Origin, Symmetry and Elastic Tuneability of Charge Density Waves in the Superconductor BaNi2(As P )2

This book plays a crucial role in unveiling the complex interplay between incommensurate and commensurate CDWs and superconductivity in these systems. Charge density waves (CDWs) are a fascinating electronic order observed in numerous quantum materials, often in close proximity to superconducting phases. Their significance has only grown since their discovery in cuprate superconductors and, more recently, in kagome superconductors. Mr. Lacmann's Ph.D. research has made groundbreaking contributions to this field by investigating materials derived from BaNiAsa non-magnetic analogue of the parent compounds of iron-based superconductors. This book presents an impressive array of synchrotron-based experimental results, shedding light on (i) the unconventional nature and origin of CDWs in BaNi(AsP), (ii) their symmetry, and (iii) the influence of hydrostatic and uniaxial pressure on these electronic phases. The innovative methodologies have been widely adopted, significantly impacting the field. With nine co-authored publicationsincluding two in nature communications and two in physical review lettersand two more in advanced preparation, his contributions are truly exceptional. Mr. Lacmann's outstanding achievements and lasting impact make him highly deserving of this award.

Nominated as an outstanding thesis by the Karlsruhe Institute of Technology Presents groundbreaking findings of superconductivity and CDWs in doped BaNiAs Sheds light on the unconventional nature of CDWs, their symmetry, and the influence of pressure

Autorentext

Tom Lacmann received his B.Sc. in physics from Ulm University in 2018. He then continued his studies at the Karlsruhe Institute of Technology, where he received his M.Sc. in 2020 and his Ph.D. in 2024. The research during his master's and doctoral studies was conducted at the Institute for Quantum Materials and Technologies. The main focus of his research is the investigation of charge density waves in quantum materials by various elastic and inelastic X-ray scattering and diffraction techniques, often using the capabilities of large-scale synchrotron radiation facilities. An additional emphasis of his research is the tuning of electronic phases in quantum materials using hydrostatic and uniaxial pressure.

Inhalt

Introduction.- Introduction to BaNi2As2.- Physical basics.- Origin of the charge density waves.- Symmetry of the charge density waves.- Pressure tuning of the charge density waves.- Conclusion and outlook.