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Beecroft building, Department of Physics, University of Oxford
Credit: Jack Hobhouse

Prof. J. C. Seamus Davis

Professor of Physics

Research theme

  • Fields, strings, and quantum dynamics
  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Macroscopic Quantum Matter
seamus.davis@physics.ox.ac.uk
Telephone: +353830392937
Clarendon Laboratory, room 512.40.28
davis-group-quantum-matter-research.ie
  • About
  • Publications

Common glass-forming spin-liquid state in the pyrochlore magnets Dy2Ti2 O7 and Ho2Ti2 O7

Physical Review B 98:21 (2018)

Authors:

AB Eyvazov, R Dusad, TJS Munsie, HA Dabkowska, GM Luke, ER Kassner, JCS Davis, A Eyal

Abstract:

© 2018 American Physical Society. Despite a well-ordered pyrochlore crystal structure and strong magnetic interactions between the Dy3+ or Ho3+ ions, no long-range magnetic order has been detected in the pyrochlore titanates Ho2Ti2O7 and Dy2Ti2O7. To explore the actual magnetic phase formed by cooling these materials, we measure their magnetization dynamics using toroidal, boundary-free magnetization transport techniques. We find that the dynamical magnetic susceptibility of both compounds has the same distinctive phenomenology, which is indistinguishable in form from that of the dielectric permittivity of dipolar glass-forming liquids. Moreover, Ho2Ti2O7 and Dy2Ti2O7 both exhibit microscopic magnetic relaxation times that increase along the super-Arrhenius trajectories analogous to those observed in glass-forming dipolar liquids. Thus, upon cooling below about 2 K, Dy2Ti2O7 and Ho2Ti2O7 both appear to enter the same magnetic state exhibiting the characteristics of a glass-forming spin liquid.
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Phase diagram of Bi2Sr2CaCu2O8+δ revisited

Nature Communications Springer Nature 9:1 (2018) 5210

Authors:

IK Drozdov, I Pletikosić, C-K Kim, K Fujita, GD Gu, JC Séamus Davis, PD Johnson, I Božović, T Valla
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Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe

Nature Materials Springer Nature 17:10 (2018) 869-874

Authors:

A Kostin, PO Sprau, A Kreisel, Yi Xue Chong, AE Böhmer, PC Canfield, PJ Hirschfeld, BM Andersen, JC Séamus Davis
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Pair density waves in superconducting vortex halos

PHYSICAL REVIEW B 97:17 (2018) ARTN 174510

Authors:

Yuxuan Wang, Stephen D Edkins, Mohammad H Hamidian, JC Seamus Davis, Eduardo Fradkin, Steven A Kivelson
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In-situ angle-resolved photoemission spectroscopy of copper-oxide thin films synthesized by molecular beam epitaxy

Journal of Electron Spectroscopy and Related Phenomena (2018)

Authors:

CK Kim, IK Drozdov, K Fujita, JCS Davis, I Božović, T Valla

Abstract:

© 2018 Elsevier B.V. Angle-resolved photoemission spectroscopy (ARPES) is the key momentum-resolved technique for direct probing of the electronic structure of a material. However, since it is highly surface-sensitive, it has been applied to a relatively small set of complex oxides that can be easily cleaved in ultra-high vacuum. Here we describe a new multi-module system at Brookhaven National Laboratory (BNL) in which an oxide molecular beam epitaxy (OMBE) is interconnected with an ARPES and a spectroscopic-imaging scanning tunneling microscopy (SI-STM) module. This new capability largely expands the range of complex-oxide materials and artificial heterostructures accessible to these two most powerful and complementary techniques for studies of electronic structure of materials. We also present the first experimental results obtained using this system — the ARPES studies of electronic band structure of a La2-xSrxCuO4 (LSCO) thin film grown by OMBE.
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