Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d

Details Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d

2008-05-19

arxiv.org/abs/0805.2959v1

Nature 455, 372 (2008)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

The nature of the enigmatic pseudogap region of the phase diagram is the most important and intriguing unsolved puzzle in the field of high transition-temperature (Tc) superconductivity. This region, the temperature range above Tc and below a characteristic temperature T*, is characterized by highly anomalous magnetic, charge transport, thermodynamic and optical properties. Associated with the pseudogap puzzle are open questions pertaining to the number of distinct phases and the presence of a quantum-critical point underneath the superconducting dome. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa2CuO4+d (Hg1201) that T* marks the onset of an unusual magnetic order, and hence a novel state of matter with broken time-reversal symmetry. Together with prior results for YBa2Cu3O6+d (YBCO), this observation constitutes an essential and decisive demonstration of the universal existence of such a state. The new findings appear to rule out a large class of theories that regard T* as a crossover temperature rather than a phase transition temperature. Instead, they are consistent with a variant of previously proposed charge-current-loop order that involves apical oxygen orbitals, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point.

Affiliated with

Also associated with

No associations

Rating

Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d 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 Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-299440