Quantum matter in high magnetic fields

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Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5

(2010)

Authors:

A Serafin, AI Coldea, AY Ganin, MJ Rosseinsky, K Prassides, D Vignolles, A Carrington
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A chiral ferromagnetic molecular metal.

J Am Chem Soc 132:27 (2010) 9271-9273

Authors:

José R Galán-Mascarós, Eugenio Coronado, Paul A Goddard, John Singleton, Amalia I Coldea, John D Wallis, Simon J Coles, Antonio Alberola

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.
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Dimensionality-driven spin-flop transition in quasi-one-dimensional PrBa2 Cu4 O8

Physical Review B - Condensed Matter and Materials Physics 81:22 (2010)

Authors:

X Xu, A Carrington, AI Coldea, A Enayati-Rad, A Narduzzo, S Horii, NE Hussey

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.
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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

Authors:

宍戸 寛明, AF Bangura, AI Coldea, 橋本 顕一郎, 笠原 成, PMC Rourke, 池田 浩章, 寺嶋 孝仁, 利根川 翔, 摂待 力生, 大貫 惇睦, D Vignolles, C Proust, B Vignolle, A McCollam, 芝内 孝禎, 松田 祐司, A Carrington
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Evolution of the Fermi surface of BaFe2(As1-xPx){2} on entering the superconducting dome.

Phys Rev Lett 104:5 (2010) 057008

Authors:

H Shishido, AF Bangura, AI Coldea, S Tonegawa, K Hashimoto, S Kasahara, PMC Rourke, H Ikeda, T Terashima, R Settai, Y Onuki, D Vignolles, C Proust, B Vignolle, A McCollam, Y Matsuda, T Shibauchi, A Carrington

Abstract:

Using the de Haas-van Alphen effect we have measured the evolution of the Fermi surface of BaFe2(As1-xPx){2} as a function of isoelectric substitution (As/P) for 0.41
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