Zobrazeno 1 - 10
of 212
pro vyhledávání: '"Piazza, B."'
Publikováno v:
Phys. Rev. B 102, 214413 (2020)
We investigate the spin-1/2 Heisenberg model on a rectangular lattice, using the Gutzwiller projected variational wave function known as the staggered flux state. Using Monte Carlo techniques, the variational parameters and static spin-structure fact
Externí odkaz:
http://arxiv.org/abs/2005.03928
Autor:
Babkevich, P., Nikseresht, N., Kovacevic, I., Piatek, J. O., Piazza, B. Dalla, Kraemer, C., Krämer, K. W., Prokeš, K., Mat'aš, S., Jensen, J., Rønnow, H. M.
Publikováno v:
Phys. Rev. B 94, 174443 (2016)
We present a systematic study of the phase diagram of LiHo$_x$Y$_{1-x}$F$_4$ ($0.25
Externí odkaz:
http://arxiv.org/abs/1611.09777
Autor:
Babkevich, P., Finco, A., Jeong, M., Piazza, B. Dalla, Kovacevic, I., Klughertz, G., Krämer, K. W., Kraemer, C., Adroja, D. T., Goremychkin, E., Unruh, T., Strässle, T., Di Lieto, A., Jensen, J., Rønnow, H. M.
Publikováno v:
Phys. Rev. B 92, 144422 (2015)
We present a systematic study of the crystal field interactions in the Li$R$F$_4$, $R$ = Gd, Ho, Er, Tm and Yb, family of rare-earth magnets. Using detailed inelastic neutron scattering measurements we have been able to quantify the transition energi
Externí odkaz:
http://arxiv.org/abs/1510.07416
Autor:
Fatuzzo, C. G., Dantz, M., Fatale, S., Olalde-Velasco, P., Shaik, N. E., Piazza, B. Dalla, Toth, S., Pelliciari, J., Fittipaldi, R., Vecchione, A., Kikugawa, N., Brooks, J. S., Rønnow, H. M., Grioni, M., Rüegg, Ch., Schmitt, T., Chang, J.
Publikováno v:
Phys. Rev. B 91, 155104 (2015)
High-resolution resonant inelastic X-ray scattering (RIXS) at the oxygen K-edge has been used to study the orbital excitations of Ca2RuO4 and Sr2RuO4. In combination with linear dichroism X-ray absorption spectroscopy, the ruthenium 4d-orbital occupa
Externí odkaz:
http://arxiv.org/abs/1503.01574
Autor:
Piazza, B. Dalla, Mourigal, M., Christensen, N. B., Nilsen, G. J., Tregenna-Piggott, P., Perring, T. G., Enderle, M., McMorrow, D. F., Ivanov, D. A., Rønnow, H. M.
Publikováno v:
Nature Physics 11 (2015) 62-68
The square-lattice quantum Heisenberg antiferromagnet displays a pronounced anomaly of unknown origin in its magnetic excitation spectrum. The anomaly manifests itself only for short wavelength excitations propagating along the direction connecting n
Externí odkaz:
http://arxiv.org/abs/1501.01767
Autor:
Piatek, J. O., Kovacevic, I., Babkevich, P., Piazza, B. Dalla, Neithardt, S., Gavilano, J., Krämer, K. W., Rønnow, H. M.
Publikováno v:
Phys. Rev. B 90, 174427 (2014)
We present a study of the model spin-glass LiHo$_{0.5}$Er$_{0.5}$F$_4$ using simultaneous AC susceptibility, magnetization and magnetocaloric effect measurements along with small angle neutron scattering (SANS) at sub-Kelvin temperatures. All measure
Externí odkaz:
http://arxiv.org/abs/1411.5813
Autor:
Häfliger, P. S., Gerber, S., Pramod, R., Schnells, V. I., Piazza, B. dalla, Chati, R., Pomjakushin, V., Conder, K., Pomjakushina, E., Dreau, L. Le, Christensen, N. B., Syljuåsen, O. F., Normand, B., Rønnow, H. M.
Publikováno v:
Physical Review B 89, 085113 (2014)
We study the zero-point and thermal ionic motion in La$_2$CuO$_4$ by means of high-resolution neutron diffraction experiments. Our results demonstrate anisotropic motion of O and to a lesser extent of Cu ions, both consistent with the structure of co
Externí odkaz:
http://arxiv.org/abs/1312.0633
Autor:
Moser, S., Moreschini, L., Ebrahimi, A., Piazza, B. Dalla, Isobe, M., Okabe, H., Akimitsu, J., Mazurenko, V. V., Kim, K. S., Bostwick, A., Rotenberg, E., Chang, J., Rønnow, H. M., Grioni, M.
Publikováno v:
New Journal of Physics, 16 013008 (2014)
We report angle-resolved photoemission (ARPES) measurements, density functional and model tight-binding calculations on Ba$_2$IrO$_4$ (Ba-214), an antiferromagnetic ($T_N=230$ K) insulator. Ba-214 does not exhibit the rotational distortion of the IrO
Externí odkaz:
http://arxiv.org/abs/1310.1307
Autor:
Piatek, J. O., Piazza, B. Dalla, Nikseresht, N., Tsyrulin, N., Živković, I., Krämer, K. W., Laver, M., Prokes, K., Mataš, S., Christensen, N. B., Rønnow, H. M.
Publikováno v:
Phys. Rev. B 88, 014408 (2013)
We present the experimental phase diagram of LiHo$_x$Er$_{1-x}$F$_4$, a dilution series of dipolar-coupled model magnets.The phase diagram was determined using a combination of AC susceptibility and neutron scattering. Three unique phases in addition
Externí odkaz:
http://arxiv.org/abs/1307.4271
Autor:
Dean, M. P. M., Springell, R. S., Monney, C., Zhou, K. J., Bozovic, I., Pereiro, J., Piazza, B. Dalla, Ronnow, H. M., Morenzoni, E., Brink, J. van den, Schmitt, T., Hill, J. P.
Publikováno v:
Nature Materials 11, 850-854 (2012)
The dynamics of S=1/2 quantum spins on a 2D square lattice lie at the heart of the mystery of the cuprates \cite{Hayden2004,Vignolle2007,Li2010,LeTacon2011,Coldea2001,Headings2010,Braicovich2010}. In bulk cuprates such as \LCO{}, the presence of a we
Externí odkaz:
http://arxiv.org/abs/1208.0018