Magnetic order and competition with superconductivity in (Ho-Er)Ni2B2C.
Suleyman Gundogdu1, J Patrick Clancy2, Guangyong Xu3
1Physics Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey.
Materials Research Express
|September 18, 2023
Summary
We studied magnetic order in rare earth superconductors . Doping with Erbium (Er) creates complex magnetic structures that compete with superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism and Superconductivity
Background:
- Quaternary borocarbides (R = Ho, Er) are magnetic intermetallic superconductors.
- These materials exhibit superconducting transition temperatures around 10 K.
- Long-range magnetic order develops concurrently with superconductivity, leading to competition between these phenomena.
Purpose of the Study:
- To investigate the rare earth magnetic order in pure and doped single crystals.
- To understand how doping affects the interplay between magnetism and superconductivity.
- To explore the resulting magnetic phases and their characteristics.
Main Methods:
- Magnetization measurements were performed on single crystal samples.
- Neutron diffraction was employed to probe the magnetic structures.
- Analysis involved comparing experimental results with theoretical models like RKKY interactions.
Main Results:
- The coupling between superconductivity and magnetism results in various magnetic phases, dependent on rare earth composition.
- Phases range from near-reentrant superconductivity with mixed antiferromagnetism to incommensurate antiferromagnetic spin modulation with a weak ferromagnetic component.
- Doping Er onto Ho sites, which possess distinct magnetic moments and easy directions, induces complex magnetic modulations and potential local disorder.
Conclusions:
- The study reveals intricate magnetic ordering in systems.
- These magnetic phases coexist with superconductivity, highlighting a complex interplay.
- An induced magnetic state analogous to cuprates was observed.
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