Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5
(2010)
A chiral ferromagnetic molecular metal.
J Am Chem Soc 132:27 (2010) 9271-9273
Abstract:
The first molecular material with the coexistence of ferromagnetism, metal-like conductivity, and chirality has been prepared using an organic/inorganic approach. In this case, a two-dimensional packing of chiral organic radical cations (responsible for both the electrical conductivity and optical activity) was assembled with a layered bimetallic oxalate-based anionic network (responsible for the magnetic properties). Shubnikov-de Haas oscillations confirmed the presence of a Fermi surface even when the transport properties suggested "insulating"-type behavior at very low temperatures.Dimensionality-driven spin-flop transition in quasi-one-dimensional PrBa2 Cu4 O8
Physical Review B - Condensed Matter and Materials Physics 81:22 (2010)
Abstract:
In the quasi-one-dimensional cuprate PrBa2 Cu4 O 8, the Pr cations order antiferromagnetically at 17 K in zero field. Through a combination of magnetic susceptibility, torque magnetometry, specific heat, and interchain transport measurements, the anisotropic temperature-magnetic-field phase diagram associated with this ordering has been mapped out. A low-temperature spin-flop transition in the Pr sublattice is found to occur at the same magnetic field strength and orientation as a dimensional crossover in the ground state of the metallic-CuO chains. This coincidence suggests that the spin reorientation is driven by a change in the anisotropic Rudermann-Kittel-Kasuya-Yosida interaction induced by a corresponding change in effective dimensionality of the conduction electrons. ? 2010 The American Physical Society.20pGH-9 dHvA効果からみたBaFe_2(As_<1-x>P_x)_2のフェルミ面の変化(20pGH FeAs系超伝導(分光),領域8(強相関系:高温超伝導,強相関f電子系など))
(2010) 564
Evolution of the Fermi surface of BaFe2(As1-xPx){2} on entering the superconducting dome.
Phys Rev Lett 104:5 (2010) 057008