While Jacob has been at CHESS as a Staff Scientist since 2012, he is excited to be transferring to his new directorship. We asked him a few questions about his career so far and his hopes for the future of CHEXS.
Could you share a bit about your background and interests?
I studied physics as a student, first as an undergraduate at the University of Waterloo, and later as a graduate student at McMaster University, both in Canada (where I grew up). In my final year at Waterloo, I started to be interested in the statistical and quantum properties of materials. Specifically, I wanted to understand how large numbers of electrons and atoms compete and cooperate to form different kinds of ordered states, and how these states imbue materials with different unique properties. As a graduate student I became a user of large scattering facilities (both neutron and x-ray), which let me observe these ordered states with a high level of precision. Later, I moved to the USA to join Argonne National Lab as a postdoc, working on understanding the evolution of these states in high magnetic fields. After a few years at Argonne, I moved to Cornell to join the permanent staff at CHESS, and I have been working with users on CHESS x-ray beamlines for the past 8 years.
What are you most proud of in your previous work at CHESS?
Mostly I’m proud of the broad collaborations I’ve been able to have, and particularly the students and postdocs I’ve been able to help, teach, and train. The best experience is watching early career scientists develop into world-leading thinkers - that is a real privilege and perk of the job of a beamline scientist. I’m also proud of the x-ray instruments and techniques I’ve been able to help develop, including the newly commissioned QM2 Beamline dedicated to quantum materials research, which is part of CHEXS.
What are you most excited about becoming the director of CHEXS?
CHEXS is the home of fundamental, curiosity-driven science at CHESS. This is the part of the lab that supports the broader research community, making the instruments accessible to all researchers in many different disciplines. CHEXS has direct impact training students and postdocs to be future leaders in synchrotron x-ray technology. I’m excited about the opportunity to work across disciplines with the outstanding team of CHEXS scientists, to take full advantage of the new CHESS-U x-ray beams and cutting edge instrumentation. I’m also excited to help shepherd new initiatives, like the recently announced High Magnetic Field beamline which we will be building over the next few years.
Jacob's Biographical Information
Quantum physics of materials, disordered structures, diffuse scattering, REXS, magnetism, unconventional superconductivity, charge density waves, critical phenomena, phonons, spin waves, single crystals, thin films, low temperatures, large magnetic fields.
Charge Density Wave in the New Polymorphs of RE2Ru3Ge5 (RE=Pr,Sm,Dy), Daniel E Bugaris, Christos D Malliakas, Fei Han, Nicholas P Calta, Mihai Sturza, Matthew J Krogstad, Raymond Osborn, Stephan Rosenkranz, Jacob PC Ruff, Giancarlo Trimarchi, Sergey L Bud’ko, Mahalingam Balasubramanian, Duck Young Chung, and Mercouri G Kanatzidis, JACS 139 (11), pp 4130-4143 (2017) https://doi.org/10.1021/jacs.7b00284
Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2, Anshul Kogar, Gilberto A de la Pena, Sangjun Lee, Yizhi Fang, SX-L Sun, David B Lioi, Goran Karapetrov, Kenneth D Finkelstein, Jacob PC Ruff, Peter Abbamonte, and Stephan Rosenkranz, Physical Review Letters 118, 027002 (2017) https://doi.org/10.1103/PhysRevLett.118.027002
Interplay of spin-orbit interactions, dimensionality, and octahedral rotations in semimetallic SrIrO3, YF Nie, PDC King, CH Kim, M Uchida, HI Wei, BD Faeth, JP Ruf, JPC Ruff, L Xie, X Pan, CJ Fennie, DG Schlom, and KM Shen, Physical Review Letters 114, 016401 (2015) https://doi.org/10.1103/PhysRevLett.114.016401
Susceptibility anisotropy in an iron arsenide superconductor revealed by x-ray diffraction in pulsed magnetic fields, JPC Ruff, J-H Chu, H-H Kuo, RK Das, H Nojiri, IR Fisher, and Z Islam, Physical Review Letters 109, 027004 (2012) https://doi.org/10.1103/PhysRevLett.109.027004
Full publication list on Google Scholar (link): https://scholar.google.com/citations?user=0XN9swkAAAAJ&hl=en