I. A. Nikitchenkov, A. D. Ilina, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, S. A. Kuzmichev, T. E. Kuzmicheva
{"title":"超掺杂微晶BaFe1.88Ni0.12As2在超导和正常状态下的隧穿光谱","authors":"I. A. Nikitchenkov, A. D. Ilina, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, S. A. Kuzmichev, T. E. Kuzmicheva","doi":"10.55959/msu0579-9392.78.2340501","DOIUrl":null,"url":null,"abstract":"Using tunneling spectroscopy, we measured current-voltage characteristics (CVC) and dynamic conductance spectra 𝑑𝐼(𝑉 )/𝑑𝑉 of tunneling contacts in single crystals of slightly overdoped superconducting ferro-pnictide of nominal composition BaFe1.88Ni0.12As2 with bulk critical temperature 𝑇𝑐 = 16−18 K. Besides the Andreev structure, a strong nonlinearity is observed in the obtained curves both in the superconducting and normal state. For the temperature range 4.3 − 26.4 K we determined the positions and temperature dependences of the observed features irrelated to the superconducting state. Additionally, we discuss the possible origins for the appearance of the observed features.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"161 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state\",\"authors\":\"I. A. Nikitchenkov, A. D. Ilina, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, S. A. Kuzmichev, T. E. Kuzmicheva\",\"doi\":\"10.55959/msu0579-9392.78.2340501\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Using tunneling spectroscopy, we measured current-voltage characteristics (CVC) and dynamic conductance spectra 𝑑𝐼(𝑉 )/𝑑𝑉 of tunneling contacts in single crystals of slightly overdoped superconducting ferro-pnictide of nominal composition BaFe1.88Ni0.12As2 with bulk critical temperature 𝑇𝑐 = 16−18 K. Besides the Andreev structure, a strong nonlinearity is observed in the obtained curves both in the superconducting and normal state. For the temperature range 4.3 − 26.4 K we determined the positions and temperature dependences of the observed features irrelated to the superconducting state. Additionally, we discuss the possible origins for the appearance of the observed features.\",\"PeriodicalId\":484854,\"journal\":{\"name\":\"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya\",\"volume\":\"161 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-09-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.55959/msu0579-9392.78.2340501\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.55959/msu0579-9392.78.2340501","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state
Using tunneling spectroscopy, we measured current-voltage characteristics (CVC) and dynamic conductance spectra 𝑑𝐼(𝑉 )/𝑑𝑉 of tunneling contacts in single crystals of slightly overdoped superconducting ferro-pnictide of nominal composition BaFe1.88Ni0.12As2 with bulk critical temperature 𝑇𝑐 = 16−18 K. Besides the Andreev structure, a strong nonlinearity is observed in the obtained curves both in the superconducting and normal state. For the temperature range 4.3 − 26.4 K we determined the positions and temperature dependences of the observed features irrelated to the superconducting state. Additionally, we discuss the possible origins for the appearance of the observed features.