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

Vilmercati, P.; Kim, Yeongkwan; Mo, Sung-Kwan; McGuire, Michael A.; Sales, Brian C.; Mandrus, David; Ku, Wei; Sangaletti, Luigi; Singh, David; Mannella, Norman

doi:10.1103/physrevb.99.155132

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

Journal Article · Thu Apr 18 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.155132· OSTI ID:1566976

Vilmercati, P. ^[1]; Kim, Yeongkwan ^[2]; Mo, Sung-Kwan ^[2];

^[3];

^[3]; Mandrus, David ^[3]; Ku, Wei ^[4]; Sangaletti, Luigi ^[5]; Singh, David ^[6]; Mannella, Norman ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Shanghai Jiao Tong Univ. (China)
I-Lamp and Universita Cattolica del Sacro Cuore
Univ. of Missouri, Columbia, MO (United States)

We report systematic temperature- and doping-dependent measurements of the Fe 3s core-level photoemission spectra in the normal state of superconducting Sr(Fe_1-xCo_x)₂As₂. The analysis of the Fe 3s 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; SC0019114

OSTI ID:: 1566976

Alternate ID(s):: OSTI ID: 1507605; OSTI ID: 1571995

Journal Information:: Physical Review B, Vol. 99, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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