Electronic, structural, and magnetic properties of single crystalline pnictides: Thermodynamic studies down to ultra-low temperatures

单晶磷族元素的电子、结构和磁性：超低温下的热力学研究

• 批准号: 237770550
• 负责人: Professor Dr. Christian Walter Dietrich Enss
• 金额: --
• 依托单位: Kirchhoff-Institut für Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237770550?language=en
• 关键词: Electronic; structural; magnetic; properties; single

We will apply thermodynamic and magnetic studies down to 10 mK in order to investigate the nature of superconductivity and the interplay of magnetism, structure, and electronic properties in Fe-based superconductors. For investigating superconductivity, we will perform measurements of the specific heat at very low temperatures 10 mK – 4 K in magnetic fields up to 9T by means of an existing calorimeter and a newly designed magnetic thermometry-based calorimeter which will be realized. The specific heat studies will be complemented by magnetic susceptibility and heat transport measurements in the same temperature regime. Both in-plane and out-of-plane doped materials will be addressed which are delivered by our SPP partners, i.e. single-crystalline K1- xNaxFe2As2, LiFeAs, K(Fe,M)2As2 and Na(Fe,M)As with M = Rh, Ru, Co,Ni Cr, Mn. In addition, the interplay of electronic, magnetic, and structural degrees of freedom will be studied by thermal expansion experiments at 2 – 300K. Here, in addition to Na(Fe,M)As, LaFeAsO single crystals and polycrystalline doping series RFeAsO1-xFx will be studied, with a particular focus on the tetragonal phase and nematic magnetic short-range order.

我们将应用热力学和磁学研究到10 mK，以研究超导的本质以及铁基超导体中磁性、结构和电子特性的相互作用。为了研究超导性，我们将利用现有的量热计和即将实现的新设计的基于磁测温仪的量热计，在高达9T的磁场中测量极低温10 mK - 4 K的比热。具体的热研究将由磁化率和热输运测量在相同的温度制度补充。平面内和平面外掺杂材料将由我们的SPP合作伙伴提供，即单晶K1- xNaxFe2As2， LiFeAs， K(Fe，M)2As2和Na(Fe，M)As,M = Rh, Ru, Co,Ni Cr, Mn。此外，电子、磁性和结构自由度的相互作用将通过2 - 300K的热膨胀实验进行研究。在这里，除了Na(Fe，M)As外，还将研究LaFeAsO单晶和多晶掺杂系列RFeAsO1-xFx，特别关注四方相和向列磁短程有序。

项目成果

Unusual magnetotransport properties in a FeAs single crystal

FeAs 单晶中不寻常的磁输运特性

• DOI: 10.1103/physrevb.93.205129
• 发表时间: 2016
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: S. Khim;M. Gillig;R. Klingeler;S. Wurmehl;B. Büchner;C. Hess
• 通讯作者: C. Hess

Specific Heat of K$$_{0.71}$$0.71Na$$_{0.29}$$0.29Fe$$_2$$2As$$_2$$2 at Very Low Temperatures

极低温度下 K$$_{0 71}$$0 71Na$$_{0 29}$$0 29Fe$$_2$$2As$$_2$$2 的比热

• DOI: 10.1007/s10909-014-1168-7
• 发表时间: 2014
• 期刊: Journal of Low Temperature Physics
• 影响因子: 2
• 作者: A. Reifenberger;M. Hempel;P. Vogt;S. Aswartham;M. Abdel-Hafiez;V. Grinenko;S. Wurmehl;S.-L. Drechsler;A. Fleischmann;C. Enss;R. Klingeler
• 通讯作者: R. Klingeler

Nematicity in LaFeAsO1−xFx

• DOI: 10.1002/pssb.201600214
• 发表时间: 2016-04
• 期刊: physica status solidi (b)
• 作者: C. Hess;C. Hess;H. Grafe;A. Kondrat;G. Lang;G. Lang;F. Hammerath;F. Hammerath;L. Wang;R. Klingeler;G. Behr;B. Büchner;B. Büchner

Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors.

• DOI: 10.1063/1.5139090
• 发表时间: 2020-03
• 期刊: The Review of scientific instruments
• 作者: A. Reifenberger;A. Reiser;S. Kempf;A. Fleischmann;C. Enss

Evidence of d-wave superconductivity in K1-xNaxFe2As2 (x=0,0.1) single crystals from low-temperature specific-heat measurements

• DOI: 10.1103/physrevb.87.180507
• 发表时间: 2013-01
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Mahmoud Abdel-Hafiez;Vadim Grinenko;S. Aswartham;I. Morozov;M. Roslova;O. Vakaliuk;Steven Johnston;D. Efremov;J. Brink;H. Rosner;Manoj Kumar;Christian Hess;S. Wurmehl;A. Wolter;B. Büchner;E. Green;J. Wosnitza;P. Vogt;A. Reifenberger;C. Enss;M. Hempel;R. Klingeler;S. Drechsler