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Title: Probing the f-state configuration of URu 2Si 2 with U L III-edge resonant x-ray absorption spectroscopy

It has often been said that the most interesting physics occurs when competing interactions are of nearly the same magnitude. Such a situation is surely occurring at URu 2Si 2’s so-called “hidden-order transition”, which garners its name from the missing entropy at a 17.5 K phase transition relative to that expected for a conventional antiferromagnetic phase transition, despite the presence of only a very small ordered magnetic moment. Despite this discrepancy being identified in 1985, the identification of the order parameter remains elusive, although progress toward understand- ing this transition has been steady since that time, and URu 2Si 2 remains an important research subject today. The work described provides measures of the 5f orbital occupancy and itinerancy using resonant x-ray emission spectroscopy (RXES) at the U L III absorption edge and measuring U L α1 emission that potentially acts as a dividing line between different classes of “hidden-order” theories.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
1240934
Report Number(s):
LLNL-TR-678981
TRN: US1600691
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; F STATES; X-RAY SPECTROSCOPY; ENTROPY; EMISSION SPECTROSCOPY; ORDER PARAMETERS; PHASE TRANSFORMATIONS; ANTIFERROMAGNETISM; MAGNETIC MOMENTS; TEMPERATURE RANGE 0013-0065 K; URANIUM SILICIDES; RUTHENIUM SILICIDES