Spin-fluctuation drag thermopower of nearly ferromagnetic metals.

نویسنده

  • Takuya Okabe
چکیده

We investigate theoretically the Seebeck effect in materials close to a ferromagnetic quantum critical point to explain anomalous behaviour at low temperatures. It is found that the main effect of spin fluctuations is to enhance the coefficient of the leading T-linear term, and a quantum critical behaviour characterized by a spin-fluctuation temperature appears in the temperature dependence of the correction terms as in the specific heat.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Spin fluctuations in nearly magnetic metals from ab - initio dynamical spin susceptibility calculations : application to Pd and Cr

Spin fluctuations in nearly magnetic metals from ab-initio dynamical spin susceptibility calculations: application to P d and Cr 95 V 5 Abstract We describe our theoretical formalism and computational scheme for making ab-initio calculations of the dynamic paramagnetic spin susceptibilities of metals and alloys at finite temperatures. Its basis is Time-Dependent Density Functional Theory within...

متن کامل

Sensitivity of the Superconducting Transition Temperature to Changes in the Spin-Fluctuation Spectral Weight

In the simplest model of magnetic pairing, the transition temperature to the superconducting state depends on the dynamical susceptibility χ(q, ω). We discuss how Tc is affected by different momentum and frequency parts of χ(q, ω) for nearly antiferromagnetic and nearly ferromagnetic metals in two dimensions. While in the case of phonon-mediated superconductivity any addition of spectral weight...

متن کامل

Spin drag in an ultracold fermi gas on the verge of ferromagnetic instability.

Recent experiments [Jo, Science 325, 1521 (2009)] have presented evidence of ferromagnetic correlations in a two-component ultracold Fermi gas with strong repulsive interactions. Motivated by these experiments we consider spin drag, i.e., frictional drag due to scattering of particles with opposite spin, in such systems. We show that when the ferromagnetic state is approached from the normal si...

متن کامل

Anisotropic and incommensurate spin fluctuations in hcp iron and some other nearly magnetic metals

Anisotropic and incommensurate spin fluctuations in hcp iron and some other nearly magnetic metals. Abstract We present an ab initio theoretical formalism for the static paramagnetic spin susceptibility of metals at finite temperatures. Since relativistic effects, e.g. spin-orbit coupling, are included we can identify the anisotropy or easy axes of the spin fluctuations. Our calculations find h...

متن کامل

خواص مغناطیسی نانولوله گالیوم آرسناید زیگزاگ (0,9) آلایش‌یافته با عناصر واسطه

of 3d transition metals (Sc, Ti, Cr, Mn , Fe, Co, Ni) in both far and close situations were studied based on spin polarised density functional theory using the generalized gradient approximation (LDA) with SIESTA code. The electronic structures show that zigzag (0,9) GaAs nanotubes are non-magnetic semiconductors with direct band gap. It was revealed that doping of 11.11 % Fe and Mn concentrati...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Journal of physics. Condensed matter : an Institute of Physics journal

دوره 22 11  شماره 

صفحات  -

تاریخ انتشار 2010