Preparation and Peculiar Magnetic Properties at Low Temperatures of La1.85Sr0.15CuO4 Nanofibers

Shi-Long Gao; Ting-Ting Zhang; Li-Peng Qiu; Yu-Rui Zhang; Guo-Ting Cheng; Qi Liu; Wen-Peng Han; Seeram Ramakrishna; Yun-Ze Long

doi:10.3390/nano14040361

Preparation and Peculiar Magnetic Properties at Low Temperatures of La_1.85Sr_0.15CuO₄ Nanofibers

Nanomaterials (Basel). 2024 Feb 15;14(4):361. doi: 10.3390/nano14040361.

Authors

Shi-Long Gao¹, Ting-Ting Zhang¹, Li-Peng Qiu¹, Yu-Rui Zhang¹, Guo-Ting Cheng², Qi Liu¹, Wen-Peng Han¹, Seeram Ramakrishna³, Yun-Ze Long¹

Affiliations

¹ Collaborative Innovation Center for Nanomaterials & Devices, Innovation Institute for Advanced Nanofibers, College of Physics, Qingdao University, Qingdao 266071, China.
² Department of Electrical and Computer Engineering, Herbert Wertheim College of Engineering, University of Florida, Gainesville, FL 32608, USA.
³ Center for Nanotechnology & Sustainability, Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, Singapore 117574, Singapore.

Abstract

Herein, the preparation process, morphology, structure, and magnetic properties of La_1.85Sr_0.15CuO₄ (LSCO) cobweb-like nanofibers are reported. LSCO nanofibers with a regular grain size distribution are successfully prepared via electrospinning, followed by calcination. We conducted morphology analysis and elemental distribution using electron microscopy and energy-dispersive X-ray spectroscopy (EDS), respectively. Additionally, magnetic property testing was performed using a vibrating sample magnetometer (VSM) to confirm the superconducting properties of the samples. Interestingly, our samples exhibited a superconducting transition temperature, Tc, of 25.21 K, which showed some disparity compared to similar works. Furthermore, we observed a ferromagnetic response at low temperatures in the superconducting nanofibers. We attribute these phenomena to the effects generated by surface states of nanoscale superconducting materials.

Keywords: La1.85Sr0.15CuO4; electrospinning; ferromagnetism; nanofibers; superconducting.

Grants and funding

This work was supported by the National Natural Science Foundation of China (52273077) and the State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University (RZ2000003334 and ZDKT202108).