Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)

Details Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x) Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)

2010-08-25

arxiv.org/abs/1008.4298v1

New J. Phys. 12, 105006 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in a special issue on "Fermiology of Cuprates" of the New Journal of Physics

Scientific paper

We present a neutron triple-axis and resonant spin-echo spectroscopy study of the spin correlations in untwinned YBCO crystals with x= 0.3, 0.35, and 0.45 as a function of temperature and magnetic field. As the temperature T approaches 0, all samples exhibit static incommensurate magnetic order with propagation vector along the a-direction in the CuO2 planes. The incommensurability delta increases monotonically with hole concentration, as it does in LSCO. However, delta is generally smaller than in LSCO at the same doping level. The intensity of the incommensurate Bragg reflections increases with magnetic field for YBCO(6.45) (superconducting Tc = 35 K), whereas it is field-independent for YBCO(6.35) (Tc = 10 K). These results suggest that YBCO samples with x ~ 0.5 exhibit incommensurate magnetic order in the high fields used for the recent quantum oscillation experiments on this system, which likely induces a reconstruction of the Fermi surface. We present neutron spin-echo measurements (with energy resolution ~ 1 micro-eV) for T > 0 that demonstrate a continuous thermal broadening of the incommensurate magnetic Bragg reflections into a quasielastic peak centered at excitation energy E = 0, consistent with the zero-temperature transition expected for a two-dimensional spin system with full spin-rotation symmetry. Measurements on YBCO(6.45) with a triple-axis spectrometer (with energy resolution ~ 100 micro-eV) yield a crossover temperature T_SDW ~ 30 K for the onset of quasi-static magnetic order. Upon further heating, the wavevector characterizing low-energy spin excitations approaches the commensurate antiferromagnetic wave vector, and the incommensurability vanishes in an order-parameter-like fashion at an "electronic liquid-crystal" onset temperature T_ELC ~ 150 K. Both T_SDW and T_ELC increase continuously as the Mott-insulating phase is approached with decreasing doping level.

Affiliated with

Also associated with

No associations

Rating

Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x) 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 Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-525507