新型重费米子超导体简介

The normal-state susceptibility follows χ=χ0+C/(T-θ)
Upper critical field estimated to be about 74T
J. L. Sarrao et.al. Nature01212
Q u i t e h i g h Tc a s a h e a v y f e r m i o n s u p e r c o n d u c t o r
PES data under different light source
J. J. Joyce et.al. PhysRevLett.91.176401
Nuclear magnetic resonance measurement
NMR spectra at 19 K obtained by sweeping the external field H at a fixed frequency 32.5 MHz
S u s c e p t i b i l i t y, S p e c i f i c h e a t a n d U p p e r c r i t i c a l f i e l d
Open cycles represent samples of 2 month old Heat capacity measurements
Hall effect RH of a NpPd5Al2 single crystal ,with I=5 mA along the [100] direction, B=9 T along the [001] direction, and Hall voltage VH along the [010 ] direction.
Resistive curve of NpPd5Al2 , Tc=4.9K
NpPd5Al2 I4/mmm
Suppression of Tc by applying field
Dai Aoki et.al. JPSJ.76.063701
H a l l c o e f f i c i e n t & S e e b e c k e f f ect
Crystal Effective Field
P4/mmm space group
Theoretical calculation of the effect of CEF Bnm are CEF parameters
Takashi Hotta, Kazuo Ueda PhysRevB.67.104518
百度文库hotoemission spectrum
PSE data get trough He II (48.4 eV) lines compare with theoretic fits Generalized gradient approximation (GGA) and Mixed-level model (MLM) calculation are considered (Pu metal )f-electron postion centers are represented by solid bars
59Co
Nuclear spin-lattice relaxation rate divided by T, as a function of T For comparison, NMR of the nonmagnetic metal LuCoGa5 is presented
S.-H. Baek et.al. PhysRevLett.105.217002
(c) Energy band structure for PuCoGa5 obtained by the RLAPW method. (d)
Takahiro Maehira et.al. PhysRevLett.90.207007
S t r u c t u r e a n d c o n d u c t i v i t y o f N p Pd 5A l 2
The schematic phase diagram for the alloy system PuMGa5 g represents the generic coupling parameter
The highest Tc among heavy fermionions
J. D. Thompson et.al. arXiv:cond-mat/0509078v1 Yunkyu Bang et.al. arXiv:cond-mat/0603042v2
Calculated band structure and Fermi surface
Calculated four Fermi surface of the bands across EF ： (a) (b) One small hole sheet centered at the Γ point. A large cylindrical hole sheet centered at the Γ point, while two equivalent small hole sheets are centered at X points. A large cylindrical electron sheet centered at the M point. Another cylindrical electron sheet centered at the M point.
Crystal Effective Field
Calculation of the three crystal field states with the β which maximizes the overlap of the Γ 7± with the nearby ligand atoms
Rebecca Flint, P. Coleman et.al Nature Physics 4, 643 - 648 (2008)
Seebeck coefficient S(t), with heat current J along [100]
J.C. Griveau et.al. PhysRevB.77.212502