F. Lyzwa, A. Chan, K. Fürsich, B. Keimer, C. Faugeras, Yu. G. Pashkevich, C. Bernhard, M. Minola, B. P. P. Mallett
{"title":"利用拉曼光谱探测铜绿石/锰矿异质结构中的界面和单个层","authors":"F. Lyzwa, A. Chan, K. Fürsich, B. Keimer, C. Faugeras, Yu. G. Pashkevich, C. Bernhard, M. Minola, B. P. P. Mallett","doi":"10.1103/physrevmaterials.8.074804","DOIUrl":null,"url":null,"abstract":"We report a comprehensive set of polarized Raman spectra on thin-film multilayers of the high-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mi>c</mi></msub></math> superconductor <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mrow><mi>YBa</mi></mrow><mn>2</mn></msub><msub><mrow><mi>Cu</mi></mrow><mn>3</mn></msub><msub><mrow><mi mathvariant=\"normal\">O</mi></mrow><mn>7</mn></msub></math> and electrically insulating manganites <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>R</mi><msub><mi>MnO</mi><mn>3</mn></msub></mrow></math> (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>R</mi><mo>=</mo></mrow></math> rare-earth partially substituted with group-II elements) hosting magnetic, charge and orbital order (COO). Such multilayers have been shown to exhibit a unique insulating-to-superconducting transition that is induced by magnetic field, electric field, or by tailoring the chemical composition of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> site of the manganite. The Raman spectra show significant Jahn-Teller distortions of the manganite structure, which correlate with COO, approximately 90 K above the magnetic ordering temperature of 140 K. Based on the Raman data and earlier electrical transport studies of single-layer manganite films, we argue that the manganite layers in our heterostructures remain electrically insulating across the range of investigated temperatures, dopings, and magnetic fields. The Raman spectra show a pronounced redshift and broadening of lattice vibrations around 200 <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> in the multilayers compared to those of manganite films, which may indicate hybridization with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mrow><mi>YBa</mi></mrow><mn>2</mn></msub><msub><mrow><mi>Cu</mi></mrow><mn>3</mn></msub><msub><mrow><mi mathvariant=\"normal\">O</mi></mrow><mn>7</mn></msub></math> phonons. We also observe additional excitations at 690 <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> and 830 <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> that are absent in the single films or bulk responses, which we discuss to originate from the cuprate/manganite interface. These observations demonstrate that the phonon spectrum is significantly modified in our multilayer samples. This is expected to play an important role in the mechanism of the insulating-to-superconducting transition found in these cuprate-manganite multilayers.","PeriodicalId":20545,"journal":{"name":"Physical Review Materials","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Probing the interface and individual layers in cuprate/manganite heterostructures by Raman spectroscopy\",\"authors\":\"F. Lyzwa, A. Chan, K. Fürsich, B. Keimer, C. Faugeras, Yu. G. Pashkevich, C. Bernhard, M. Minola, B. P. P. Mallett\",\"doi\":\"10.1103/physrevmaterials.8.074804\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report a comprehensive set of polarized Raman spectra on thin-film multilayers of the high-<math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msub><mi>T</mi><mi>c</mi></msub></math> superconductor <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msub><mrow><mi>YBa</mi></mrow><mn>2</mn></msub><msub><mrow><mi>Cu</mi></mrow><mn>3</mn></msub><msub><mrow><mi mathvariant=\\\"normal\\\">O</mi></mrow><mn>7</mn></msub></math> and electrically insulating manganites <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>R</mi><msub><mi>MnO</mi><mn>3</mn></msub></mrow></math> (<math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mrow><mi>R</mi><mo>=</mo></mrow></math> rare-earth partially substituted with group-II elements) hosting magnetic, charge and orbital order (COO). Such multilayers have been shown to exhibit a unique insulating-to-superconducting transition that is induced by magnetic field, electric field, or by tailoring the chemical composition of the <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><mi>R</mi></math> site of the manganite. The Raman spectra show significant Jahn-Teller distortions of the manganite structure, which correlate with COO, approximately 90 K above the magnetic ordering temperature of 140 K. Based on the Raman data and earlier electrical transport studies of single-layer manganite films, we argue that the manganite layers in our heterostructures remain electrically insulating across the range of investigated temperatures, dopings, and magnetic fields. The Raman spectra show a pronounced redshift and broadening of lattice vibrations around 200 <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> in the multilayers compared to those of manganite films, which may indicate hybridization with <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msub><mrow><mi>YBa</mi></mrow><mn>2</mn></msub><msub><mrow><mi>Cu</mi></mrow><mn>3</mn></msub><msub><mrow><mi mathvariant=\\\"normal\\\">O</mi></mrow><mn>7</mn></msub></math> phonons. We also observe additional excitations at 690 <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> and 830 <math xmlns=\\\"http://www.w3.org/1998/Math/MathML\\\"><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> that are absent in the single films or bulk responses, which we discuss to originate from the cuprate/manganite interface. These observations demonstrate that the phonon spectrum is significantly modified in our multilayer samples. This is expected to play an important role in the mechanism of the insulating-to-superconducting transition found in these cuprate-manganite multilayers.\",\"PeriodicalId\":20545,\"journal\":{\"name\":\"Physical Review Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2024-07-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physical Review Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1103/physrevmaterials.8.074804\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1103/physrevmaterials.8.074804","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Probing the interface and individual layers in cuprate/manganite heterostructures by Raman spectroscopy
We report a comprehensive set of polarized Raman spectra on thin-film multilayers of the high- superconductor and electrically insulating manganites ( rare-earth partially substituted with group-II elements) hosting magnetic, charge and orbital order (COO). Such multilayers have been shown to exhibit a unique insulating-to-superconducting transition that is induced by magnetic field, electric field, or by tailoring the chemical composition of the site of the manganite. The Raman spectra show significant Jahn-Teller distortions of the manganite structure, which correlate with COO, approximately 90 K above the magnetic ordering temperature of 140 K. Based on the Raman data and earlier electrical transport studies of single-layer manganite films, we argue that the manganite layers in our heterostructures remain electrically insulating across the range of investigated temperatures, dopings, and magnetic fields. The Raman spectra show a pronounced redshift and broadening of lattice vibrations around 200 in the multilayers compared to those of manganite films, which may indicate hybridization with phonons. We also observe additional excitations at 690 and 830 that are absent in the single films or bulk responses, which we discuss to originate from the cuprate/manganite interface. These observations demonstrate that the phonon spectrum is significantly modified in our multilayer samples. This is expected to play an important role in the mechanism of the insulating-to-superconducting transition found in these cuprate-manganite multilayers.
期刊介绍:
Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.