المؤلفون: Banda, J., Hafner, D., Landaeta, J. F., Hassinger, E., Mitsumoto, K., Giovannini, M., Sereni, J. G., Geibel, C., Brando, M.

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: We present here a rare example of electronuclear quantum criticality in a metal. The compound YbCu4.6Au0.4 is located at an unconventional quantum critical point (QCP). In this material the relevant Kondo and RKKY exchange interactions are very weak, of the order of 1 K. Furthermore, there is strong competition between antiferromagnetic and ferromagnetic correlations, possibly due to geometrical frustration within the fcc Yb sublattice. This causes strong spin fluctuations which prevent the system to order magnetically. Because of the very low Kondo temperature the Yb3+ 4f-electrons couple weakly with the conduction electrons allowing the coupling to the nuclear moments of the 171Yb and 173Yb isotopes to become important. Thus, the quantum critical fluctuations observed at the QCP do not originate from purely electronic states but from entangled electronuclear states. This is evidenced by the anomalous temperature and field dependence of the specific heat at low temperatures.
Comment: 10 pages, 8 figures

الوصول الحر: http://arxiv.org/abs/2308.15294Test

المؤلفون: Sereni, J. G., Čurlik, I., Reiffers, M., Goivannini, M.

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: Magnetic, thermal and transport properties of the non-centrosymmetric compound Eu$_2$Pd$_2$Sn are revisited after including new measurements. In its paramagnetic phase, the outstanding feature of this compound is the formation of Eu$^{2+}$ dimers that allows to understand the deviation of the magnetic susceptibility $\chi(T)$ from the C-W law below about 70\,K, the field dependent magnetization $M(B)$ variation below $\approx 80$\,K and the reduced entropy at the ordering temperature $S(T_N)= 0.64R\ln(8)$. A significant change of the exchange interactions occurs between $T\approx 70$\,K (where $\theta_P = 18$\,K) and $T_N = 13.3$\,K (where $\theta_P =-4.5$\,K). The strong electronic overlap, arising from the reduced Eu-Eu spacing compared with that of pure Eu$^{2+}$ is expected to power these quasiparticles formation, inducing a significant reformulation of the magnetic structure. A rich magnetic phase diagram is obtained from the analysis of the derivatives of the magnetic parameters: $\partial \chi/\partial T$ and $\partial M/\partial B$, and the field dependence of the specific heat. Two critical points are recognized and a tentative description of the magnetic structures is proposed. The possible formation of a skyrmion lattice, that arises from the presence of magnetically frustrated pockets in the phase diagram, is suggested by theoretical studies on hexagonal structures exhibiting similar interactions pattern.
Comment: 13 pages, 11 figures

الوصول الحر: http://arxiv.org/abs/2207.08969Test

المؤلفون: Kneidinger, F., Zeiringer, I., Siderenko, A., Bauer, E., Michor, H., Rogl, P., Sereni, J. G.

المصدر: Phys. Rev. B 100, 134442 (2019)

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: Magnetic ($\chi$), transport ($\rho$) and heat capacity ($C_m$)properties of CeIrSi are investigated to elucidate the effect of geometric frustration in this compound with trillium type structure because, notwithstanding its robust effective moment, $\mu_{\rm eff}\approx 2.46\mu_B$, this Ce-lattice compound does not undergo a magnetic transition. In spite of that it shows broad $C_m(T)/T$ and $\chi(T)$ maxima centered at $T_{max}\approx 1.5$\,K, while a $\rho \propto T^2$ thermal dependence, characteristic of electronic spin coherent fluctuations, is observed below $T_{coh} \approx 2.5$\,K. Magnetic field does not affect significantly the position of the mentioned maxima up to $\approx 1$\,T, though $\chi(T)$ shows an incipient structure that completely vanishes at $\mu_0 H \approx 1$\,T. Concerning the $\rho \propto T^2$ dependence, it is practically not affected by magnetic field up to $\mu_0 H = 9$\,T, with the residual resistivity $\rho_0(H)$ slightly decreasing and $T_{coh}(H)$ increasing. These results are compared with the physical properties observed in other frustrated intermetallic compounds
Comment: 8 pages, 7 figures

الوصول الحر: http://arxiv.org/abs/1906.00832Test

المؤلفون: Correa, V. F., Asiares, A. G. Villagrán, Betancourth, D., Encina, S., Pedrazzini, P., Cornaglia, P. S., García, D. J., Sereni, J. G., Maiorov, B., Canales, N. Caroca, Geibel, C.

المصدر: Phys. Rev. B 100, 184409 (2019)

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: A very strong magnetoelastic effect in the CeCo$_{1-x}$Fe$_{x}$Si alloys is reported. The strength of the magnetostrictive effect can be tuned upon changing $x$. The moderate low-temperature linear magnetostriction observed at low Fe concentrations becomes very large ($\frac {\Delta L}{L} \left(16 T,2 K\right) =$ 3$\times$10$^{-3}$) around the critical concentration ($x_c \approx$ 0.23) at which the long-range antiferromagnetic order vanishes. Upon increasing doping through the non-magnetic region ($x > x_c$), the magnetostriction strength gradually weakens again. Remarkably the low-temperature magnetostriction at the critical concentration shows a pronounced $S$-like shape (centered at $B_m \sim$ 6 T) resembling other well-known Ce-based metamagnetic systems like CeRu$_2$Si$_2$ and CeTiGe. Unlike what is observed in these compounds, however, the field dependence of the magnetization shows only a minor upturn around $B_m$ vaguely resembling a metamagnetic behavior. The subtle interplay between magnetic order and the Kondo screening seems to originate an enhanced valence susceptibility slightly changing the Ce ions valence, ultimately triggering the large magnetostriction observed around the critical concentration.
Comment: 6 pages, 6 figures

الوصول الحر: http://arxiv.org/abs/1903.01383Test

المؤلفون: Sereni, J. G., Roberts, J., Gastaldo, F., Giovannini, M.

المصدر: Phys. Rev. B 100, 054421 (2019)

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: Shastry-Sutherland lattice was observed as alternative ground state in Rare Earth intermetallic with Mo$_2$B$_2$Fe and U$_2$Pt$_2$Sn anisotropic structures where magnetic frustration is favored. In the case of Ce$_2$Pd$_2$Sn, it was shown that such phase can be suppressed by the application of magnetic field and, in this work, its stability is studied as a function of the electronic concentration by doping the Sn(4+) lattice with In(3+) atoms. Magnetic and specific heat measurements show that around 50\% substitution the Shastry Sutherland lattice vanishes in a critical point. This result confirms the strong dependence of that phase on the electron density because a recent investigation on the Pd rich solid solution Ce$_{2+\epsilon}$Pd$_{2-\epsilon}$In$_{1-x}$Sn$_x$ (with $\epsilon < 0$) demonstrates that atomic disorder dominates the phase diagram at intermediate Sn/In concentration inhibiting magnetic frustration effects. In the alloys investigated in this work, the $\epsilon >0$ character stabilizes the ferromagnetic ground state all along the concentration, allowing the Shastry Sutherland lattice formation on the Sn rich side.
Comment: 5 pages, 6 figures

الوصول الحر: http://arxiv.org/abs/1902.04540Test

المؤلفون: Martinelli, A., Giovannini, M., Sereni, J. G., Ritter, C.

المصدر: J. Phys.: Condens. Matter 30 (2018) 265601

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: The ground state magnetic behaviour of Ce2(Pd0.8Ag0.2)2In and Ce2(Pd0.5Ag0.5)2In, found in the ferromagnetic branch of Ce2Pd2In, has been investigated by neutron powder diffraction at low temperature. Ce2(Pd0.8Ag0.2)2In is characterized by a ferromagnetic structure with the Ce moments aligned along the c-axis and values of 0.96(2) mB. The compound retains the P4/mbm throughout the magnetic transition, although the magnetic ordering is accompanied by a significant decrease of the lattice strain along [00l], suggesting a magnetostructural contribution. The magnetic behaviour of Ce2(Pd0.5Ag0.5)2In is very different; this compound exhibits an extremely reduced magnetic scattering contribution in the diffraction pattern, that can be ascribed to a different kind of ferromagnetic ordering, with extremely reduced magnetic moments (~ 0.1 mB) aligned along [0l0]. These results point to a competition between different types of magnetic correlations induced by Ag-substitution, giving rise to a magnetically frustrated scenario in Ce2(Pd0.5Ag0.5)2In.
Comment: to be published in Journal of Physics: Condensed Matter

الوصول الحر: http://arxiv.org/abs/1805.10023Test

المؤلفون: Sereni, J. G., Curlík, I., Giovannini, M., Strydom, A., Reiffers, M.

المصدر: Phys. Rev. B 98, 094420 (2018)

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: The physical properties of the very heavy fermion YbCu$_4$Ni were characterized through structural, magnetic, thermal and transport studies along nearly four decades of temperature ranging between 50 milikelvin and 300 K. At high temperature, the crystal electric field levels splitting was determined with $\Delta_1 (\Gamma_6)= 85$ K and $\Delta_2 (\Gamma_8) \approx 200$ K, the latter being a quartet in this cubic symmetry. An effective magnetic moment $\mu_{eff} \approx 3\mu_B$ is evaluated for the $\Gamma_7$ ground state, while at high temperature the value for a Yb$^{3+}$ ion is observed. At low temperature this compounds shows the typical behavior of a magnetically frustrated system undergoing a change of regime at a characteristic temperature $T^*\approx 200$ mK into a sort of Fermi-liquid type 'plateau'of the specific heat: $C_m/T|_{T\to 0}$ = const. The change in the temperature dependence of the specific heat coincides with a maximum and a discontinuity in respective inductive and dissipative components of the ac-susceptibility. More details from the nature of this ground state are revealed by the specific heat behavior under applied magnetic field.
Comment: 8 pages, 8 figures

الوصول الحر: http://arxiv.org/abs/1805.08051Test

المؤلفون: Gastaldo, F., Gabani, S., Džubinská, A., Reiffers, M., Pristáš, G., Čurlík, I., Skyba, P., Clovecko, M., Vavrek, F., Sereni, J. G., Giovannini, M.

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: We report on synthesis, crystal structure, magnetic, thermodynamic and transport properties of the new compound YbPd$_2$In, crystallizing as a Heusler structure type. A trivalent state of the rare earth was determined by fitting the magnetic susceptibility with a Curie-Weiss law. This compound is characterized by showing very weak magnetic interactions and a negligible Kondo effect. A specific heat jump was observed at $T\approx 250$ mK, followed at higher temperature by a power law decrease of $C_P(T)/T$. The resulting large electronic entropy increase at very low temperature is rapidly shifted to higher temperature by the application of magnetic field. This magnetocaloric effect places YbPd$_2$In as a very good candidate for adiabatic demagnetization cooling processes.
Comment: 5 pages, 5 figures

الوصول الحر: http://arxiv.org/abs/1711.02335Test

المؤلفون: Martinelli A., Ryan D. H., Sereni J. G., Ritter C., Curlik I., Giovannini M.

المساهمون: Martinelli, A., Ryan, D. H., Sereni, J. G., Ritter, C., Curlik, I., Giovannini, M.

الوصف: The structural and magnetic properties of the noncentrosymmetric Eu2Pd2Sn compound have been investigated by synchrotron x-ray and neutron powder diffraction and Eu151 Mössbauer spectroscopy. No structural transition was observed in the temperature range 4-290 K. The magnetic phase that develops below ∼13.8(5) K is characterized by an incommensurate cycloidal ordering in the ac plane of the Eu substructure. This magnetic structure shows significant analogies to the structure observed in EuNiGe3, possibly indicating the occurrence of a skyrmion lattice for Eu2Pd2Sn as well.

وصف الملف: STAMPA

العلاقة: volume:109; firstpage:104424; lastpage:104430; numberofpages:7; journal:PHYSICAL REVIEW. B; https://hdl.handle.net/11567/1173555Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85188547388

الإتاحة: https://doi.org/10.1103/PhysRevB.109.104424Test
https://hdl.handle.net/11567/1173555Test

المؤلفون: Correa, V. F., Betancourth, D., Sereni, J. G., Caroca-Canales, N., Geibel, C.

مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons

الوصف: We report a detailed study of the magnetic properties of CeCo$_{0.85}$Fe$_{0.15}$Si under high magnetic fields (up to 16 Tesla) measuring different physical properties such as specific heat, magnetization, electrical resistivity, thermal expansion and magnetostriction. CeCo$_{0.85}$Fe$_{0.15}$Si becomes antiferromagnetic at $T_N \approx$ 6.7 K. However, a broad tail (onset at $T_X \approx$ 13 K) in the specific heat precedes that second order transition. This tail is also observed in the temperature derivative of the resistivity. However, it is particularly noticeable in the thermal expansion coefficient where it takes the form of a large bump centered at $T_X$. A high magnetic field practically washes out that tail in the resistivity. But surprisingly, the bump in the thermal expansion becomes a well pronounced peak fully split from the magnetic transition at $T_N$. Concurrently, the magnetoresistance also switches from negative to positive just below $T_X$. The magnetostriction is considerable and irreversible at low temperature ($\frac {\Delta L}{L} \left(16 T\right) \sim$ 4$\times$10$^{-4}$ at 2 K) when the magnetic interactions dominate. A broad jump in the field dependence of the magnetostriction observed at low $T$ may be the signature of a weak ongoing metamagnetic transition. Taking altogether, the results indicate the importance of the lattice effects in the development of the magnetic order in these alloys.
Comment: 5 pages, 6 figures

الوصول الحر: http://arxiv.org/abs/1604.03985Test