عنوان

High-Pressure Investigations of Correlated-Electron Phenomena

شماره

TL32s9x56t

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

High-Pressure Investigations of Correlated-Electron Phenomena

نام عام مواد

[Thesis]

نام نخستين پديدآور

Wolowiec, Christian

نام ساير پديدآوران

Maple, M. Brian

تاریخ نشرو بخش و غیره

2017

کسي که مدرک را اعطا کرده

Maple, M. Brian

امتياز متن

2017

متن يادداشت

This dissertation includes a discussion of the results of measurements of electrical resistivity for materials under applied pressure extending over a range in pressures from 0 to 27 GPa and temperatures from 1 to 300 K. The primary effect of applying pressure to a solid is to reduce the interatomic distance and to increase the overlap of the electronic orbitals. The secondary effects of applying pressure to a solid include the delocalization of electrons and a broadening of the energy bands. In addition, the application of pressure can induce a variety of transitions, both electronic and structural. Some of the phenomena observed during the pressure experiments reported in this dissertation include the pressure-induced enhancement of the superconducting transition temperature in a recently discovered class of bismuth-sulfide layered superconductors, the anomalous "dome-like" behavior in the pressure dependence of the Néel temperature in the first-known synthesis of an itinerant antiferromagnetic metal with non-magnetic constituents TiAu, and the evolution of the pressure-induced first-order transition to antiferromagnetism in the Fe-substituted heavy fermion compound URu2Si2. These and other results including a semiconductor-metal transition in the normal state of one of the bismuth-sulfide layered superconducting compounds are a consequence of the electronic and structural transitions that can occur as a result of the application of pressure. The theoretical context for the experimental results includes a discussion of the effect of pressure on the relevant parameters in condensed matter theory including the density of states, the exchange interaction in both the localized and itinerant models of magnetism, and the electron-phonon coupling parameter, among others. In particular, the pressure dependence of the magnetic ordering temperature and the superconducting transition temperature in various materials can be explained in terms of how the few parameters listed above respond to pressure.

مستند نام اشخاص تاييد نشده

Kou, Yubo

مستند نام اشخاص تاييد نشده

Wolowiec, Christian

مستند نام تنالگان تاييد نشده

UC San Diego

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y