Quantum matter in high magnetic fields

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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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Evolution of the Fermi surface of BaFe_2(As_{1-x}P_x)_2 on entering the superconducting dome

(2009)

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
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Interplay between localized and itinerant d electrons in a frustrated metallic antiferromagnet, 2H-AgNiO2

(2009)

Authors:

AI Coldea, A Carrington, R Coldea, L Malone, AF Bangura, MD Johannes, II Mazin, EA Yelland, JG Analytis, JAAJ Perenboom, C Jaudet, D Vignolles, T Sorgel, M Jansen
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