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Egilmez M.,American University of Sharjah | Chow K.H.,University of Alberta | Macfarlane W.A.,University of British Columbia | Salman Z.,Laboratory for Muon Spin Spectroscopy | And 8 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2015

The local magnetic properties of Tm12Co 5Bi were investigated using muon spin relaxation (μSR), showing unusual magnetic features. Below 0.27 T, any magnetic transition in the sample occurs below ∼ 3 K while at 2.7 and 5 T, there is a magnetic transition in the range 10–30 K. These results constitute a possibility of a phase transition from an antiferromagnetic ground state to a short-ranged magnetic phase at the local level. © 2015, Springer Science+Business Media New York. Source

Martin N.,CEA Saclay Nuclear Research Center | Deutsch M.,CNRS Laboratory of Crystallography, Nuclear Magnetic Resonance and Modelling | Bert F.,University Paris - Sud | Andreica D.,Babes - Bolyai University | And 8 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2016

We have studied by muon spin resonance (μSR) the helical ground state and fluctuating chiral phase recently observed in the MnGe chiral magnet. At low temperature, the muon polarization shows double-period oscillations at short-time scales. Their analysis, akin to that recently developed for MnSi [A. Amato, Phys. Rev. B 89, 184425 (2014)PRBMDO1098-012110.1103/PhysRevB.89.184425], provides an estimation of the field distribution induced by the Mn helical order at the muon site. The refined muon position agrees nicely with ab initio calculations. With increasing temperature, an inhomogeneous fluctuating chiral phase sets in, characterized by two well-separated frequency ranges which coexist in the sample. Rapid and slow fluctuations, respectively, associated with short-range and long-range ordered helices, coexist in a large temperature range below TN=170 K. We discuss the results with respect to MnSi, taking the short helical period, metastable quenched state, and peculiar band structure of MnGe into account. © 2016 American Physical Society. Source

Bay T.V.,University of Amsterdam | Jackson M.,CNRS Neel Institute | Paulsen C.,CNRS Neel Institute | Baines C.,Laboratory for Muon Spin Spectroscopy | And 6 more authors.
Solid State Communications | Year: 2014

The low-field magnetic response of the non-centrosymmetric superconductor YPtBi (Tc=0.77K) is investigated. Ac-susceptibility and dc-magnetization measurements provide solid evidence for bulk superconductivity with a volume fraction of ~70%. The lower critical field is surprisingly small: Bc1=0.008mT (T→0). Muon spin rotation experiments in a transverse magnetic field of 0.01 T show a weak increase of the Gaussian damping rate σTF below Tc, which yields a London penetration depth λ=1.6±0.2μm. The zero-field Kubo-Toyabe relaxation rate σKT equals 0.129±0.004μs-1 and does not show a significant change below Tc. This puts an upper bound of 0.04 mT on the spontaneous magnetic field associated with a possible odd-parity component in the superconducting order parameter. © 2013 Elsevier Ltd. Source

Pregelj M.,Jozef Stefan Institute | Zorko A.,Jozef Stefan Institute | Zaharko O.,Laboratory for Neutron Scattering | Jeglic P.,Jozef Stefan Institute | And 8 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

The layered FeTe2O5Cl compound was studied by specific-heat, muon-spin relaxation, nuclear magnetic resonance, and dielectric as well as neutron and synchrotron x-ray diffraction measurements, and the results were compared to isostructural FeTe2O5Br. We find that the low-temperature ordered state, similarly as in FeTe2O5Br, is multiferroic: the elliptical amplitude-modulated magnetic cycloid and the electric polarization simultaneously develop below 11 K. However, compared to FeTe2O5Br, the magnetic elliptical envelope rotates by 75(4) and the orientation of the electric polarization is much more sensitive to the applied electric field. We propose that the observed differences between the two isostructural compounds arise from geometric frustration, which enhances the effects of otherwise subtle Fe3+ (S=52) magnetic anisotropies. Finally, x-ray diffraction results imply that, on the microscopic scale, the magnetoelectric coupling is driven by shifts of the O1 atoms, as a response to the polarization of the Te4+ lone-pair electrons involved in the Fe-O-Te-O-Fe exchange bridges. © 2013 American Physical Society. Source

Muramatsu T.,Osaka University | Muramatsu T.,University of Houston | Kanemasa T.,Osaka University | Kagayama T.,Osaka University | And 14 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We report the discovery of two consecutive, pressure driven magnetic instabilities in Yb2Pd2Sn. They emerge in a non-Fermi liquid environment at the initial and the final point of a dome-like, single magnetic phase at pressures pc14 GPa. This singular behavior of Yb compounds is supposed to result from mutually competing, pressure modified energy scales, which in case of Yb2Pd2Sn cause a sign change of the pressure dependence of the Kondo temperature TK and magnetic ordering temperature TN. © 2011 American Physical Society. Source

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