Cuprates neutron scattering

The problem of anti ferromagnetic (AF) ordering in applied magnetic field observed at low temperatures in the high-T), cuprates from neutron scattering [1] (and supporting picture from STM measurements [2]) is intensively discussed now. This AF ordering (spin density wave (SDW)) is... 

It should be noted here that the conclusion about s-wave nature of the SC order parameter is consistent with conclusion about s-wave symmetry of the SC order parameter in the bulk and d-wave symmetry at the surface of the sample of the cuprates [17]. It was noted in [17] that most conclusions about d-wave symmetry was obtained in experiments (e.g. ARPES ones) on the cuprates in which mainly surface phenomena have been used. In this sense, the resistive measurements on the cuprates (see, e.g. [4]) are essentially bulk in the nature. In addition, the electron scattering (in resistivity measurements) is sensitive to the spin disorder in the system (magnetic contribution in the electrical resistivity appears, see Sec.l). Moreover, the electron scattering permits probe not only static magnetic order but dynamical (short-lived) ones because of short characteristic times as compared e.g. with usual neutron scattering. 

See for review Bourges P., (1998). From Magnons to the Resonance Peak Spin Dynamics in High-Tc Superconducting Cuprates by Inelastic Neutron Scattering in The Gap Symmetry and Fluctuations in High Temperature Superconductors edited by Bok J., Deutscher... 

Onufrieva F., and Pfeuty P., (2002). Spin dynamics of a two-dimensional metal in a superconducting state Application to the high-Tc cuprates Phys. Rev. B 65 054515 Manske D., Eremin I., and Bennemann K.H., (2001). Analysis of the resonance peak and magnetic coherence seen in inelastic neutron scattering of cuprate superconductors A consistent picture with tunneling and conductivity data. Phys. Rev. B 63 054517. 

Chapter 200, by Peter M. Allenspach and M. Brian Maple, reviews some aspects of the low-temperature heat capacity of the ceramic oxide superconductors. These measurements yield valuable information about the electronic, lattice, magnetic, crystalline electric field and hyperfine nature of the various rare-earth cuprate materials, and in that respect compliment other physical property studies, such as neutron diffraction, inelastic neutron scattering, and various spectroscopic measurements. The authors review the heat-capacity properties of the stoichiometric RBaCu307 compoimds and oxygen-deficient materials, and show that there are significant differences. The heat capacities of other lanthanide cuprates, such as RBa2Cu40g and R2B4CU7O14+X, are also discussed. 

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