High-pressure synthesis of quantum magnet
                    <math>
                      <mrow>
                        <mi>M</mi>
                        <mtext>−</mtext>
                        <msub>
                          <mi>YbTaO</mi>
                          <mn>4</mn>
                        </msub>
                      </mrow>
                    </math>
                    with a stretched diamond lattice

Nicola D. Kelly; Xuan Liang; Siân E. Dutton; Kazunari Yamaura; Yoshihiro Tsujimoto

doi:10.1103/3xqz-qzr7

Article High-pressure synthesis of quantum magnet

M − {YbTaO}_{4}

with a stretched diamond lattice

Nicola D. Kelly ; Xuan Liang ; Siân E. Dutton ; Kazunari Yamaura ; Yoshihiro Tsujimoto

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Nicola D. Kelly, Xuan Liang, Siân E. Dutton, Kazunari Yamaura, Yoshihiro Tsujimoto. High-pressure synthesis of quantum magnet

M − {YbTaO}_{4}

with a stretched diamond lattice. Physical Review Materials. 2026, 10 (2), 024411. https://doi.org/10.1103/3xqz-qzr7

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(abstract)

We report bulk magnetic properties of ytterbium tantalate in its monoclinic fergusonite modiﬁcation, M-YbTaO4 . The spin- 12 Yb3+ ions in this phase are arranged on a geometrically frustrated “stretched diamond” lattice. M-YbTaO4 cannot be prepared at ambient pressure and was instead prepared in a belt-type apparatus at 6 GPa and 1800 ◦C. Susceptibility and speciﬁc heat data show no long-range ordering down to 1.8 K and are consistent with a Jeff = 12 Kramers doublet which splits in an applied ﬁeld. Furthermore, under high-pressure synthesis the entire solid solution YbNbx Ta 1−x O4 (0 . x . 1) can be stabilized in the M phase, in contrast to ambient-pressure synthesis which favors the competing M. phase for Ta-rich compositions. Subsequent
annealing of the Nb-Ta mixed samples resulted in color changes, suggesting oxygen deﬁciency in some of the as-prepared high pressure samples. There was little variation in the bulk magnetic properties upon varying either the Nb/Ta ratio or the annealing conditions.

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