Friday, July 23, 2010, 11:00 am — Bldg. 480 conference room
Frustrated magnets have attracted major interest due to their dazzling
| array of unusual phenomena. These include magnetic monopoles in spin ice
| [1], spin liquid behavior [2], or quantum criticality. The latter has
| been proposed to originate from a quantum phase transition between a
| highly frustrated spin liquid ground state and a heavy Fermi liquid
| phase [3].
|
| In this talk, I will present low-temperature thermal expansion
| measurements and a subsequent thermal and magnetic Grüneisen ratio
| analyses which provide compelling experimental evidence for a quantum
| critical point in Pr2Ir2O7 at zero magnetic field. The temperature
| dependences of these quantities are incompatible with a spin density
| wave scenario and rather suggest---in line with theory---the proximity
| to Kondo breakdown quantum criticality .
|
| [1] Morris et al, Science (2009)
| [2] Machida et al, Nature (2010)
| [3] Burdin et al, PRB (2002)
Hosted by: Meigan Aronson
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