Dr. Marc Janoschek

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI
Switzerland

Since 2018 Head of the Laboratory for Neutron and Muon Instrumentation (LIN) at Paul Scherrer Institut, Switzerland.
Since 2016 Co-leader (with Prof. Christian Pfleiderer) of the focus group Quantum Matter at the Institute for Advanced Study at Technische Universität München (TUM-IAS) as a Hans-Fischer fellow.
2011-2018 Staff Scientist at Condensed Matter & Magnet Science (MPA-CMMS), Los Alamos National Laboratory, Los Alamos, NM, USA (Capability Leader for Neutron Scattering).
2009-2011 Feodor-Lynen Postdoctoral Fellow at the University of California, San Diego, Prof. M. Brian Maple's group.
2009-2011 Postdoc Universität zu Köln, Prof. Markus Braden's group, design of the new polarized tree-axis spectrometer KOMPASS at FRM II.
2005-2008 Research Assistant at Paul Scherrer Institut, Villigen-PSI, Switzerland and Technische Universität München, Germany.
2003-2004 Undergraduate Research Assistant at Institute Laue Langevin, Grenoble, France.

My research program is centered on genuine quantum phenomena in bulk materials. I am particularly interested in understanding how tuning of the underlying atomic-scale interactions via external control parameters (pressure, field, strain, crystal chemistry) may be used to understand and optimize the properties of quantum materials that are of interest for future applications. To pursue this vision, my research closely integrates the making of materials, development and design of novel instrumentation, state-of-the-art experiments and modelling. For the latter, I rely on an international network of theorists. My key expertise is the quantitative determination of atomic-scale properties of quantum matter phases by means of x-ray and neutron scattering methods at extreme conditions as well as in the design of neutron instrumentation.

Current topics of interest:
  • Quantum matter near magnetic instabilities in metals.
  • Strongly correlated electron materials.
  • Emergence of novel states of matter such as nematic states.
  • Magnetic frustration in metallic quantum states
  • Interplay of structural, electronic and magnetic degrees of freedom.
  • Complex and topological magnetic phases and their excitations.
  • Neutron scattering instrumentation.

Expertise:
  • Neutron diffraction and spectroscopy, including measurements at extreme conditions (low temperature, high magnetic field, pressure and strain).
  • Design of advanced neutron instrumentation.
  • Design of ancillary equipment for scattering methods.
  • Laboratory and synchrotron x-ray methods: powder/single crystal diffraction, x-ray magnetic circular dichroism (XMCD), resonant elastic/inelastic x-ray scattering.
  • Bulk measurement techniques: electrical transport, magnetic susceptibility, specific heat and thermopower.
  • Synthesis of large (suitable for neutron scattering), high-quality single crystals.

Examples:
Using the Modulated IntEnsity by Zero Effort (MIEZE) method that offers ultra-high energy resolution (approx. 1 micro eV), we reveal a dual character of the spin fluctuations in UGe2 that is consistent with spin-triplet superconductivity; Phys. Rev. B 99, 014429 (2019).
Our neutron spectroscopy measurements in CeRhIn5 suggest intimate coupling between magnetic and electronic degrees of freedom that is likely related to a fluctuating nematic state found at high magnetic fields; Nature Physics 14, 456–460 (2018).
Strain cell developed for Small Angle Neutron Scattering is shown; Appl. Phys. Lett. 110, 192409 (2017).

Ultrahigh-resolution neutron spectroscopy of low-energy spin dynamics in UGe2
F. Haslbeck, S. Säubert, M. Seifert, C. Franz, M. Schulz, A. Heinemann, T. Keller, Pinaki Das, J. D. Thompson, E. D. Bauer, C. Pfleiderer, and M. Janoschek
Phys. Rev. B99, 014429 (2019).

Anisotropic magneto-crystalline coupling of the skyrmion lattice in MnSi
Yongkang Luo, Shi-Zeng Lin, D. M. Fobes, Zhiqi Liu, E. D. Bauer, J. B. Betts, A. Migliori, J. D. Thompson, M. Janoschek, B. Maiorov
Phys. Rev. B97, 104423 (2018).

Tunable Emergent Heterostructures in a Prototypical Correlated Metal
D. M. Fobes, S. Zhang, S.-Z. Lin, Pinaki Das, N. J. Ghimire, E. D. Bauer, J. D. Thomson, L. W. Harriger, G. Ehlers, A. Podlesnyak, R. I. Bewley, A. Sazonov, V. Hutanu, F. Ronning, C. D. Batista, M. Janoschek
Nature Physics14, 456–460 (2018).

Versatile Strain-Tuning of Modulated Long-Period Magnetic Structures
D. M. Fobes, Yongkang Luo, N. Leon-Brito, E. D. Bauer, V. R. Fanelli, M. A. Taylor, L. M. Debeer-Schmitt, M. Janoschek
Appl. Phys. Lett.110, 192409 (2017).

Relevance of Kondo physics for the temperature dependence of the bulk modulus in plutonium
M. Janoschek, G. Lander, J. M. Lawrence, E. D. Bauer, J. C. Lashley, M. Lumsden, D. L. Abernathy, and J. D. Thompson
PNAS114, E268 (2017).

Quantum critical scaling in the disordered itinerant ferromagnet UCo1-xFexGe
K. Huang, S. Eley, P. F. S. Rosa, L. Civale, E. D. Bauer, R. E. Baumbach, M. B. Maple, and M. Janoschek
Phys. Rev. Lett.117, 237202 (2016).

Oxygen Vacancy-Driven Evolution of Structural and Electrical Properties in SrFeO3-δ Thin Films and a Method of Stabilization
E. Enriquez, A. Chen, Z. Harrell, X. Lu, P. C. Dowden, N. A. Koskelo, M. Janoschek, C. Chen, and Q. Jia
_Appl. Phys. Lett. 109, 141906 (2016).

Electronic correlation and magnetism in the ferromagnetic metal Fe3GeTe2
Jian-Xin Zhu, M. Janoschek, D. S. Chaves, J. C. Cezar, T. Durakiewicz, F. Ronning,Y. Sassa, M. Mansson, B. L. Scott, N. Wakeham, Eric D. Bauer, and J. D. Thompson
Phys. Rev. B93, 144404 (2016)

Band structure of helimagnons in MnSi resolved by inelastic neutron scattering
M. Kugler, G. Brandl, R. Georgii, K. Seemann, M. Janoschek, J. Waizner, M. Garst, A. Rosch, C. Pfleiderer, and P. Böni.
Phys. Rev. Lett.115, 097203 (2015).

The Valence-Fluctuating Ground State of Plutonium
M. Janoschek, Pinaki Das, B. Chakrabarti, D. L. Abernathy, M. D. Lumsden, J. M. Lawrence, J. D. Thompson, G. H. Lander, J. N. Mitchell, S. Richmond, M. Ramos, F. Trouw, J.-X. Zhu, K. Haule, G. Kotliar, E. D. Bauer
Science Advances1, e1500188 (2015).

Symmetry and correlations underlying hidden order in URu2Si2
N. P. Butch, M. E. Manley, J. R. Jeffries, M. Janoschek, K. Huang, M. B. Maple, A. H. Said, B. M. Leu, and J. W. Lynn
Phys. Rev. B91, 035128 (2015).

Magnitude of the magnetic exchange interaction in the heavy-fermion antiferromagnet CeRhIn5
Pinaki Das, S.-Z. Lin, N. J. Ghimire, K. Huang, F. Ronning, E. D. Bauer, J. D. Thompson, C. D. Batista, G. Ehlers, and M. Janoschek
Phys. Rev. Lett.113, 246403 (2014).

Correlated approach to magnetocrystalline anisotropy of strong magnets
J.-X. Zhu, M. Janoschek, F. Ronning, J. D. Thompson, M. A. Torrez, E. D. Bauer, and C. D. Batista
Phys. Rev. X4, 021027 (2014).

Absence of a static in-plane magnetic moment in the hidden-order phase of URu2Si2
P. Das, R. E. Baumbach, K. Huang, M. B. Maple, Y. Zhao, J. S. Helton, J. W. Lynn, E. D. Bauer, and M. Janoschek
New J. Phys.15, 053031 (2013).

Non-Fermi liquid regimes with and without quantum criticality in Ce1-xYbxCoIn5
T. Hu, Y. P. Singh, L. Shu, M. Janoschek, M. Dzero, M. B. Maple, and C. C. Almasan
PNAS110, 7160 (2013).

Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
M. Janoschek, M. Garst, A. Bauer, P. Krautscheid, R. Georgii, P. Boni, and C. Pfleiderer
Phys. Rev B87, 134407 (2013).

Twofold enhancement of the hidden-order/large-moment antiferromagnetic phase boundary in the URu2-xFexSi2 system
N. Kanchanavatee, M. Janoschek, R. E. Baumbach, J. J. Hamlin, D. A. Zocco, K. Huang and M. B. Maple
Phys. Rev. B84, 245122 (2011).

Correlated electron state in Ce1-xYbxCoIn5 stabilized by cooperative valence fluctuations
L. Shu, R. E. Baumbach, M. Janoschek, E. Gonzales, K. Huang, T. A. Sayles, J. Paglione, J. O’Brien, J. J. Hamlin, D. A. Zocco, P.-C. Ho, C. A. McElroy, and M. B. Maple
Phys. Rev. Lett.106, 156403 (2011).

Non-Fermi Liquid Regimes and Superconductivity in the Low-Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials
M. B. Maple, R. E. Baumbach, N. P. Butch, J. J. Hamlin and M. Janoschek
J. Low. Temp. Phys.161, 4-54 (2010).

Helimagnon bands as universal excitations of chiral magnets
M. Janoschek, F. Bernlochner, S. Dunsiger, C. Pfleiderer, P. Böni, B. Roessli, P. Link, A. Rosch
Phys. Rev. B81, 214436 (2010).

Single magnetic chirality in the magneto-electric NdFe3(11BO3)4
M. Janoschek, P. Fischer, J. Schefer, B. Roessli, V. Pomjakushin, M. Meven, V. Petricek, G. Petrakovskii, L. Bezmaternikh
Phys. Rev. B81, 094429 (2010).

Optimisation of elliptic neutron guides for triple-axis spectroscopy
M. Janoschek, P. Böni, M. Braden
Nucl. Instrum. Methods Phys. Res., Sect. A613, 119 (2010).

Manipulating the magnetic structure by electric fields in multiferroic ErMn2O5
Y. Bodenthin, U. Staub, M. Garcia-Fernandez, M. Janoschek, J. Schlappa, E. I. Golovenchits, V. A. Sanina, and S. G. Lushnikov
Phys. Rev. Lett.100, 027201 (2008).

Spherical neutron polarimetry with MuPADM. Janoschek, S. Klimko, R. Gähler, B. Roessli and P. Böni
Physica B397(1), 125-130 (2007),
2017 LANL LDRD Exploratory Research funding (total funding: ~1M$, Oct 2017-Sep 2020).
2016 Los Alamos National Laboratory Fellows Prize for Research.
2016 Hans Fischer Fellow at the Institute for Advanced Study at Technische Universität München (TUM-IAS).
2015 Los Alamos National Laboratory Small Team Distinguished Performance Award for discovering the elusive magnetism in plutonium metal.
2014 LANL LDRD Directed Research funding for performing work (total funding: ~5M$, Oct 2014-Sep 2017).
2014 Wolfram-Prandl Award for “pioneering studies of the spin dynamics in chiral helimagnets and the development of a cryogen-free apparatus for spherical neutron polarimetry”.
2011 LANL LDRD Early-career research funding (total funding: 500k$, Oct 2011-Sep 2013).
2009 Feodor Lynen Fellow of the Alexander v. Humboldt foundation.
2004 Scholarship, German Academic Exchange Service (DAAD).
2003 Scholarship, Centre de Coopération Universitaire Franco-Bavarois.
2002 Scholarship, Office Franco-Allemand pour la Jeunesse.
2019 23rd meeting of the International Collaboration on Advanced Neutron Sources (ICANS XXIII) in Chattanooga, Tennessee, USA (Instrument sub-committee).
2018 American Conference on Neutron Scattering in College Park, MD, USA (Program Co-Chair for “hard Condensed matter” subtopic).
2017 "Skyrmionics: Materials, Phenomena and Applications” in Santa Fe, NM, USA.
2010 Workshop “Correlated Electron Physics in a New Lab and Unveiling of the New Quantum Design PPMS Dynacool,” at the University of California, San Diego (Chair of Organization Committee).
Since 2019

Lead of Working Group 3 ‘Synergies in Technological Development and Operation’ within the League of advanced European Neutron Sources (LENS).

Since 2019

Member representing PSI of the Instrument Collaboration Board (ICB), European Spallation Source, Lund, Sweden.

Since 2019 Member of UK-ESS Instrument Project Board.
Since 2018 Elected Member (Elected Vice Chair in 2018) of the Executive Committee of the SNS-HFIR User Group(SHUG) at Oak Ridge National Laboratory (ORNL).
2018 Member Internal Advisory Board of LANL’s Institute for Material Science (IMS).
Since 2017 Member Cold Neutron Multi-Analyzer Triple Axis spectrometer (MANTA) Advisory Board at ORNL.
2016-2018 Member LANL Seaborg Institute Advisory Board.
Since 2016 Member Young Investigator Advisory Board for ORNL’s Quantum Condensed Matter Division.
Since 2016 Member Zeemans Instrument Advisory Team (ZIAT) at ORNL
Since 2015 Reviewer Deutsche Forschungsgemeinschaft (DFG, German Research Foundation).
2015-2016 Co-Chair Defects and Interfaces Category of theLANL LDRDprogram.
2014-now Reviewer National Science Foundation (NSF).
Since 2013 Graduate Student Mentor within the Integrated Graduate School of the German Transregio Grant “TRR80: From Electronic Correlations to Functionality”.
Since 2013 Member Science Review Committee at ORNL.
Since 2013 Reviewer Neutron Scattering Instrumentation and Technique Development research program for Office of Basic Energy Sciences (BES) within the Department of Energy.
2012-2013 Member Advisory Committee for the Lujan Neutron Scattering Center at LANL(2012-13).