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RISS 인기검색어
- 검색키워드
- 저자 : Reschke, Stephan (검색결과 3 건)
- 무료
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Electronic and phonon excitations in α−RuCl3
Reschke, S.,Mayr, F.,Wang, Zhe,Do, Seung-Hwan,Choi, K.-Y.,Loidl, A. American Physical Society 2017 Physical Review B Vol.96 No.16
<P>We report on terahertz (THz), infrared reflectivity, and transmission experiments for wavenumbers from 10 to 8000 cm(-1) (similar to 1meV-1eV) and for temperatures from 5 to 295 K on the Kitaev candidate material alpha-RuCl3. As reported earlier, the compound under investigation passes through a first-order structural phase transition, from a monoclinic high-temperature to a rhombohedral low-temperature phase. The phase transition shows an extreme and unusual hysteretic behavior, which extends from 60 to 166 K. In passing this phase transition, in the complete frequency range investigated, we found a significant reflectance change, which amounts to almost a factor of two. We provide a broadband spectrum of dielectric constant, dielectric loss, and optical conductivity from the THz to the mid-infrared regime and study in detail the phonon response and the low-lying electronic density of states. We provide evidence for the onset of an optical energy gap, which is on the order of 200 meV, in good agreement with the gap derived from measurements of the dc electrical resistivity. Remarkably, the onset of the gap exhibits a strong blue shift on increasing temperatures.</P>
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Sub-gap optical response in the Kitaev spin-liquid candidate <i>α</i>-RuCl<sub>3</sub>
Reschke, Stephan,Mayr, Franz,Widmann, Sebastian,von Nidda, Hans-Albrecht Krug,Tsurkan, Vladimir,Eremin, Mikhail V,Do, Seung-Hwan,Choi, Kwang-Yong,Wang, Zhe,Loidl, Alois IOP 2018 Journal of physics, an Institute of Physics journa Vol.30 No.47
<P>We report detailed optical experiments on the layered compound <I>α</I>-RuCl<SUB>3</SUB> focusing on the THz and sub-gap optical response across the structural phase transition from the monoclinic high-temperature to the rhombohedral low-temperature structure, where the stacking sequence of the molecular layers is changed. This type of phase transition is characteristic for a variety of tri-halides crystallizing in a layered honeycomb-type structure and so far is unique, as the low-temperature phase exhibits the higher symmetry. One motivation is to unravel the microscopic nature of THz and spin-orbital excitations via a study of temperature and symmetry-induced changes. The optical studies are complemented by thermal expansion experiments. We document a number of highly unusual findings: A characteristic two-step hysteresis of the structural phase transition, accompanied by a dramatic change of the reflectivity. A complex dielectric loss spectrum in the THz regime, which could indicate remnants of Kitaev physics. Orbital excitations, which cannot be explained based on recent models, and an electronic excitation, which appears in a narrow temperature range just across the structural phase transition. Despite significant symmetry changes across the monoclinic to rhombohedral phase transition and a change of the stacking sequence, phonon eigenfrequencies and the majority of spin-orbital excitations are not strongly influenced. Obviously, the symmetry of a single molecular layer determines the eigenfrequencies of most of these excitations. Only one mode at THz frequencies, which becomes suppressed in the high-temperature monoclinic phase and one phonon mode experience changes in symmetry and stacking. Finally, from this combined terahertz, far- and mid-infrared study we try to shed some light on the so far unsolved low energy (<1 eV) electronic structure of the ruthenium 4<I>d</I> <SUP>5</SUP> electrons in <I>α</I>-RuCl<SUB>3</SUB>.</P>
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Have you Exposure to a trauma and No PTSD? Which factors help and which are not?
Asanka Bulathwatta,Evelin Witruk,Konrad Reschke 한국식품보건융합학회 2019 식품보건융합연구 (KJFHC) Vol.5 No.1
Exposure to a traumatic events gives people many post traumatic conditions resulting Post Traumatic Stress Disorder (PTSD) or Post Traumatic Growth (PTG). Some of them may come up with acute Stress Disorder and some may having with grievances. But most of people overcome their traumatic condition with using their Emotional Intelligence and Resilience capacities. This article is focused on indicating basic mechanisms and resources in which can be lead to have better social rehabilitation along with the matters that can be important in trauma coping. The later part of the article appeals the concept of social work theory highlighting the psych dynamic approach which can be impact positively on psycho social rehabilitation. Traumatic experiences are really unpredictable and it can be resulted Post Traumatic Stress Disorders, Post traumatic growth in the end. But developing skills that required to overcoming trauma is facilitated by the Emotional Intelligence, Resilience, and Coping capacities that people having with. Exposure to a traumatic experience and not having a PTSD is determined by the many other factors such as social support system and government facilitation of the wellbeing afterwards the trauma. Here in this article the basic components of Emotional Intelligence, Resilience, and coping mechanisms have been considered as the major factors.
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