Playing With Jim Crow: African American Private Parks in Early Twentieth Century New Orleans

Public space in New Orleans became increasingly segregated following the 1896 U. S. Supreme Court decision in Plessy v. Ferguson. This trend applied to sites of recreation, as nearly all public parks in the city became segregated. African Americans turned, instead, to private parks. This work examines four private parks open to African Americans in order to understand the external forces that affected these spaces, leading to their success or closure, and their significance for black city residents. While scholars have argued public space in New Orleans was segregated during Jim Crow, little attention has been paid to African American parks as alternative spaces for black New Orleanians. Whites were able to control the location of the parks and the parks’ reliance on profit to survive resulted in short spans of existence for most. However, this thesis argues that these parks were crucial sites of identity and community formation and of resistance to segregation

Playing With Jim Crow: African American Private Parks in Early Twentieth Century New Orleans

Public space in New Orleans became increasingly segregated following the 1896 U. S. Supreme Court decision in Plessy v. Ferguson. This trend applied to sites of recreation, as nearly all public parks in the city became segregated. African Americans turned, instead, to private parks. This work examines four private parks open to African Americans in order to understand the external forces that affected these spaces, leading to their success or closure, and their significance for black city residents. While scholars have argued public space in New Orleans was segregated during Jim Crow, little attention has been paid to African American parks as alternative spaces for black New Orleanians. Whites were able to control the location of the parks and the parks’ reliance on profit to survive resulted in short spans of existence for most. However, this thesis argues that these parks were crucial sites of identity and community formation and of resistance to segregation

Interplay between Fe and Nd magnetism in NdFeAsO single crystals

The structural and magnetic phase transitions have been studied on NdFeAsO single crystals by neutron and x-ray diffraction complemented by resistivity and specific heat measurements. Two low-temperature phase transitions have been observed in addition to the tetragonal-to-orthorhombic transition at T_S = 142 K and the onset of antiferromagnetic (AFM) Fe order below T_N = 137 K. The Fe moments order AFM in the well-known stripe-like structure in the (ab) plane, but change from AFM to ferromagnetic (FM) arrangement along the c direction below T* = 15 K accompanied by the onset of Nd AFM order below T_Nd = 6 K with this same AFM configuration. The iron magnetic order-order transition in NdFeAsO accentuates the Nd-Fe interaction and the delicate balance of c-axis exchange couplings that results in AFM in LaFeAsO and FM in CeFeAsO and PrFeAsO.Comment: revised; 4 pages, 3 figures; accepted for publication in Phys. Rev.

Hole doping and antiferromagnetic correlations above the Néel temperature of the topological semimetal (Sr1-x Kx) MnSb2

Neutron diffraction and magnetic susceptibility studies of orthorhombic single crystal (Sr0.97K0.03)MnSb2 confirm the three-dimensional (3D) C-type antiferromagnetic (AFM) ordering of the Mn2+ moments at TN=305±3 K, which is slightly higher than that of the parent SrMnSb2 with TN=297±3 K. Susceptibility measurements of the K-doped and parent crystals above TN are characteristic of 2D AFM systems. This is consistent with high-temperature neutron diffraction of the parent compound that displays persisting 2D AFM correlations well above TN to at least ∼560 K with no evidence of a ferromagnetic phase. Analysis of the de Haas–van Alphen magnetic oscillations of the K-doped crystal is consistent with hole doping

Interplay of Fe and Nd magnetism in NdFeAsO single crystals

The structural and magnetic phase transitions have been studied on NdFeAsO single crystals by neutron and x-ray diffraction complemented by resistivity and specific-heat measurements. Two low-temperature phase transitions have been observed in addition to the tetragonal-to-orthorhombic transition at TS∼142 K and the onset of antiferromagnetic (AFM) Fe order belowTN∼137 K. The Fe moments order AFM in the well-known stripelike structure in the (ab) plane but change from AFM to ferromagnetic (FM) arrangement along the c direction below T∗∼15 K accompanied by the onset of Nd AFM order below TNd∼6 K with this same AFM configuration. The iron magnetic order-order transition in NdFeAsO accentuates the Nd-Fe interaction and the delicate balance of c-axis exchange couplings that results in AFM in LaFeAsO and FM in CeFeAsO and PrFeAsO.This article is from Physical Review B 82 (2010): 060514(R), doi:10.1103/PhysRevB.82.060514.</p