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• W3105816847 abstract "Ba$_8$CoNb$_6$O$_{24}$ presents a system whose Co$^{2+}$ ions have an effective spin 1/2 and construct a regular triangular-lattice antiferromagnet (TLAFM) with a very large interlayer spacing, ensuring purely two-dimensional character. We exploit this ideal realization to perform a detailed experimental analysis of the $S = 1/2$ TLAFM, which is one of the keystone models in frustrated quantum magnetism. We find strong low-energy spin fluctuations and no magnetic ordering, but a diverging correlation length down to 0.1 K, indicating a Mermin-Wagner trend towards zero-temperature order. Below 0.1 K, however, our low-field measurements show an nexpected magnetically disordered state, which is a candidate quantum spin liquid. We establish the $(H,T)$ phase diagram, mapping in detail the quantum fluctuation corrections to the available theoretical analysis. These include a strong upshift in field of the maximum ordering temperature, qualitative changes to both low- and high-field phase boundaries, and an ordered regime apparently dominated by the collinear up-up-down state. Ba$_8$CoNb$_6$O$_{24}$ therefore offers fresh input for the development of theoretical approaches to the field-induced quantum phase transitions of the $S = 1/2$ Heisenberg TLAFM." @default.
• W3105816847 created "2020-11-23" @default.
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• W3105816847 date "2018-04-13" @default.
• W3105816847 modified "2023-10-11" @default.
• W3105816847 title "Mermin-Wagner physics, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mo>(</mml:mo><mml:mi>H</mml:mi><mml:mo>,</mml:mo><mml:mi>T</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> phase diagram, and candidate quantum spin-liquid phase in the spin- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> triangular-lattice antiferromagnet <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:…" @default.
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• W3105816847 doi "https://doi.org/10.1103/physrevmaterials.2.044403" @default.
• W3105816847 hasPublicationYear "2018" @default.
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