Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$

Details Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$ Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$

2007-10-03

arxiv.org/abs/0710.0896v2

Nature Physics 3, 1 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 5 figures, high quality images available from Nature Replaced document with fixed figures

Scientific paper

10.1038/nphys522

One of the primary goals of modern condensed matter physics is to elucidate the nature of the ground state in various electronic systems. Many correlated electron materials, such as high temperature superconductors, geometrically frustrated oxides, and low-dimensional magnets are still the objects of fruitful study because of the unique properties which arise due to poorly understood many-body effects. Heavy fermion metals - materials which have high effective electron masses due to these effects - represent a class of materials with exotic properties, such as unusual magnetism, unconventional superconductivity, and "hidden order" parameters. The heavy fermion superconductor URu2Si2 has held the attention of physicists for the last two decades due to the presence of a "hidden order" phase below 17.5 K. Neutron scattering measurements indicate that the ordered moment is 0.03 $\mu_{B}$, much too small to account for the large heat capacity anomaly at 17.5 K. We present recent neutron scattering experiments which unveil a new piece of this puzzle - the spin excitation spectrum above 17.5 K exhibits well-correlated, itinerant-like spin excitations up to at least 10 meV emanating from incommensurate wavevectors. The gapping of these excitations corresponds to a large entropy release and explains the reduction in the electronic specific heat through the transition.

Affiliated with

Also associated with

No associations

Rating

Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu$_2$Si$_2$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-562798