17 research outputs found
Edith Helm to Senator James O. Eastland, 26 November 1947
Typed letter signed dated 26 November 1947 from Mrs. J.M. Helm, Secretary to Mrs. Truman, to Eastland, questionnaire for White House files.https://egrove.olemiss.edu/joecorr_b/1007/thumbnail.jp
Edith Helm to Senator James O. Eastland, 3 January 1947
Typed letter signed dated 3 January 1947 from Mrs. J.M. Helm, Secretary to Mrs. Truman, to Eastland, re: questionnaire for White House files.https://egrove.olemiss.edu/joecorr_b/1004/thumbnail.jp
The influence of magnetic order on the magnetoresistance anisotropy of FeCuTe
We performed resistance measurements on FeCuTe with
in the presence of in-plane applied magnetic fields,
revealing a resistance anisotropy that can be induced at a temperature far
below the structural and magnetic zero-field transition temperatures. The
observed resistance anisotropy strongly depends on the field orientation with
respect to the crystallographic axes, as well as on the field-cooling history.
Our results imply a correlation between the observed features and the
low-temperature magnetic order. Hysteresis in the angle-dependence indicates a
strong pinning of the magnetic order within a temperature range that varies
with the Cu content. The resistance anisotropy vanishes at different
temperatures depending on whether an external magnetic field or a remnant field
is present: the closing temperature is higher in the presence of an external
field. For the resistance anisotropy closes above the
structural transition, at the same temperature at which the zero-field
short-range magnetic order disappears and the sample becomes paramagnetic. Thus
we suggest that under an external magnetic field the resistance anisotropy
mirrors the magnetic order parameter. We discuss similarities to nematic order
observed in other iron pnictide materials.Comment: 11 pages, 9 figure