorhombic crystals of the form CaBO3 where B site is occupied randomly by 1/3 Ni and 2/3 Nb. Low-temperature specific heat and low-field magnetization on these crystal modifications revealed contrasting ground states. In B-site ordered Ca3NiNb2O9, the Ni spins undergo two successive phase transitions at TN1=4.6K and TN2=4.2K. The magnetic propagation vector below TN2 is found to be →k=(0,1/3,0) confirming the 120∘ spin structure. The high-field magnetization reveals the presence of plateaus characteristic of TLAFs. In contrast, the orthorhombicCaBO3 crystals exhibit a spin-glass-like ground state.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. MIRA (MIRA)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2023

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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