Research area:
I am working on the theory of magnetic structures and excitations in
condensed matter systems with localized moments, i.e. primarily systems
containing ions from the series of the Lanthanides or the Actinides.
I have written a monograph on the subject in collaboration with Allan
Mackintosh:
Jens Jensen and Allan R. Mackintosh: Rare Earth Magnetism: Structures
and Excitations
published by Clarendon Press, Oxford, England in
1991.
Des McMorrow, Henrik Rønnow and I have edited the
proceedings of
Magnetism in Metals, a symposium in memory of Allan Mackintosh
(1936-95), Copenhagen, August 26-29, 1996 and published by The Royal
Danish Academy of Sciences and Letters in Matematisk-fysiske Meddelelser
45 (1997).
Recent
publications:
R. Toft-Petersen, T. B. S. Jensen, J. Jensen, M. v. Zimmermann, S. Sloth,
F. W. Isaksen, N. B. Christensen, Y. Chen, K. Siemensmeyer, H. Kawano-Furukawa, H. Takeya, A. B. Abrahamsen, and N. H. Andersen,
Magnetoelastic phase diagram of TbNi2B2C, Phys. Rev. B 97, 224417 (2018).
J. Jensen, J. Larsen, and U. B. Hansen,
Comprehensive cluster-theory analysis of the magnetic structures and
excitations in CoCl2·2H2O, Phys. Rev. B
97, 024423 (2018).
J. Larsen, T. K. Schäffer, U.
B. Hansen, S. L. Holm, S. R. Ahl, R. Toft-Petersen, J. Taylor, G. Ehlers, J. Jensen,
H. M. Rønnow, K. Lefmann, and N. B. Christensen,
Spin Excitations and Quantum Criticality in the Quasi One-Dimensional
Ising-Like Ferromagnet CoCl2·2D2O in a Transverse
Field, Phys. Rev. B
96, 174424 (2017).
R. Toft-Petersen, E. Fogh, T. Kihara, J. Jensen, K. Fritsch, J. Lee, G.
E. Granroth, M. B. Stone, D. Vaknin, H. Nojiri, and N. B. Christensen,
Field-induced reentrant magnetoelectric phase in LiNiPO4, Phys. Rev. B
95, 064421 (2017).
P. Babkevich,
N. Nikseresht, I. Kovacevic, J. O. Piatek, B. Dalla Piazza, C. Kraemer, K. W.
Krämer, K. Prokeš, S. Ma'taš, J. Jensen, and H. M. Rønnow,
Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4, Phys. Rev. B
94, 174443 (2016).
Recent
seminars:
Linear Response
Theory and the Random Phase Approximation (International workshop on
McPhase, Heinz Maier - Leibnitz Zentrum, Munich, 5.-7. November 2014).
Chiral spin-wave excitations of the spin-5/2 trimers in the
langasite compound
Ba3NbFe3Si2O14
(TEMM, Rutherford-Appleton Laboratory, Oxfordshire, June 2011).
Bose-Einstein
condensation - in the spin-dimer system TlCuCl3(?) (Niels Bohr Institute, Copenhagen, November 2009).
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