Oliver Portugall Laboratoire National des Champs Magnétiques Intenses (LNCMI) Toulouse & Grenoble, France

Transcription

1 Oliver Portugall Laboratoire National des Champs Magnétiques Intenses (LNCMI) Toulouse & Grenoble, France 1

2 Building & Infrastructure 2

3 3

4 Industrial building (steel panel construction) 6 explosion proof magnet cells 300 m² laboratory space 7 preparation rooms and workshops 2 assembly bays (generators, magnets) 4

5 Preparation rooms Magnet pits Technical infrastructure 5

6 6

7 New transportable generator 2 x 3 MJ (existing generator 14 MJ) 2 x 65 ka (existing generator 65 ka) Possibility to construct 90+ Tesla magnets Application with advanced light sources 7

8 Technical highlights 8

9 Signal-to-noise scales with (pulse duration) 1/2 Experimental complications (pick-up, eddy currents) ( B/ t) 2 9

10 90 Tesla in a double coil 8 77 K K 80 Tesla in a mono coil K K mk Signal-to-noise scales with (pulse duration) 1/2 Experimental complications (pick-up, eddy currents) ( B/ t) 2 10

11 Scientific highlights 11

12 LNCMI Grenoble LNCMI Toulouse 100 IF < 5 5 < IF < 15 IF > IF < 5 5 < IF < 15 IF > 15 Publications Publications Year Year 12

13 Scientific highlights: High-T c superconductors 13

14 Comparative study of thermoelectric transport in the cuprates YBCO and La (1.8-x) Eu 0.2 Sr x CuO 4 (Eu-LSCO) shows that the two materials exhibit the same process of Fermi-surface reconstruction as a function of temperature and doping, suggesting stripes, well established in Eu-LSCO, to be also present in YBCO Nature Comm. 2 (2011) 14

15 Angular dependence of quantum oscillations in YBa 2 Cu 3 O 6.59 Fermi surface consisting of two small, quasi-two-dimensional cylinders with quasiparticles behaving as nearly free spins, constraining the source of the Fermisurface reconstruction to something other than a spin-density wave with moments perpendicular to the magnetic field. Nature Phys. 7 (2011) 15

16 The discovery of quantum oscillations in HgBa2CuO4+ suggests that this phenomenon has a universal character in hole doped HTc cuprates. A common mechanism related to the CuO2 plane causes a Fermi-surface reconstruction that leads to a small, closed and coherent electron pocket. Nature Phys. 9 (2013) 16

17 Use of thermal conductivity to directly detect H c2 in YBa 2 Cu 3 O y, YBa 2 Cu 4 O 8 and Tl 2 Ba 2 CuO 6+ allows to map out H c2 across the doping phase diagram. Phase competition, associated with Fermi-surface reconstruction and CDW order is a key limiting factor in the superconductivity of cuprates. Nature Comm. 5 (2014) 17

18 Scientific highlights: X-ray & neutron scattering 18

19 Magnetic structure of phase II in U(Ru 0.96 Rh 0.04 ) 2 Si 2 at 30 T determined by neutron diffraction; PRL 110 (2013) 19

20 Scientific highlights: Semiconductor & nano-systems 20

21 Measurement of the in- and out-of-plan magnetoresistance of kish graphite in the extreme quantum limit. Observation of the field-induced creation and destruction of two distinct electronic phases. PRL 110 (2013) 21

22 Magneto-conductance of InAs quantum wires. The modulation of the conductance reflects the loss of conductance channels as magnetic subbands successively cross the Fermi energy. PRL 112 (2014) 22

23 Magneto-resistance of graphene nano-ribbons. Confinement of Dirac fermions depending on magnetic field, crystal structure and dimensions of the nanoribbons. PRL 107 (2011) 23

24 Integer QHE in trilayer graphene. Theoretical analysis suggests rhombohedral stacking of the trilayer. PRL 107 (2011) 24

25 Beyond 100 Tesla 25

26 K in routine operation Up to 300 T in small diameter coils Repetitive experiments 5 μs duration Primarily optical measurements 26

27 Graphite interband spectroscopy in Megagauss fields Charge carriers at the K-point of graphite behave as massive Dirac fermions within 2 ev above and below the Fermi energy. PRL 111 (2013) First measurements > 150 T, < 10 K with new cryogenic equipment. 27

28 New topics 28

29 Laboratory astrophysics T pulsed split coil magnet mounted at LULI TITAN/LLNL Understanding the impact of magnetic fields on plasma flows of astrophysical relevance First demonstration of collimation of plasma flows by B fields in Second campaign in 2013 at LLNL (USA) to study shocks in Super Nova Remnants. Third campaign planned in 2014 on accretation dynamics in binary stars. PRL 110 (2013) ; RSI 84 (2013) Patent n (2013) INPI-France Science in the press (2014) Experiment Astrophysical simulation B 29

30 Electrical magneto-chiral anisotropy in a bulk chiral molecular conductor Linear magneto-resistance measurements have been proven to discriminate between the two enantiomers of bulk chiral conductors. Nature Comm. 5 (2014) 30