Zobrazeno 1 - 10
of 557
pro vyhledávání: '"Freund, F."'
Autor:
Majumder, M., Prinz-Zwick, M., Reschke, S., Zubtsovskii, A., Dey, T., Freund, F., Büttgen, N., Jesche, A., Kézsmárki, I., Tsirlin, A. A., Gegenwart, P.
Publikováno v:
Phys. Rev. B 101, 214417 (2020)
$^7$Li nuclear magnetic resonance (NMR) and terahertz (THz) spectroscopies are used to probe magnetic excitations and their field dependence in the hyperhoneycomb Kitaev magnet $\beta$-Li$_2$IrO$_3$. Spin-lattice relaxation rate ($1/T_1$) measured do
Externí odkaz:
http://arxiv.org/abs/1910.03251
Autor:
Majumder, M., Freund, F., Dey, T., Prinz-Zwick, M., Büttgen, N., Skourski, Y., Jesche, A., Tsirlin, A. A., Gegenwart, P.
Publikováno v:
Phys. Rev. Materials 3, 074408 (2019)
Detailed magnetization, specific heat, and $^7$Li nuclear magnetic resonance (NMR) measurements on single crystals of the hyperhoneycomb Kitaev magnet $\beta$-Li$_2$IrO$_3$ are reported. At high temperatures, {\cred anisotropy of the magnetization is
Externí odkaz:
http://arxiv.org/abs/1906.09089
Autor:
Revelli, A., Sala, M. Moretti, Monaco, G., Hickey, C., Becker, P., Freund, F., Jesche, A., Gegenwart, P., Eschmann, T., Buessen, F. L., Trebst, S., van Loosdrecht, P. H. M., Brink, J. van den, Grüninger, M.
Publikováno v:
Phys. Rev. Research 2, 043094 (2020)
In the quest for realizations of quantum spin liquids, the exploration of Kitaev materials - spin-orbit entangled Mott insulators with strong bond-directional exchanges - has taken center stage. However, in these materials the local spin-orbital j=1/
Externí odkaz:
http://arxiv.org/abs/1905.13590
Autor:
Hermann, V., Ebad-Allah, J., Freund, F., Jesche, A., Tsirlin, A. A., Gegenwart, P., Kuntscher, C. A.
Publikováno v:
Phys. Rev. B 99, 235116 (2019)
We studied the effect of external pressure on the electrodynamic properties of $\alpha$-Li$_2$IrO$_3$ single crystals in the frequency range of the phonon modes and the Ir $d$-$d$ transitions. The abrupt hardening of several phonon modes under pressu
Externí odkaz:
http://arxiv.org/abs/1905.12456
Autor:
Hermann, V., Biswas, S., Ebad-Allah, J., Freund, F., Jesche, A., Tsirlin, A. A., Hanfland, M., Khomskii, D., Gegenwart, P., Valentí, R., Kuntscher, C. A.
Publikováno v:
Phys. Rev. B 100, 064105 (2019)
We use powder x-ray diffraction to study the effect of pressure on the crystal structure of the honeycomb rhodate Li$_2$RhO$_3$. We observe low-pressure ($P$$<$$P_{c1}$ = 6.5 GPa) and high-pressure ($P$$>$$P_{c2}$ = 14 GPa) regions corresponding to t
Externí odkaz:
http://arxiv.org/abs/1905.04930
Autor:
Majumder, M., Manna, R. S., Simutis, G., Orain, J. C., Dey, T., Freund, F., Jesche, A., Khasanov, R., Biswas, P. K., Bykova, E., Dubrovinskaia, N., Dubrovinsky, L. S., Yadav, R., Hozoi, L., Nishimoto, S., Tsirlin, A. A., Gegenwart, P.
Publikováno v:
Phys. Rev. Lett. 120, 237202 (2018)
Temperature-pressure phase diagram of the Kitaev hyperhoneycomb iridate $\beta$-Li$_2$IrO$_3$ is explored using magnetization, thermal expansion, magnetostriction, and muon spin rotation ($\mu$SR) measurements, as well as single-crystal x-ray diffrac
Externí odkaz:
http://arxiv.org/abs/1802.06819
Autor:
Hermann, V., Altmeyer, M., Ebad-Allah, J., Freund, F., Jesche, A., Tsirlin, A. A., Hanfland, M., Gegenwart, P., Mazin, I. I., Khomskii, D. I., Valentí, R., Kuntscher, C. A.
Publikováno v:
Phys. Rev. B 97, 020104 (2018)
Single-crystal x-ray diffraction studies with synchrotron radiation on the honeycomb iridate $\alpha$-Li$_{2}$IrO$_{3}$ reveal a pressure-induced structural phase transition with symmetry lowering from monoclinic to triclinic at a critical pressure o
Externí odkaz:
http://arxiv.org/abs/1712.01669
Autor:
Hermann, V., Ebad-Allah, J., Freund, F., Pietsch, I. M., Jesche, A., Tsirlin, A. A., Deisenhofer, J., Hanfland, M., Gegenwart, P., Kuntscher, C. A.
Publikováno v:
Phys. Rev. B 96, 195137 (2017)
We study the effect of isoelectronic doping and external pressure in tuning the ground state of the honeycomb iridate Na$_2$IrO$_3$ by combining optical spectroscopy with synchrotron x-ray diffraction measurements on single crystals. The obtained opt
Externí odkaz:
http://arxiv.org/abs/1711.00713
Publikováno v:
Nature Scientific Reports 6, Article number: 35362 (2016)
Thorough mixing of the starting materials is the first step of a crystal growth procedure. This holds true for almost any standard technique, whereas the intentional separation of educts is considered to be restricted to a very limited number of case
Externí odkaz:
http://arxiv.org/abs/1604.04551
Autor:
Williams, S. C., Johnson, R. D., Freund, F., Choi, Sungkyun, Jesche, A., Kimchi, I., Manni, S., Bombardi, A., Manuel, P., Gegenwart, P., Coldea, R.
Publikováno v:
Phys. Rev. B 93, 195158 (2016)
The layered honeycomb magnet $\alpha$-Li$_2$IrO$_3$ has been theoretically proposed as a candidate to display novel magnetic behaviour associated with Kitaev interactions between spin-orbit entangled $j_{\rm eff}=1/2$ magnetic moments on a honeycomb
Externí odkaz:
http://arxiv.org/abs/1602.07990