Nao Furukawa, Qing-Ping Ding, Juan Schmidt, Sergey L. Bud'ko, Paul C. Canfield, Yuji Furukawa
{"title":"P31 NMR 揭示 Sr(Co1-xNix)2P2 中的非均相磁有序态和磁波动演化","authors":"Nao Furukawa, Qing-Ping Ding, Juan Schmidt, Sergey L. Bud'ko, Paul C. Canfield, Yuji Furukawa","doi":"10.1103/physrevb.110.014439","DOIUrl":null,"url":null,"abstract":"<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>SrCo</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>2</mn></msub></mrow></math> with a tetragonal structure is known to be a Stoner-enhanced Pauli paramagnetic metal being nearly ferromagnetic. Recently J. Schmidt <i>et al.</i> [<span>Phys. Rev. B</span> <b>108</b>, 174415 (2023)] reported that a ferromagnetic ordered state is actually induced by a small Ni substitution for Co of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>x</mi><mo>=</mo><mn>0.02</mn></mrow></math> in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>2</mn></msub></mrow></math> where an antiferromagnetic ordered phase also appears by further Ni substitution with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>x</mi><mo>=</mo><mn>0.06</mn><mo>–</mo><mn>0.35</mn></mrow></math>. Here, using nuclear magnetic resonance (NMR) measurements on <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">P</mi><mprescripts></mprescripts><none></none><mn>31</mn></mmultiscripts></math> nuclei, we have investigated how the magnetic properties change by the Ni substitution in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>2</mn></msub></mrow></math> from a microscopic point of view, especially focusing on the evolution of magnetic fluctuations with the Ni substitution and the characterization of the magnetically ordered states. The temperature dependencies of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">P</mi><mprescripts></mprescripts><none></none><mn>31</mn></mmultiscripts></math> spin-lattice relaxation rate divided by temperature <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mn>1</mn><mo>/</mo><msub><mi>T</mi><mn>1</mn></msub><mi>T</mi><mo>)</mo></mrow></math> and Knight shift <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>(</mo><mi>K</mi><mo>)</mo></math> for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>SrCo</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>2</mn></msub></mrow></math> are reasonably explained by a model where a double-peak structure for the density of states near the Fermi energy is assumed. Based on a Korringa ratio analysis using the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>1</mn></msub></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi></math> data, ferromagnetic spin fluctuations are found to dominate in the ferromagnetic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>2</mn></msub></mrow></math> as well as the antiferromagnets where no clear antiferromagnetic fluctuations are observed. We also found the distribution of the ordered Co moments in the magnetically ordered states from the analysis of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">P</mi><mprescripts></mprescripts><none></none><mn>31</mn></mmultiscripts></math>-NMR spectra exhibiting a characteristic rectangular-like shape.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Inhomogeneous magnetic ordered state and evolution of magnetic fluctuations in Sr(Co1−xNix)2P2 revealed by P31 NMR\",\"authors\":\"Nao Furukawa, Qing-Ping Ding, Juan Schmidt, Sergey L. Bud'ko, Paul C. Canfield, Yuji Furukawa\",\"doi\":\"10.1103/physrevb.110.014439\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><msub><mi>SrCo</mi><mn>2</mn></msub><msub><mi mathvariant=\\\"normal\\\">P</mi><mn>2</mn></msub></mrow></math> with a tetragonal structure is known to be a Stoner-enhanced Pauli paramagnetic metal being nearly ferromagnetic. Recently J. Schmidt <i>et al.</i> [<span>Phys. Rev. B</span> <b>108</b>, 174415 (2023)] reported that a ferromagnetic ordered state is actually induced by a small Ni substitution for Co of <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>x</mi><mo>=</mo><mn>0.02</mn></mrow></math> in <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\\\"normal\\\">P</mi><mn>2</mn></msub></mrow></math> where an antiferromagnetic ordered phase also appears by further Ni substitution with <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>x</mi><mo>=</mo><mn>0.06</mn><mo>–</mo><mn>0.35</mn></mrow></math>. Here, using nuclear magnetic resonance (NMR) measurements on <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mmultiscripts><mi mathvariant=\\\"normal\\\">P</mi><mprescripts></mprescripts><none></none><mn>31</mn></mmultiscripts></math> nuclei, we have investigated how the magnetic properties change by the Ni substitution in <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\\\"normal\\\">P</mi><mn>2</mn></msub></mrow></math> from a microscopic point of view, especially focusing on the evolution of magnetic fluctuations with the Ni substitution and the characterization of the magnetically ordered states. The temperature dependencies of the <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mmultiscripts><mi mathvariant=\\\"normal\\\">P</mi><mprescripts></mprescripts><none></none><mn>31</mn></mmultiscripts></math> spin-lattice relaxation rate divided by temperature <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mo>(</mo><mn>1</mn><mo>/</mo><msub><mi>T</mi><mn>1</mn></msub><mi>T</mi><mo>)</mo></mrow></math> and Knight shift <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mo>(</mo><mi>K</mi><mo>)</mo></math> for <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><msub><mi>SrCo</mi><mn>2</mn></msub><msub><mi mathvariant=\\\"normal\\\">P</mi><mn>2</mn></msub></mrow></math> are reasonably explained by a model where a double-peak structure for the density of states near the Fermi energy is assumed. Based on a Korringa ratio analysis using the <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msub><mi>T</mi><mn>1</mn></msub></math> and <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mi>K</mi></math> data, ferromagnetic spin fluctuations are found to dominate in the ferromagnetic <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>Sr</mi><msub><mrow><mo>(</mo><msub><mi>Co</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Ni</mi><mi>x</mi></msub><mo>)</mo></mrow><mn>2</mn></msub><msub><mi mathvariant=\\\"normal\\\">P</mi><mn>2</mn></msub></mrow></math> as well as the antiferromagnets where no clear antiferromagnetic fluctuations are observed. 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引用次数: 0
摘要
众所周知,具有四方结构的 SrCo2P2 是一种斯通纳增强型保利顺磁金属,几乎具有铁磁性。最近,J. Schmidt 等人[Phys. Rev. B 108, 174415 (2023)]报告说,Sr(Co1-xNix)2P2 中用少量镍取代 x=0.02 的钴,实际上会诱发铁磁有序态,而进一步用 x=0.06-0.35 的镍取代钴,还会出现反铁磁有序相。在此,我们利用对 P31 原子核的核磁共振(NMR)测量,从微观角度研究了 Sr(Co1-xNix)2P2 中 Ni 的替代如何改变磁性能,尤其是关注了磁波动随 Ni 替代的演变以及磁有序态的特征。通过假定费米能附近的态密度具有双峰结构的模型,可以合理地解释 SrCo2P2 的 P31 自旋晶格弛豫速率除以温度(1/T1T)和奈特位移(K)的温度依赖性。根据使用 T1 和 K 数据进行的 Korringa 比率分析,我们发现铁磁性的 Sr(Co1-xNix)2P2 和反铁磁性的 Sr(Co1-xNix)2P2,铁磁性自旋波动占主导地位,而反铁磁性的 Sr(Co1-xNix)2P2,则没有观察到明显的反铁磁性波动。通过分析 P31-NMR 光谱,我们还发现在磁有序态中有序 Co 矩的分布呈现出特征性的矩形。
Inhomogeneous magnetic ordered state and evolution of magnetic fluctuations in Sr(Co1−xNix)2P2 revealed by P31 NMR
with a tetragonal structure is known to be a Stoner-enhanced Pauli paramagnetic metal being nearly ferromagnetic. Recently J. Schmidt et al. [Phys. Rev. B108, 174415 (2023)] reported that a ferromagnetic ordered state is actually induced by a small Ni substitution for Co of in where an antiferromagnetic ordered phase also appears by further Ni substitution with . Here, using nuclear magnetic resonance (NMR) measurements on nuclei, we have investigated how the magnetic properties change by the Ni substitution in from a microscopic point of view, especially focusing on the evolution of magnetic fluctuations with the Ni substitution and the characterization of the magnetically ordered states. The temperature dependencies of the spin-lattice relaxation rate divided by temperature and Knight shift for are reasonably explained by a model where a double-peak structure for the density of states near the Fermi energy is assumed. Based on a Korringa ratio analysis using the and data, ferromagnetic spin fluctuations are found to dominate in the ferromagnetic as well as the antiferromagnets where no clear antiferromagnetic fluctuations are observed. We also found the distribution of the ordered Co moments in the magnetically ordered states from the analysis of the -NMR spectra exhibiting a characteristic rectangular-like shape.
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