Magnetization distribution in the tetragonal Ba(Fe1−xCox)2As2, x=0.066 probed by polarized neutron diffraction

نویسندگان

  • K. Prokeš
  • A. Gukasov
  • D. N. Argyriou
  • S. L. Bud’ko
  • P. C. Canfield
  • A. Kreyssig
  • A. I. Goldman
چکیده

Polarized neutron diffraction has been performed on a tetragonal Ba(Fe1−xCox)2As2, x= 0.066 single crystal under an applied magnetic field of 6T directed along the [110] direction to determine the magnetic structure factors of various Bragg reflections. The maximum entropy reconstruction based on bulk magnetization measurements and polarized neutron diffraction data reveal a small induced magnetic moment residing on the 4d Wyckoff site that is occupied by Fe/Co atoms. No significant magnetization density has been found on the Ba and As atomic positions. The small polarizability of Fe/Co sites leads to flipping ratios very close to 1.00. Our data suggest a non-zero orbital contribution to the Fe/Co magnetic form factor in good agreement with recent theoretical and experimental studies. open access Copyright c © EPLA, 201

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

Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe1−xCox)2As2

Critical current density was studied in single crystals of Ba Fe1−xCox 2As2 for the values of x spanning the entire doping phase diagram. A noticeable enhancement was found for slightly underdoped crystals with the peak at x=0.058. Using a combination of polarized-light imaging, x-ray diffraction and magnetic measurements we associate this behavior with the intrinsic pinning on structural domai...

متن کامل

Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba(Fe(1-x)Co(x))2As2.

We use a quantitative convergent beam electron diffraction based method to image the valence electron density distribution in Ba(Fe1-xCox)2As2. We show a remarkable increase in both the charge quadrupole of the Fe cations and the charge dipole of the arsenic anions upon Co doping from x=0 (Tc=0  K) to x=0.1 (Tc=22.5  K). Our data suggest that an unexpected electronic correlation effect, namely ...

متن کامل

Contrasting spin dynamics between underdoped and overdoped Ba(Fe1-xCox)2As2.

We report the first NMR investigation of spin dynamics in the overdoped nonsuperconducting regime of Ba(Fe1-xCox)2As2 up to x=0.26. We demonstrate that the absence of interband transitions with large momentum transfer Q{AF} approximately (pi/a,0) between the hole and electron Fermi surfaces results in complete suppression of antiferromagnetic spin fluctuations for x greater than or approximatel...

متن کامل

Jump in specific heat at the superconducting transition temperature in Ba(Fe1â‹TMxCox)2As2 and Ba(Fe1â‹TMxNix)2As2 single crystals

We present detailed heat capacity measurements for Ba(Fe1−xCox)2As2 and Ba(Fe1−xNix)2As2 single crystals in the vicinity of the superconducting transitions. The specific-heat jump at the superconducting transition temperature (Tc), ΔCp/Tc, changes by a factor of ∼10 across these series. The ΔCp/Tc vs Tc data of this work [together with the literature data for Ba(Fe0.939Co0.061)2As2, (Ba0.55K0.4...

متن کامل

Millimeter-wave surface impedance of optimally-doped Ba(Fe1−xCox)2As2 single crystals

Millimeter-wave surface impedance of optimally-doped Ba(Fe1−xCox)2As2 single crystals A. Barannik,1 N. T. Cherpak,1,* M. A. Tanatar,2 S. Vitusevich,3 V. Skresanov,1 P. C. Canfield,2,4 and R. Prozorov2,4,† 1Solid State Radiophysics Department, Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkiv, Ukraine 2Ames Laboratory, Ames, Iowa 50011, USA 3Peter Grünbe...

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:

دوره   شماره 

صفحات  -

تاریخ انتشار 2011