Three-dimensional magnetic properties of Bi<sub>2</sub>CuO<sub>4</sub>

Troć, R.; Janicki, J.; Filatow, I.; Fischer, Peter; Murasik, A.

doi:10.1088/0953-8984/2/33/011

Cited by 31 publications

(16 citation statements)

References 11 publications

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“…Powder X-ray diffraction is in good agreement with prior reports of the crystal structure. The magnetization and specific heat are in agreement with earlier literature reports and indicate a transition to the antiferromagnetic order at T N = 43 K. − Utilizing an analytical model for the phonon contribution to the specific heat, we are able to, for the first time, determine the entropy change at the magnetic phase transition, Δ S mag = 0.25 ln(2). This is consistent with the significant (8:1) anisotropy in the magnetic interactions.…”

Section: Introductionsupporting

confidence: 87%

Laser-Enhanced Single Crystal Growth of Non-Symmorphic Materials: Applications to an Eight-Fold Fermion Candidate

et al. 2020

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Materials with nonsymmorphic symmetries have many applications and have recently come to the forefront as possibly harboring new topological states of matter, such as 8-fold fermions. Here, we report the single crystal growth of Bi 2 CuO 4 using the traveling solvent floating zone technique. Using laser heating combined with a 0.875 Bi 2 CuO 4 :0.125 Bi 2 O 3 solvent, we produce untwinned single crystal pieces. Three-dimensional X-ray microcomputed tomography is used to probe the fundamental origins of twinning, grain formation, and growth. Powder X-ray diffraction and Laue diffraction show that Bi 2 CuO 4 crystallizes in the space group P4/ncc (#130), orders antiferromagnetically with T N = 43 K, and, combined with comparisons to the literature, demonstrate the crystallinity and reproducibility of the synthesis. The entropy lost at the magnetic phase transition is ΔS mag = 0.25 ln(2); it arises from a high anisotropy in the magnetic interactions. We carry out a symmetry analysis demonstrating that Bi 2 CuO 4 's magnetic order implies a rich breaking of the parent 8-fold symmetric states. Our results provide a roadmap for the creation of future magnetic derivatives of 8-fold, double Dirac single crystals and related quantum states of matter with nonsymmorphic symmetries. This approach also offers guidance on improving the single growth of nonsymmorphic materials from cuprates to van der Waals solids.

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Section: Introductionsupporting

confidence: 87%

Laser-Enhanced Single Crystal Growth of Non-Symmorphic Materials: Applications to an Eight-Fold Fermion Candidate

et al. 2020

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“…However, neutron diffraction measurements [7][8][9][10][11] revealed a long range threedimensional (3D) AFM order of C-type: in the magnetic unit cell, which coincides with the chemical one, spins in chains are parallel, while spins in neighboring chains are antiparallel. However, the orientation of Cu spins was not unambiguously determined and two magnetic structures were proposed -one with spins parallel to the c axis 7,10 and one with spins within the ab plane 11 .…”

Section: Introductionmentioning

confidence: 99%

Magnetically induced ferroelectricity in Bi2CuO4

et al. 2017

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The tetragonal copper oxide Bi2CuO4 has an unusual crystal structure with a three-dimensional network of well separated CuO4 plaquettes. This material was recently predicted to host electronic excitations with an unconventional spectrum and the spin structure of its magnetically ordered state appearing at TN∼ 43 K remains controversial. Here we present the results of detailed studies of specific heat, magnetic and dielectric properties of Bi2CuO4 single crystals grown by the floating zone technique, combined with the polarized neutron scattering and high-resolution X-ray measurements. Our polarized neutron scattering data show Cu spins are parallel to the ab plane. Below the onset of the long range antiferromagnetic ordering we observe an electric polarization induced by an applied magnetic field, which indicates inversion symmetry breaking by the ordered state of Cu spins. For the magnetic field applied perpendicular to the tetragonal axis, the spin-induced ferroelectricity is explained in terms of the linear magnetoelectric effect that occurs in a metastable magnetic state. A relatively small electric polarization induced by the field parallel to the tetragonal axis may indicate a more complex magnetic ordering in Bi2CuO4.

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“…Despite numerous studies on the crystal structure and low temperature magnetic properties of Bi 2 CuO 4 in the past, 2,8,[17][18][19][20] there is still no consensus on the Bi 2 O 3 -CuO phase diagram and thus the growth conditions required for large, centimeter-sized, high quality Bi 2 CuO 4 single crystals. In the existing literature, the phase diagrams are very contradictory [21][22][23][24][25][26][27][28][29] and often the growth conditions are insufficiently detailed.…”

Section: Introductionmentioning

confidence: 99%