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Pressure-induced transition in the multiferroic CoCr[subscript 2]O[subscript 4] spinel
Abstract not provided
Pressure-induced spin reorientation and spin state transition in SrCoO[subscript 3]
Abstract not provided
Superconducting Bi 2 Te: Pressure-induced universality in the (Bi 2 ) m (Bi 2 Te 3 ) n series
Using high-pressure magnetotransport techniques we have discovered superconductivity in Bi 2 Te, a member of the infinitely adaptive (Bi 2 )m(Bi 2 Te 3 )n series, whose end members, Bi and Bi 2 Te 3 , can be tuned to display topological surface states or superconductivity. Bi 2 Te has a maximum T c = 8.6 K at P = 14.5 GPa and goes through multiple high pressure phase transitions, ultimately collapsing into a bcc structure that suggests a universal behavior across the series. High-pressure magnetoresistance and Hall measurements suggest a semi-metal to metal transition near 5.4 GPa, which accompanies the hexagonal to intermediate phase transition seen via x-ray diffraction measurements. In addition, the linearity of H c2 (T) exceeds the Werthamer-Helfand-Hohenberg limit, even in the extreme spin-orbit scattering limit, yet is consistent with other strong spin-orbit materials. Furthermore, considering these results in combination with similar reports on strong spin-orbit scattering materials seen in the literature, we suggest the need for a new theory that can address the unconventional nature of their superconducting states.
Raman scattering study of spin-density-wave-induced anisotropic electronic properties in A Fe 2 As 2 ( A = Ca , Eu)
We present a polarization-resolved and temperature-dependent Raman scattering study of AFe 2 As 2 (A = Ca, Eu). In the spin-density-wave phase, spectral weight redistribution is observed in the fully symmetric and nonsymmetric scattering channels at different energies. An anisotropic Raman response is observed in the fully symmetric channel in spontaneously detwinned CaFe 2 As 2 samples. We calculate the orbital-resolved electronic structures using a combination of density functional theory and dynamical mean field theory. We identify the electronic transitions corresponding to these two spectral features and find that the anisotropic Raman response originates from the lifted degeneracy of the d xz/yz orbitals in the broken-symmetry phase.
Stability of the M2 phase of vanadium dioxide induced by coherent epitaxial strain
Not Available
Pressure-induced phase transitions in the CdCr[subscript 2]Se[subscript 4] spinel
Abstract not provided
Multiple superconducting states induced by pressure in Mo 3 Sb 7
Tuning competing ordering mechanisms with hydrostatic pressure in the 4 d intermetallic compound Mo 3 Sb 7 reveals an intricate interplay of structure, magnetism, and superconductivity. Synchrotron x-ray diffraction and magnetic susceptibility measurements, both employing diamond anvil cell technologies, link a first-order structural phase transition to a doubling of the superconducting transition temperature. In contrast to the spin-dimer picture for Mo 3 Sb 7 , we deduce from x-ray absorption near-edge structure and dc magnetization measurements at ambient pressure that Mo 3 Sb 7 should possess only very small, itinerant magnetic moments. As a result, the pressure evolution of the superconducting transition temperature strongly suggests its enhancement is due to a difference in the phonon density-of-states with changed crystal symmetry.
Optical and structural study of the pressure-induced phase transition of CdWO 4
Not Available
Critical behavior of M g 1 – x F e x O at the pressure-induced iron spin-state crossover
Not Available