Statistical Model for Dilute Ferromagnetism

Ferromagnetism, glassiness, and metastability in a dilute dipolar-coupled magnet.

%e have measured the ac magnetic susceptibility of the model dilute dipolar-coupled Ising system LiHo„Y& -„F4. The x 0.46 material displays an ordinary ferromagnetic transition, while the x 0.045 and 0.167 samples are two very different magnetic glasses. Thermal relaxation times are more than five times longer for x 0.167 than for x ~0.045. In addition, the more concentrated glass shows history...

Itinerant ferromagnetism in a Fermi gas with contact interaction: Magnetic properties in a dilute Hubbard model

Chia-Chen Chang,1 Shiwei Zhang,1,2,3 and David M. Ceperley4 1Department of Physics, College of William and Mary, Williamsburg, VA 23187, USA 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 3Department of Physics, Renmin University of China, Beijing 100872, China 4Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA (Received 7 Septem...

A New Model for Text Coherence Evaluation using Statistical Characteristics

the innovation of a statistical model to estimate dependable rainfall (dr) and develop it for determination and classification of drought and wet years of iran

آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...

Ferromagnetism in dilute magnetic semiconductors through defect engineering: Li-doped ZnO.

We demonstrate, both theoretically and experimentally, that cation vacancy can be the origin of ferromagnetism in intrinsic dilute magnetic semiconductors. The vacancies can be controlled to tune the ferromagnetism. Using Li-doped ZnO as an example, we found that while Li itself is nonmagnetic, it generates holes in ZnO, and its presence reduces the formation energy of Zn vacancy, and thereby s...