Scholarlink

<p>We report a <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(^{139}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>139</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>La-NMR study of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\textrm{Ba}_{2}\textrm{La}_{2}\textrm{CoTe}_{2}\textrm{O}_{12}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>Ba</mtext> <mn>2</mn> </msub> <msub> <mtext>La</mtext> <mn>2</mn> </msub> <msub> <mtext>CoTe</mtext> <mn>2</mn> </msub> <msub> <mtext>O</mtext> <mn>12</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(S=1/2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>S</mi> <mo>=</mo> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation> equilateral triangular-lattice antiferromagnet with easy-plane anisotropy at low temperatures. This compound undergoes a magnetic phase transition at <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(T_\textrm{N} =\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>T</mi> <mtext>N</mtext> </msub> <mo>=</mo> </mrow> </math></EquationSource> </InlineEquation> 3.26 K into an ordered state with the <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\({120}^\circ\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>120</mn> </mrow> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> spin structure. Under magnetic fields above 3T, <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(T_\textrm{N}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>N</mtext> </msub> </math></EquationSource> </InlineEquation> splits into <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(T_\textrm{N1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>N1</mtext> </msub> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(T_\textrm{N2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>N2</mtext> </msub> </math></EquationSource> </InlineEquation>, which correspond to the transitions from the paramagnetic phase to the up-up-down (uud) phase and from the uud phase to the triangular coplanar phase, respectively. The NMR spin-lattice relaxation rate <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(1/T_1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mo stretchy="false">/</mo> <msub> <mi>T</mi> <mn>1</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> exhibits a critical divergence at <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(T_\textrm{N1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>N1</mtext> </msub> </math></EquationSource> </InlineEquation>, indicating the onset of long-range magnetic order. At <InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(T_\textrm{N2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>N2</mtext> </msub> </math></EquationSource> </InlineEquation>, the NMR-linewidth measured at 5.4 T exhibits an anomalous decrease, which we attribute to a change in the spin structure from the uud to the triangular coplanar phase.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

NMR Study on Equilateral Triangular Lattice Antiferromagnet \(\textrm{Ba}_{2}\textrm{La}_{2}\textrm{CoTe}_{2}\textrm{O}_{12}\)

  • 期刊论文

  • 发表日期：

    2026年2月14日

查看全文
  • Keito Morioka,
  • Takayuki Goto,
  • Masari Watanabe,
  • Yuki Kojima,
  • Nobuyuki Kurita,
  • Hidekazu Tanaka,
  • Satoshi Iguchi,
  • Takahiko Sasaki

摘要

We report a \(^{139}\) 139 La-NMR study of \(\textrm{Ba}_{2}\textrm{La}_{2}\textrm{CoTe}_{2}\textrm{O}_{12}\) Ba 2 La 2 CoTe 2 O 12 , \(S=1/2\) S = 1 / 2 equilateral triangular-lattice antiferromagnet with easy-plane anisotropy at low temperatures. This compound undergoes a magnetic phase transition at \(T_\textrm{N} =\) T N = 3.26 K into an ordered state with the \({120}^\circ\) 120 ∘ spin structure. Under magnetic fields above 3T, \(T_\textrm{N}\) T N splits into \(T_\textrm{N1}\) T N1 and \(T_\textrm{N2}\) T N2 , which correspond to the transitions from the paramagnetic phase to the up-up-down (uud) phase and from the uud phase to the triangular coplanar phase, respectively. The NMR spin-lattice relaxation rate \(1/T_1\) 1 / T 1 exhibits a critical divergence at \(T_\textrm{N1}\) T N1 , indicating the onset of long-range magnetic order. At \(T_\textrm{N2}\) T N2 , the NMR-linewidth measured at 5.4 T exhibits an anomalous decrease, which we attribute to a change in the spin structure from the uud to the triangular coplanar phase.