Orbital magneto-electronic heat capacity of hydrogenated graphene in the presence of dilute charged impurity

2017 ◽  
Vol 31 (08) ◽  
pp. 1750053 ◽  
Author(s):  
Mohsen Yarmohammadi ◽  
Houshang Araghi Kazzaz ◽  
Mohammad Saeed Feali
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Function Technique ◽  
Charged Impurity ◽  
Electronic Heat Capacity ◽  
Orbital Contribution ◽  
Hydrogenated Graphene ◽  
Self Consistent ◽  
Impurity Doping ◽  
Electronic Heat

In this paper, the effect of dilute charged impurity and external magnetic field on orbital-resolved density of states (DOS) and electronic heat capacity (EHC) of a monolayer hydrogenated graphene which is called chair-like graphane is investigated within the Harrison model and Green’s function technique. The self-consistent Born approximation has been implemented to describe the effect of scattering between electrons and dilute charged impurities. Our results show that the graphane is a semiconductor and its band gap decreases with impurity and magnetic field. EHC reaches almost linearly to Schottky anomaly and does not change at low temperatures in the presence of impurity and magnetic field. Generally, EHC increases with the mentioned parameters. Surprisingly, impurity doping only affects the salient behavior of [Formula: see text] orbital contribution of carbon atoms due to the symmetry breaking.

scholarly journals Magnetic-field-controlled spin fluctuations and quantum critically in Sr3Ru2O7

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
C. Lester ◽  
S. Ramos ◽  
R. S. Perry ◽  
T. P. Croft ◽  
M. Laver ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Inelastic Neutron Scattering ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Continuous Phase ◽  
Spin Fluctuations ◽  
Electronic Heat Capacity ◽  
Electronic Heat

AbstractWhen the transition temperature of a continuous phase transition is tuned to absolute zero, new ordered phases and physical behaviour emerge in the vicinity of the resulting quantum critical point. Sr3Ru2O7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field Bc it displays the hallmark T-linear resistivity and a $$T\,{{{{{{\mathrm{log}}}}}}}\,(1/T)$$ T log ( 1 / T ) electronic heat capacity behaviour of strange metals. However, these behaviours have not been related to any critical fluctuations. Here we use inelastic neutron scattering to reveal the presence of collective spin fluctuations whose relaxation time and strength show a nearly singular variation with magnetic field as Bc is approached. The large increase in the electronic heat capacity and entropy near Bc can be understood quantitatively in terms of the scattering of conduction electrons by these spin-fluctuations. On entering the spin-density-wave ordered phase present near Bc, the fluctuations become stronger suggesting that the order is stabilised through an “order-by-disorder” mechanism.

scholarly journals Schottky anomaly and Néel temperature treatment of possible perturbed hydrogenated AA-stacked graphene, SiC, and h-BN bilayers

RSC Advances ◽  
2019 ◽  
Vol 9 (71) ◽  
pp. 41569-41580 ◽  
Author(s):  
Bui D. Hoi ◽  
Le T. T. Phuong ◽  
Vo T. Lam ◽  
Doan Q. Khoa ◽  
Tran Tien ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Heat Capacity ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Temperature Treatment ◽  
Electronic Heat Capacity ◽  
Néel Temperature ◽  
Schottky Anomaly ◽  
Electronic Heat ◽  
Pauli Susceptibility

The potential of manipulating the electronic heat capacity and Pauli susceptibility of hydrogenated AA-stacked graphene, silicon carbide, and hexagonal boron nitride bilayers is studied.

Magnetic ordering and enhanced electronic heat capacity in insulatingL2RuO5(L=Pr,Nd, Sm, Gd, and Tb)

2001 ◽  
Vol 63 (14) ◽  
Author(s):  
G. Cao ◽  
S. McCall ◽  
Z. X. Zhou ◽  
C. S. Alexander ◽  
J. E. Crow ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetic Ordering ◽  
Electronic Heat Capacity ◽  
Electronic Heat
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