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- Radu Coldea, David A Tennant, +6 authors Klaus Kiefer
- Science
- 2010
Quantum phase transitions take place between distinct phases of matter at zero temperature. Near the transition point, exotic quantum symmetries can emerge that govern the excitation spectrum of the… (More)
- Seung-Hun Lee, Hideaki Kikuchi, +4 authors Klaus Kiefer
- Nature materials
- 2007
A three-dimensional system of interacting spins typically develops static long-range order when it is cooled. If the spins are quantum (S=1/2), however, novel quantum paramagnetic states may appear.… (More)
- Donald P. Morris, David A Tennant, +11 authors Robin S. Perry
- Science
- 2009
Sources of magnetic fields-magnetic monopoles-have so far proven elusive as elementary particles. Condensed-matter physicists have recently proposed several scenarios of emergent quasiparticles… (More)
- Suresh Singh, Nelia Wanderka, Klaus Kiefer, Konrad Siemensmeyer, John Banhart
- Ultramicroscopy
- 2011
Splat-quenched, as-cast and aged (2h at 600 °C after casting) AlCoCrCuFeNi high entropy alloys were investigated by means of transmission electron microscopy and three-dimensional atom probe (3D-AP).… (More)
- Conradin Kraemer, Neda Nikseresht, +14 authors Henrik M. Rønnow
- Science
- 2012
Magnetism has been predicted to occur in systems in which dipolar interactions dominate exchange. We present neutron scattering, specific heat, and magnetic susceptibility data for LiErF(4),… (More)
- Seamus Ward, Pierre Bouillot, +5 authors Thierry Giamarchi
- Journal of physics. Condensed matter : an…
- 2013
Magnetic insulators have proven to be usable as quantum simulators for itinerant interacting quantum systems. In particular the compound (C(5)H(12)N)(2)CuBr(4) (for short: (Hpip)(2)CuBr(4)) was shown… (More)
- Andreas Klee, Sylvain F Prévost, Werner Kunz, Ralf Schweins, Klaus Kiefer, Michael Gradzielski
- Physical chemistry chemical physics : PCCP
- 2012
Microemulsions with magnetic properties were formed by employing a magnetic room temperature ionic liquid (MRTIL) as polar phase, cyclohexane as oil, and an appropriate mixture of ionic surfactant… (More)
- Ch Rüegg, Klaus Kiefer, +11 authors Karl W Krämer
- Physical review letters
- 2008
The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect.… (More)
- J. S. Kim, Sungdae Ji, +7 authors Klaus Kiefer
- Physical review letters
- 2008
We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field H on the weakly coupled distorted kagome system, Cu2(OD)3Cl. Our results show… (More)