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Title: Doping dependence of the magnitude of fluctuating spin moments in the normal state of the pnictide superconductor Sr ( F e 1 - x C o x ) 2 A s 2 inferred from photoemission spectroscopy

Abstract

We report systematic temperature- and doping-dependent measurements of the Fe3s core-level photoemission spectra in the normal state of superconducting Sr(Fe1-xCox)2As2. The analysis of the Fe3s spectrum provides an element-specific determination of the mean value of the magnitude of the Fe spin moment measured on the fast (10-16-10-15s) timescale of the photoemission process. The data reveal the ubiquitous presence in the normal state of Fe spin moments with magnitude fluctuating on short timescales. The data reveal a significant reduction of the magnitude of the effective Fe spin moment on going from the parent to the optimal doped compound. The doping dependence of the magnitude of the spin moment at higher doping level is less clear, being either constant, or even nonmonotonic, depending on temperature. This phenomenology indicates the importance of the interaction between spin and itinerant degrees of freedom in shaping the properties of the normal state. These findings reaffirm the complexity of the normal state of 122 Fe-pnictides, which are typically viewed as the least correlated of the high-temperature unconventional superconductors.

Authors:
 [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [3];  [3];  [4];  [5];  [6];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Shanghai Jiao Tong Univ. (China)
  5. I-Lamp and Universita Cattolica del Sacro Cuore
  6. Univ. of Missouri, Columbia, MO (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566976
Alternate Identifier(s):
OSTI ID: 1507605; OSTI ID: 1571995
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231; SC0019114
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Vilmercati, P., Kim, Yeongkwan, Mo, Sung-Kwan, McGuire, Michael A., Sales, Brian C., Mandrus, David, Ku, Wei, Sangaletti, Luigi, Singh, David, and Mannella, Norman. Doping dependence of the magnitude of fluctuating spin moments in the normal state of the pnictide superconductor Sr(Fe1-xCox)2As2 inferred from photoemission spectroscopy. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.155132.
Vilmercati, P., Kim, Yeongkwan, Mo, Sung-Kwan, McGuire, Michael A., Sales, Brian C., Mandrus, David, Ku, Wei, Sangaletti, Luigi, Singh, David, & Mannella, Norman. Doping dependence of the magnitude of fluctuating spin moments in the normal state of the pnictide superconductor Sr(Fe1-xCox)2As2 inferred from photoemission spectroscopy. United States. doi:10.1103/physrevb.99.155132.
Vilmercati, P., Kim, Yeongkwan, Mo, Sung-Kwan, McGuire, Michael A., Sales, Brian C., Mandrus, David, Ku, Wei, Sangaletti, Luigi, Singh, David, and Mannella, Norman. Thu . "Doping dependence of the magnitude of fluctuating spin moments in the normal state of the pnictide superconductor Sr(Fe1-xCox)2As2 inferred from photoemission spectroscopy". United States. doi:10.1103/physrevb.99.155132. https://www.osti.gov/servlets/purl/1566976.
@article{osti_1566976,
title = {Doping dependence of the magnitude of fluctuating spin moments in the normal state of the pnictide superconductor Sr(Fe1-xCox)2As2 inferred from photoemission spectroscopy},
author = {Vilmercati, P. and Kim, Yeongkwan and Mo, Sung-Kwan and McGuire, Michael A. and Sales, Brian C. and Mandrus, David and Ku, Wei and Sangaletti, Luigi and Singh, David and Mannella, Norman},
abstractNote = {We report systematic temperature- and doping-dependent measurements of the Fe3s core-level photoemission spectra in the normal state of superconducting Sr(Fe1-xCox)2As2. The analysis of the Fe3s spectrum provides an element-specific determination of the mean value of the magnitude of the Fe spin moment measured on the fast (10-16-10-15s) timescale of the photoemission process. The data reveal the ubiquitous presence in the normal state of Fe spin moments with magnitude fluctuating on short timescales. The data reveal a significant reduction of the magnitude of the effective Fe spin moment on going from the parent to the optimal doped compound. The doping dependence of the magnitude of the spin moment at higher doping level is less clear, being either constant, or even nonmonotonic, depending on temperature. This phenomenology indicates the importance of the interaction between spin and itinerant degrees of freedom in shaping the properties of the normal state. These findings reaffirm the complexity of the normal state of 122 Fe-pnictides, which are typically viewed as the least correlated of the high-temperature unconventional superconductors.},
doi = {10.1103/physrevb.99.155132},
journal = {Physical Review B},
number = 15,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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