Nao Furukawa, Qing-Ping Ding, Juan Schmidt, Sergey L. Bud'ko, Paul C. Canfield, Yuji Furukawa
{"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. 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":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review B","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevb.110.014439","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
Abstract
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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