{"title":"高压氧气退火增强掺杂硒的 La3Ni2O7-δ 的导电性","authors":"Keke Jiao , Rui Niu , Huixin Xu , Weili Zhen , Jingrong Wang , Changjin Zhang","doi":"10.1016/j.physc.2024.1354504","DOIUrl":null,"url":null,"abstract":"<div><p>The structural, electrical and magnetic properties of a series of La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7-δ</sub> polycrystalline samples have been systematically investigated with and without high-pressure oxygen annealing. Without annealing, the introduction of Sr at La site leads to a moderate enhancement of conductivity. The high-pressure oxygen annealing leads to an increase of oxygen content by ∼1.08 %. Consequently, the conductivity of the annealing samples is significantly enhanced comparing to the untreated samples. The La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7-δ</sub> samples exhibit metal-like behavior in the whole temperature range with annealing, which is due to the hole doping effect. The present results could contribute to the exploration of possible ambient superconductivity in La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> system.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced conductivity in Sr doped La3Ni2O7-δ with high-pressure oxygen annealing\",\"authors\":\"Keke Jiao , Rui Niu , Huixin Xu , Weili Zhen , Jingrong Wang , Changjin Zhang\",\"doi\":\"10.1016/j.physc.2024.1354504\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The structural, electrical and magnetic properties of a series of La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7-δ</sub> polycrystalline samples have been systematically investigated with and without high-pressure oxygen annealing. Without annealing, the introduction of Sr at La site leads to a moderate enhancement of conductivity. The high-pressure oxygen annealing leads to an increase of oxygen content by ∼1.08 %. Consequently, the conductivity of the annealing samples is significantly enhanced comparing to the untreated samples. The La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7-δ</sub> samples exhibit metal-like behavior in the whole temperature range with annealing, which is due to the hole doping effect. The present results could contribute to the exploration of possible ambient superconductivity in La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> system.</p></div>\",\"PeriodicalId\":20159,\"journal\":{\"name\":\"Physica C-superconductivity and Its Applications\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2024-04-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physica C-superconductivity and Its Applications\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921453424000698\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"PHYSICS, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica C-superconductivity and Its Applications","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921453424000698","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
摘要
我们系统地研究了一系列 La3-xSrxNi2O7-δ 多晶样品在经过高压氧气退火和未经过高压氧气退火时的结构、电学和磁学特性。在不进行退火的情况下，在 La 位点引入 Sr 会适度增强导电性。高压氧气退火导致氧含量增加了 ∼ 1.08 %。因此，与未处理的样品相比，退火样品的电导率显著提高。退火后的 La3-xSrxNi2O7-δ 样品在整个温度范围内都表现出类似金属的行为，这是由于空穴掺杂效应。本研究结果有助于探索 La3Ni2O7-δ 体系中可能存在的环境超导性。
Enhanced conductivity in Sr doped La3Ni2O7-δ with high-pressure oxygen annealing
The structural, electrical and magnetic properties of a series of La3-xSrxNi2O7-δ polycrystalline samples have been systematically investigated with and without high-pressure oxygen annealing. Without annealing, the introduction of Sr at La site leads to a moderate enhancement of conductivity. The high-pressure oxygen annealing leads to an increase of oxygen content by ∼1.08 %. Consequently, the conductivity of the annealing samples is significantly enhanced comparing to the untreated samples. The La3-xSrxNi2O7-δ samples exhibit metal-like behavior in the whole temperature range with annealing, which is due to the hole doping effect. The present results could contribute to the exploration of possible ambient superconductivity in La3Ni2O7-δ system.
期刊介绍：
Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity.
The main goal of the journal is to publish:
1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods.
2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance.
3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices.
The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.
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