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Title: Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe 2Ge 2

Abstract

In this study, we investigated the occurrence and nature of superconductivity in single crystals of YFe 2Ge 2 grown out of Sn flux by employing X-ray diffraction, electrical resistivity and specific heat measurements. We found that the residual resistivity ratio (RRR) of single crystals can be greatly improved, reaching as high as ~60, by decanting the crystals from the molten Sn at ~350°C and/or by annealing at temperatures between 550°C and 600°C. We found that the samples with RRR ≳ 34 showed resistive signatures of superconductivity with the onset of the superconducting transition T c ≈ 1.4K. RRR values vary between 35 and 65 with, on average, no systematic change in value T c, indicating that the systematic changes in RRR do not lead to comparable changes in T c. Specific heat measurements on samples that showed the clear resistive signatures of a superconducting transition did not show any signature of a superconducting phase transition, which suggests that the superconductivity observed in this compound is either some sort of filamentary, strain-stabilized superconductivity associated with small amounts of stressed YFe 2Ge 2 (perhaps at twin boundaries or dislocations) or is a second crystallographic phase that is present at level below detectionmore » capability of conventional powder X-ray techniques.« less

Authors:
 [1];  [2];  [1];  [2];  [2];  [2];  [2];  [2]
  1. Iowa State Univ., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States); Ames Lab. (AMES), Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1233220
Report Number(s):
IS-J-8515
Journal ID: ISSN 1478-6435
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Philosophical Magazine (2003, Print)
Additional Journal Information:
Journal Name: Philosophical Magazine (2003, Print); Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 1478-6435
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; crystal growth; superconductivity

Citation Formats

Kim, H., Ran, S., Mun, E. D., Hodovanets, H., Tanatar, M. A., Prozorov, R., Bud’ko, S. L., and Canfield, P. C.. Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe2Ge 2. United States: N. p., 2015. Web. doi:10.1080/14786435.2015.1004378.
Kim, H., Ran, S., Mun, E. D., Hodovanets, H., Tanatar, M. A., Prozorov, R., Bud’ko, S. L., & Canfield, P. C.. Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe2Ge 2. United States. doi:10.1080/14786435.2015.1004378.
Kim, H., Ran, S., Mun, E. D., Hodovanets, H., Tanatar, M. A., Prozorov, R., Bud’ko, S. L., and Canfield, P. C.. Thu . "Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe2Ge 2". United States. doi:10.1080/14786435.2015.1004378. https://www.osti.gov/servlets/purl/1233220.
@article{osti_1233220,
title = {Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe2Ge 2},
author = {Kim, H. and Ran, S. and Mun, E. D. and Hodovanets, H. and Tanatar, M. A. and Prozorov, R. and Bud’ko, S. L. and Canfield, P. C.},
abstractNote = {In this study, we investigated the occurrence and nature of superconductivity in single crystals of YFe2Ge2 grown out of Sn flux by employing X-ray diffraction, electrical resistivity and specific heat measurements. We found that the residual resistivity ratio (RRR) of single crystals can be greatly improved, reaching as high as ~60, by decanting the crystals from the molten Sn at ~350°C and/or by annealing at temperatures between 550°C and 600°C. We found that the samples with RRR ≳ 34 showed resistive signatures of superconductivity with the onset of the superconducting transition Tc ≈ 1.4K. RRR values vary between 35 and 65 with, on average, no systematic change in value Tc, indicating that the systematic changes in RRR do not lead to comparable changes in Tc. Specific heat measurements on samples that showed the clear resistive signatures of a superconducting transition did not show any signature of a superconducting phase transition, which suggests that the superconductivity observed in this compound is either some sort of filamentary, strain-stabilized superconductivity associated with small amounts of stressed YFe2Ge2 (perhaps at twin boundaries or dislocations) or is a second crystallographic phase that is present at level below detection capability of conventional powder X-ray techniques.},
doi = {10.1080/14786435.2015.1004378},
journal = {Philosophical Magazine (2003, Print)},
number = 7,
volume = 95,
place = {United States},
year = {Thu Feb 05 00:00:00 EST 2015},
month = {Thu Feb 05 00:00:00 EST 2015}
}

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Cited by: 9 works
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