Quantum matter in high magnetic fields

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

ArXiv 0908.4169 (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

Abstract:

We report the electronic and magnetic behaviour of the frustrated triangular metallic antiferromagnet 2H-AgNiO2 in high magnetic fields (54 T) using thermodynamic and transport measurements. Here localized d electrons are arranged on an antiferromagnetic triangular lattice nested inside a honeycomb lattice with itinerant d electrons. When the magnetic field is along the easy axis we observe a cascade of field-induced transitions, attributed to the competition between easy-axis anisotropy, geometrical frustration and coupling of the localized and itinerant system. The quantum oscillations data suggest that the Fermi surface is reconstructed by the magnetic order but in high fields magnetic breakdown orbits are possible. The itinerant electrons are extremely sensitive to scattering by spin fluctuations and a significant mass enhancement (~ 3) is found.
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