Zobrazeno 1 - 10
of 157
pro vyhledávání: '"Lobo, R. P. S. M."'
Autor:
Santos-Cottin, D., Nasrallah, S., Capitani, F., Simon, P., Homes, C. C., Akrap, A., Lobo, R. P. S. M.
We measured the far-infrared reflectivity of a KH2PO4 single crystal up to pressures of 2 GPa in the ferroelectric and paraelectric phases. We find that the nu4 vibrational mode of the PO4 tetrahedron is strongly affected by the applied pressure. At
Externí odkaz:
http://arxiv.org/abs/2402.04998
Autor:
Santos-Cottin, D., Casula, M., Medici, L. de', Mardelé, F. Le, Wyzula, J., Orlita, M., Klein, Y., Gauzzi, A., Akrap, A., Lobo, R. P. S. M
We investigate the optical conductivity and far-infrared magneto-optical response of BaNiS$_2$, a simple square-lattice semimetal characterized by Dirac nodal lines that disperse exclusively along the out-of-plane direction. With the magnetic field a
Externí odkaz:
http://arxiv.org/abs/2104.05521
Autor:
Bhadram, V. S., Joseph, B., Delmonte, D., Gilioli, E., Baptiste, B., -Godec, Y. Le, Lobo, R. P. S. M., Gauzzi, A.
Publikováno v:
Phys. Rev. Materials, 5, 104411 (2021)
By means of in situ synchrotron X-ray diffraction and Raman spectroscopy under hydrostatic pressure, we investigate the structural stability of the quadruple perovskite LaMn7O12. At 34 GPa, the data unveil a first-order structural phase transition fr
Externí odkaz:
http://arxiv.org/abs/2102.09998
Autor:
Guarneri, L., Jakobs, S., von Hoegen, A., Maier, S., Cojocaru-Mirédin, O., Raghuwanshi, M., Drögeler, M., Stampfer, C., Lobo, R. P. S. M., Piarristeguy, A., Pradel, A., Xu, M., Wuttig, M.
The chemical bond is one of the most powerful, yet controversial concepts in chemistry, explaining property trends in solids. Recently, a novel type of chemical bonding has been identified in several higher chalcogenides, characterized by a unique pr
Externí odkaz:
http://arxiv.org/abs/2008.10219
Autor:
Xu, B., Cappelluti, E., Benfatto, L., Mallett, B. P. P., Marsik, P., Sheveleva, E., Lyzwa, F., Wolf, Th., Yang, R., Qiu, X. G., Dai, Y. M., Wen, H. H., Lobo, R. P. S. M., Bernhard, C.
Publikováno v:
Phys. Rev. Lett. 122, 217002 (2019)
By means of infrared spectroscopy we determine the temperature-doping phase diagram of the Fano effect for the in-plane Fe-As stretching mode in Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$. The Fano parameter $1/q^2$, which is a measure of the phonon coupling
Externí odkaz:
http://arxiv.org/abs/1810.10230
Autor:
Xu, B., Xiao, H., Gao, B., Ma, Y. H., Mu, G., Marsik, P., Sheveleva, E., Lyzwa, F., Dai, Y. M., Lobo, R. P. S. M., Bernhard, C.
Publikováno v:
Phys. Rev. B 97, 195110(2018)
We performed optical studies on CaFeAsF single crystals, a parent compound of the 1111-type iron-based superconductors that undergoes a structural phase transition from tetragonal to orthorhombic at $T_s$ = 121 K and a magnetic one to a spin density
Externí odkaz:
http://arxiv.org/abs/1805.03132
Autor:
Santos-Cottin, D., Klein, Y., Werner, Ph., Miyake, T., Medici, L. de', Gauzzi, A., Lobo, R. P. S. M., Casula, M.
Publikováno v:
Phys. Rev. Materials 2, 105001 (2018)
Optical conductivity measurements on a BaCoS2 single crystal show an unusual linear behavior over a broad spectral range. In the paramagnetic phase above 300 K, the spectrum shows no gap, which contradicts the previously proposed scenario of a charge
Externí odkaz:
http://arxiv.org/abs/1712.01539
Publikováno v:
Phys. Rev. B 96, 115125 (2017)
We measured the optical conductivity of superconducting single crystals of Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ with $x$ ranging from 0.40 (optimal doping, $T_c = 39$ K) down to 0.20 (underdoped, $T_c = 16$ K), where a magnetic order coexists with super
Externí odkaz:
http://arxiv.org/abs/1709.05485
Autor:
Xu, B., Dai, Y. M., Xiao, H., Shen, B., Ye, Z. R., Forget, A., Colson, D., Feng, D. L., Wen, H. H., Qiu, X. G., Lobo, R. P. S. M.
Publikováno v:
Phys. Rev. B 94, 085147 (2016)
In iron-based superconductors, a spin-density-wave (SDW) magnetic order is suppressed with doping and unconventional superconductivity appears in close proximity to the SDW instability. The optical response of the SDW order shows clear gap features:
Externí odkaz:
http://arxiv.org/abs/1608.05474
Autor:
Lobo, R. P. S. M., Buhot, J., Méasson, M. A., Aoki, D., Lapertot, G., Lejay, P., Homes, C. C.
Publikováno v:
Phys. Rev. B 92, 045129 (2015)
We measured the polarized optical conductivity of URu$_2$Si$_2$ from room temperature down to 5 K, covering the Kondo state, the coherent Kondo liquid regime, and the hidden-order phase. The normal state is characterized by an anisotropic behavior be
Externí odkaz:
http://arxiv.org/abs/1507.04555