<p>We report electron spin resonance studies of double perovskite Ba<InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="723_2025_1811_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">$_2$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>CoWO<InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="723_2025_1811_Article_IEq2.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">$_6$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>6</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> single crystals. Above <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="723_2025_1811_Article_IEq7.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="59" /> </InlineMediaObject> <EquationSource Format="TEX">$T_\textrm{N} = 14$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>T</mi> <mtext>N</mtext> </msub> <mo>=</mo> <mn>14</mn> </mrow> </math></EquationSource> </InlineEquation> K, we observe a paramagnetic resonance with <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="723_2025_1811_Article_IEq8.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="75" /> </InlineMediaObject> <EquationSource Format="TEX">$g_\textrm{eff}\simeq 3.66$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>g</mi> <mtext>eff</mtext> </msub> <mo>≃</mo> <mn>3.66</mn> </mrow> </math></EquationSource> </InlineEquation>. Upon cooling, this mode transforms into a broad antiferromagnetic resonance (AFMR) with a zero-field energy gap of about 200 GHz. The AFMR becomes barely detectable at low magnetic fields, indicating unusually strong decay processes. We argue that symmetry-allowed anisotropic spin–spin interactions are a possible reason for the pronounced spin-wave damping. Linear spin-wave theory calculations support this scenario.</p>

Electron Spin Resonance in the Double-Perovskite Oxide Antiferromagnet Ba$_2$CoWO$_6$

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2025年10月20日

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K. Yu. Povarov,
J. Wosnitza,
A. R. N. Hanna,
A. T. M. Nazmul Islam,
B. Lake,
S. A. Zvyagin

摘要

We report electron spin resonance studies of double perovskite Ba $_2$ $_{2}$ CoWO $_6$ $_{6}$ single crystals. Above $T_\textrm{N} = 14$ $T_{N} = 14$ K, we observe a paramagnetic resonance with $g_\textrm{eff}\simeq 3.66$ $g_{eff} ≃ 3.66$ . Upon cooling, this mode transforms into a broad antiferromagnetic resonance (AFMR) with a zero-field energy gap of about 200 GHz. The AFMR becomes barely detectable at low magnetic fields, indicating unusually strong decay processes. We argue that symmetry-allowed anisotropic spin–spin interactions are a possible reason for the pronounced spin-wave damping. Linear spin-wave theory calculations support this scenario.

Electron Spin Resonance in the Double-Perovskite Oxide Antiferromagnet Ba\(_2\)CoWO\(_6\)

摘要