Topological Quantum Phases in Correlated Electron Systems with Large Spin-Orbit Coupling

P. Gegenwart, A. A. Tsirlin

Publications

  • A. Revelli, M. Moretti Sala, G. Monaco, M. Magnaterra, J. Attig, L. Peterlini, T. Dey, A. A. Tsirlin, P. Gegenwart, T. Fröhlich, M. Braden, C. Grams, J. Hemberger, P. Becker, P. H. M. van Loosdrecht, D. I. Khomskii, J. van den Brink, M. Hermanns, M. Gr"uninger, Quasimolecular electronic structure of the spin-liquid candidate Ba$_3$InIr$_2$O$_9$, Phys. Rev. B 106, 155107 (2022) [E6]
  • V.P. Bader, J. Langmann, P. Gegenwart, A. A Tsirlin, Deformation of the triangular spin-1/2 lattice in Na$_2$SrCo(PO$_4$)$_2$, Phys. Rev. B 106, 054415 (2022) [E6]
  • A. Wörl, M. Garst, Y. Yamane, S. Bachus, T. Onimaru, P. Gegenwart, Divergent thermal expansion and Gr\"uneisen ratio in a quadrupolar Kondo metal, Phys. Rev. Research 4, L022053 (2022) [E6]
  • D.M. Evans, O.G. Grendal, L. Prodan, M. Winkler, N. Winterhalter-Stocker, P. Gegenwart, S. Ghara, J. Deisenhofer, I. Kezsmarki, V. Tsurkan, Resolving structural changes and symmetry lowering in spinel FeCr2S4, Phys. Rev. B 105, 174107 (2022) [E6,F4,F5]
  • M. Majumder, R. Gupta, H. Luetkens, R. Khasanov, O. Stockert, P. Gegenwart, V. Fritsch, Spin-liquid signatures in the quantum critical regime of pressurized CePdAl, Phys. Rev. B. 105, L180402 (2022) [E6]
  • B Shen, F. Breitner, D. Prishchenko, R. S. Manna, A. Jesche, M.L. Seidler, P. Gegenwart, A. A. Tsirlin, Pressure-induced dimerization and collapse of antiferromagnetism in the Kitaev material $\alpha$-Li$_2$IrO$_3$, Phys. Rev. B. 105, 054412 (2022) [E6]
  • L. Bhaskaran, A.N. Ponomaryov, J. Wosnitza, N. Khan, A. A. Tsirlin, M. Zhitomirsky, S. A. Zvyagin, Antiferromagnetic resonance in the cubic iridium hexahalides (NH$_4$)$_2$IrCl$_6$ and K$_2$IrCl$_6$, Phys 104, 184404 (2021) [E6]
  • D. Badrtdinov, L. Ding, C. Ritter, J. Hembacher, N. Ahmed, Y. Skourski, A. A. Tsirlin, MoP$_3$SiO$_{11}$: A $4d^3$ honeycomb antiferromagnet with disconnected octahedra, Phys. Rev. B 104, 094428 (2021) [E6]
  • B Shen, A Jesche, M.L. Seidler, F. Freund, P. Gegenwart, A. A Tsirlin, Interplay of magnetism and dimerization in the pressurized Kitaev material $\beta$-Li$_2$IrO$_3$, Phys. Rev. B 104, 134426 (2021) [E6]
  • A. A. Tsirlin, P. Gegenwart, Kitaev Magnetism through the Prism of Lithium Iridate, Phys. Status Solidi B 2100146 (2021) [E6]
  • K. Somesh, Y. Furukawa, G. Simutis, F. Bert, M. Prinz-Zwick, N. Buttgen, A. Zorko, A. A. Tsirlin, P. Mendels, R. Nath, Universal fluctuating regime in triangular chromate antiferromagnets, Phys. Rev. B 104, 104422 (2021) [F4,E6]
  • Y. Shimura, A. Wörl, M. Sundermann, S. Tsuda, D. Adroja, A. Bhattacharya, A.M. Strydom, A.D. Hillier, F. L. Pratt, A. Gloskovskii, A. Severing, T. Onimaru, P. Gegenwart, T. Takabatake, Antiferromagnetic Correlations in Strongly Valence Fluctuating CeIrSn, Phys. Rev. Lett. 126, 217202 (2021) [E6]
  • T. Dziuba, I. Pietsch, M. Stark, G.A. Traeger, P. Gegenwart, M. Wenderoth, Surface Conductivity of the Honeycomb Spin-Orbit Mott Insulator Na$_2$IrO$_3$, Phys. Status Solidi B 258, 2000421 (2021) [E6]
  • Y. Tokiwa, S. Bachus, K. Kavita, A. Jesche, A. A. Tsirlin, P. Gegenwart, Frustrated magnet for adiabatic demagnetization cooling to milli-Kelvin temperatures, Comm. Mater. 2, 42 (2021) [E6]
  • S. Bachus, D.A.S. Kaib, A. Jesche, V. Tsurkan, A. Loidl, S.M. Winter, A. A. Tsirlin, R. Valenti, P. Gegenwart, Angle-dependent thermodynamics of \alpha RuCl3, Phys. Rev. B 103, 054440 (2021) [E6]
  • K. Geirhos, J. Langmann, L. Prodan, A. A. Tsirlin, A. Missiul, G. Eickerling, A. Jesche, V. Tsurkan, P. Lunkenheimer, W. Scherer, I. Kézsmárki, Cooperative cluster Jahn-Teller effect as a possible route to antiferroelectricity, Phys. Rev. Lett. 126, 187601 (2021) [F5,E6]
  • D. Szaller, K. Szasz, S. Bordács, J. Viirok, T. Rőőm, U. Nagel, A. Shuvaev, L. Weymann, A. Pimenov, A. A. Tsirlin, A. Jesche, L. Prodan, V. Tsurkan, I. Kézsmárki, Magnetic anisotropy and exchange paths for octahedrally and tetrahedrally coordinated Mn$^{2+}$ ions in the honeycomb multiferroic Mn$_2$Mo$_3$O$_8$, Phys. Rev. B 102, 144410 (2020) [F5,E6]
  • S. Reschke, A. A. Tsirlin, N. Khan, L. Prodan, V. Tsurkan, I. Kézsmárki, J. Deisenhofer, Structure, phonons, and orbital degrees of freedom in Fe$_2$Mo$_3$O$_8$, Phys. Rev. B 102, 094307 (2020) [F5,E6]
  • Y. Li, A. A. Tsirlin, T. Dey, P. Gegenwart, R. Valenti, S. M. Winter, Soft and anisotropic local moments in 4d and 5d mixed-valence M2O9 dimers, Phys. Rev. B 102, 235142 (2020) [E6]
  • A. Revelli, M. Moretti Sala, G. Monaco, G. Hickey, P. Becker, F. Freund, A. Jesche, P. Gegenwart, T. Eschmann, F.L. Buessen, S. Trebst, P. H. M. van Loosdrecht, J. van den Brink, M. Gr"uninger, Fingerprints of Kitaev physics in the magnetic excitations of honeycomb iridates, Phys. Rev. Res. 2, 043094 (2020) [E6]
  • S. Bachus, I. Iakovlev, Y. Li, A. Wörl, Y. Tokiwa, L. Ling, Q. Zhang, V. V. Mazurenko, P. Gegenwart, A. A. Tsirlin, Field evolution of the spin-liquid candidate YbMgGaO$_4$, Phys. Rev. B 102, 104433 (2020) [E6]
  • S. Bachus, D.A.S. Kaib, Y. Tokiwa, A. Jesche, V. Tsurkan, A. Loidl, S.M. Winter, A. A. Tsirlin, R. Valenti, P. Gegenwart, Thermodynamic Perspective on Field-Induced Behavior of $\alpha$-RuCl3, Phys. Rev. Lett. 125, 097203 (2020) [E6]
  • M. Majumder, M. Prinz-Zwick, S. Reschke, A. Zubtsovskii, T. Dey, F. Freund, N. Buttgen, A. Jesche, I. Kezsmarki, A. A. Tsirlin, P. Gegenwart, Field evolution of low-energy excitations in the hyperhoneycomb magnet $\beta$-Li$_2$IrO$_3$, Phys. Rev. B 101, 214417 (2020) [E6,F4]
  • Mayukh Majumder, M. Prinz-Zwick, S. Reschke, A. Zubtsovskii, T. Dey, F. Freund, N. Büttgen, A. Jesche, I. Kezsmarki, A. A. Tsirlin, P. Gegenwart, Field evolution of low-energy excitations in the hyperhoneycomb magnet $\beta$ - Li$_2$IrO$_3$, Phys. Rev. B 101, 214417 (2020) [F4,E6]
  • M. Majumder, G. Simutis, I. Collings, J.C. Orain, T. Dey, Y. Li, P. Gegenwart, A. A. Tsirlin, Persistent spin dynamics in the pressurized spin-liquid candidate YbMgGaO4, Phys. Rev. Res. 2, 023191 (2020) [E6]
  • K. Zhao, H. Deng, H. Chen, K.A. Ross, V. Petricek, G. Guenther, M. Russina, V. Hutanu, P. Gegenwart, Realization of the kagome spin ice state in a frustrated intermetallic compound, Science 367, 1218 (2020) [E6]
  • Y. Li, P. Gegenwart, A. A. Tsirlin, Spin liquids in geometrically perfect triangular antiferromagnets, J. Phys.: Condens. Matter 32, 224004 (2020) [E6]
  • Y. Li, S. Bachus, H. Deng, W. Schmidt, H. Thoma, V. Hutanu, Y. Tokiwa, A. A. Tsirlin, P. Gegenwart, Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO$_4$, Phys. Rev. X 10, 011007 (2020) [E6]
  • N. Khan, D. Prishchenko, Y. Skourski, V. G. Mazurenko, A. A. Tsirlin, Cubic symmetry and magnetic frustration on the fcc spin lattice in K$_2$IrCl$_6$, Phys. Rev. B 99, 144425 (2019) [E6]
  • J.G. Vale, C.D. Dashwood, E. Paris, L.S.I. Veiga, M. Garcia-Fernandez, A. Nag, A. Walters, K.-J. Zhou, I. Pietsch, A. Jesche, P. Gegenwart, R. Coldea, T. Schmitt, D. F. McMorrow, High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb $\alpha$-Li$_2$IrO$_3$, Phys. Rev. B 100, 224303 (2019) [E6]
  • L. Ding, P. Manuel, S. Bachus, F. Grussler, P. Gegenwart, J. Singleton, R. D. Johnson, H.C. Walker, D. Adroja, A.D. Hillier, A. A. Tsirlin, Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO$_2$, Phys. Rev. B 100, 144432 (2019) [E6]
  • H. Zhao, J. Zhang, M. Lyu, S. Bachus, Y. Tokiwa, P. Gegenwart, S. Zhang, J. Cheng, Y. Yang, G. Chen, Y. Isakawa, Q. Si, F. Steglich, P. Sun, Quantum-critical phase from frustrated magnetism in a strongly correlated metal, Nat. Phys. 15, 1261 (2019) [E6]
  • M. Majumder, F. Freund, T Dey, M. Prinz-Zwick, N. Büttgen, Y. Skourski, A. Jesche, A. A. Tsirlin, P. Gegenwart, Anisotropic temperature-field phase diagram of single crystalline $\beta$-Li$_2$IrO$_3$: Magnetization, specific heat, and $^7$Li NMR study, Phys. Rev. Materials 3, 074408 (2019) [E6,F4]
  • V. Hermann, S. Biswas, J. Ebad-Allah, J. Ebad-Allah, F. Freund, A. Jesche, A. A. Tsirlin, M. Hanfland, D. I. Khomskii, P. Gegenwart, R. Valenti, C. A. Kuntscher, Pressure-induced formation of rhodium zigzag chains in the honeycomb rhodate Li$_2$RhO$_3$, Phys. Rev. B 100, 064105 (2019) [E6]
  • V. Hermann, J. Ebad-Allah, F. Freund, A. Jesche, A. A. Tsirlin, P. Gegenwart, C. A. Kuntscher, Optical signature of the pressure-induced dimerization in the honeycomb iridate $\alpha$-Li$_2$IrO$_3$, Phys. Rev. B 99, 235116 (2019) [E6]
  • R. Kumar, T. Dey, P. M. Ette, K. Ramesha, K. Ramesha, A. Chakraborty, I. Dasgupta, R. Eremina, S. Toth, A. Shahee, S. Kundu, M. Prinz-Zwick, A. A. Gippius, H.-A. Krug von Nidda, N. B"uttgen, P. Gegenwart, A. V. Mahajan, Structural, thermodynamic, and local probe investigations of the honeycomb material Ag3LiMn2O6, Phys. Rev. B 99, 144429 (2019) [E6]
  • Y. Li, S. Bachus, B. Liu, I. Radelytskyi, A. Bertin, A. Schneidewind, Y. Tokiwa, A. A. Tsirlin, P. Gegenwart, Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO4, Phys. Rev. Lett. 122, 137201 (2019) [E6]
  • R. Kumar, T. Dey, P. M. Ette, K. Ramesha, A. Chakraborty, I. Dasgupta, R. Eremina, S. Toth, A. Shahee, S. Kundu, M. Prinz-Zwick, A. A. Gippius, H. A. Krug von Nidda, N. Büttgen, P. Gegenwart, A. V. Mahajan, Structural, thermodynamic, and local probe investigations of the honeycomb material Ag$_3$LiMn$_2$O$_6$, Phys. Rev. B 99, 144429 (2019) [F4,E6]
  • A. A. Tsirlin, P. Gegenwart, Frustration mit erstaunlicher Wirkung, Phys. Unserer Zeit 50, 2, 71-77 (2019) [E6]
  • S. Choi, S. Manni, J. Singleton, C.V. Topping, T. Lancaster, S. J. Blundell, D. Adroja, S. Zapf, P. Gegenwart, R. Coldea, Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet $\alpha$-Li$_2$IrO$_3$, Phys. Rev. B 99, 054426 (2019) [E6]
  • R. Kumar, T. Dey, P. M. Ette, K. Ramesha, Atasi Chakraborty, I. Dasgupta, J. C. Orain, C. Baines, Sándor Tóth, A. Shahee, S. Kundu, M. Prinz-Zwick, A. A. Gippius, N. Büttgen, P. Gegenwart, A. V. Mahajan, Unconventional magnetism in the 4$d^4$ - based S = 1 honeycomb system Ag$_3$LiRu$_2$O$_6$, Phys. Rev. B 99, 054417 (2019) [E6,F4]
  • M. Majumder, R. S. Manna, G. Simutis, J. C. Orain, T. Dey, F. Freund, A. Jesche, R. Khasanov, P. K. Biswas, E. Bykova, N. Dubrovinskaia, L.S. Dubrovinsky, R. Yadav, L. Hozoi, S. Nishimoto, A. A. Tsirlin, P. Gegemwart, Breakdown of Magnetic Order in the Pressurized Kitaev Iridate $\beta$-Li$_2$IrO$_3$, Phys. Rev. Lett. 120, 237202 (2018) [E6]
  • Yuesheng Li, S. Bachus, Y. Tokiwa, A. A. Tsirlin, P. Gegenwart, Gapped ground state in the zigzag pseudospin-1/2 quantum antiferromagnetic chain compound PrTiNbO6, Phys. Rev. B 97, 184434 (2018) [E6]
  • V. Hermann, M. Altmeyer, J. Ebad-Allah, F. Freund, A. Jesche, A. A. Tsirlin, M. Hanfland, P. Gegenwart, I. I. Mazin, D. I. Khomskii, R. Valenti, C. A. Kuntscher, Competition between spin-orbit coupling, magnetism, and dimerization in the honeycomb iridates: $\alpha$-Li$_2$IrO$_3$ under pressure, Phys. Rev. B 97, 020104(R) (2018) [E6]

Short Summary

Frustrated magnets with competing interactions and anisotropies can host topologically non-trivial quantum ground states and spin excitations. We seek to find and investigate model materials in the class of strongly correlated oxides with large spin-orbit coupling that will serve as experimental realizations of this intriguing physics. This includes iridate and rhodate Kitaev materials as well as Yb$^{3+}$ oxides with anisotropic magnetism in the triangular geometry. The project combines crystal growth and structural characterization with thermodynamic and transport measurements under multiextreme conditions such as very low temperatures, high magnetic field and high pressure.