Dr. H. K. Singh

Experimental Condensed Matter Physics and Materials Physics

Education

M. Sc. (Physics) in First class (Magadh University, 1991), CSIR-UGC NET JRF 1992, GATE-92: 96.05 Percentile

Ph. D. (Synthesis, Characterization, and Device Fabrication of Some Hg and Tl Bearing High-Temperature Superconducting Films), (Centre of Advanced Study, Dept. of Physics, Banaras Hindu University, 2000) Broad Area: Condensed Matter Physics/Materials Physics, Specialization: Superconductivity and Magnetism

Supervisor: Prof. O. N. Srivastava

Research Areas

Magnetism and Superconductivity in Stronly Correlated systems at reduced mimensions, Heusler alloys, Low-Dimensional Systems, Thin Films, and Heterostructures, Quantum Metrology, Quantum Phenomena in Nanostructures, High Precision Electrical Transport Measurements

Research supervision

M.Sc./M. Tech. Supervised/Completed: 12, Ph.D. Supervised: 17

Recognized Ph. D. Guide (Outside AcSIR): Delhi University, Delhi Technological University, Banaras Hindu University, JAPYEE Institute of Information Technology

Research publications

Publications in SCI Journals: ~140 in SCI journals, Papers in Conference Proceedings: 14, Book chapters published: 5, Patents: 1 US Patent

Served as Assistant Professor of Physics at SGR PG College, Janunpur (1999-2002).

Served as a Scientist at CSIR–National Physical Laboratory, New Delhi, from 2002 to 2024, and retired as Chief Scientist in September 2024. Led the Quantum Resistance Metrology and 2D Physics Group for nearly a decade. Established India’s primary standard of resistance based on the quantum Hall effect in 2003, which was subsequently peer-reviewed and validated in 2005 and 2010.

Initiated and led thin-film research on strongly correlated doped rare-earth manganites, and later developed a comprehensive thin-film growth program at CSIR-NPL. This program encompassed a wide range of advanced materials, including manganites, Heusler alloys, topological insulators, and epitaxial graphene.

Solid State Physics, Electrodynamics, Optics, Quantum Theory of Nanostructures, Quantum Metrology, and Research Publications and Ethics, Thermal Physics

Life Member: Indian Physics Association and Metrology Society of India 

Selected Publications

Enhanced photodetection performance in ferroelectric-driven magnetron sputtered thin film p-Si/Ba(Pr)Ti(Mo,Nb)O₃/Ag devices, Deep Mala, C. B. Singh, S. Dahiya, A. K. Singh, B. N. Pal, Km. Alka, H. K. Singh, Optical Materials 2026

Surface Morphology-Dependent Photodetection of the Magnetron-Sputtered Nb-Doped BaTiO₃ Ferroelectric Thin Film Device, Deep Mala, C. B. Singh, S. Dahiya, A. K. Singh, B. N. Pal, Km. Alka, H. K. Singh, ACS Applied Optical Materials, 2026

Evolution of Ferromagnetism and Metallicity in RF magnetron sputtered Mn-Ni-Sn Heusler Alloy Thin Films, Annu Verma, Komal, J. Tanwar, P. Kushwaha, J. S. Tawale, P. K. Siwach, and H. K. Singh, Results in Surface and Interface 20 100616 (2025)

Heat-induced changes in bone and its crystal size: A comprehensive analysis by FTIR-ATR and XRD, A Srivastava, H K Singh, D Kumar, Forensic Science International, 378 112742 (2026)

Chromium-driven modifications of the structure-magnetism correlation in Mn_2-xCr_xNi_{1. 6}Sn_{0. 4} (x= 0, 0.2, 0.3, 0.4) bulk alloys synthesized by RF induction melting, Komal, Annu Verma, Jai Dev Tanwar, JS Tawale, Pallavi Kushwaha, PK Siwach, Nidhi Singh, HK Singh, J. Magnetism and Magnetic Materials, 630 173477 (2025)

Exploring Phase Transition Dynamics in VO₂ Films: The Role of Substrate Temperature, Akash Kumar Singh, Deependra Kumar Singh, H. K. Singh, PK Siwach, Current Applied Physics 76, 45 (2025)

Twinning and strain-induced modifications in insulator-metal transition and large magnetoresistance in La_0.67Ca_0.33MnO₃ films, B. Mohan, P. Manral, P. Chander, H. K. Singh, and V. K. Malik, J. Appl. Phys. 137, 015302 2025

Anomalous magnetotransport behavior and weak anti-localization in disordered Mn₂Ni_1.6Sn_0.4 Heusler alloy thin films, A. Verma, Komal, J. D. Tanwar, J. S. Tawale, P. Kushwaha, N. Singh, P. K. Siwach, and H. K. Singh, J. Mag. Magnetic Materials 614, 172702 (2025)

Tensile strain-induced disorder and weak localization in SrRuO₃ thin films on (100) KTaO₃ substrates, K. Alka, S. Chauhan, S. Singh, P. K. Siwach, and H. K. Singh, Physica Scripta 99, 125957 (2025)

Elucidation of annealing effects on austenite–martensite and magnetic phase transitions in Mn₂Ni_1.6Sn_0.4 ribbons synthesized from bulk alloys prepared by RF induction melting, Komal, Annu Verma, Jai Dev Tanwar, J. S. Tawale, Pallavi Kushwaha, Barsha Borgohain, P. K. Siwach, T. P. Yadav, and H. K. Singh, Journal of Magnetism and Magnetic Materials 603, 172270 (2024)

Interfacial layer effect on the enhancement of Gilbert damping in RF magnetron sputtered Y₃Fe₅O₁₂/Gd₃Ga₅O₁₂ thin films, S. Satapathy, P.K. Siwach, H.K. Singh, R.P. Pant, K.K. Maurya, Physica B: Condensed Matter 669, 415278 (2023)

Magnetotransport behavior of YBa₂Cu₃O_7-δ-Sm_0.55Sr_0.45MnO₃ superconducting-ferromagnetic composite thin films, S. Kumari, M. Anas, D.S. Raghav, S. Chauhan, P.K. Siwach, V.K. Malik, and H.K. Singh, Physica Scripta 97 075810 (2022)

Probing phase separation in Nd_1-xSr_xMnO₃ (x≈ 0.4, 0.5) polycrystals through temperature-dependent magnetic and Raman spectroscopy studies, A. Bhoriya, D.S. Raghav, N. Bura, D. Yadav, J. Singh, H.K. Singh, N.D. Sharma, Journal of Alloys and Compounds 894, 162424 (2022)

Interface-induced reemergent insulator-metal transitions in ferromagnetic/antiferromagnetic manganite superlattices, S. Chauhan, S. Kumari, P.K. Siwach, K.K. Maurya, V. Malik, and H.K. Singh, Physica E: Low-dimensional Systems and Nanostructures 128, 114573 (2021)

Journey of Kilogram from Physical Constant to Universal Physical Constant (h) via Artefact: A Brief Review, B. Ehtesham, T. John, S. Yadav, H.K. Singh, G. Mandal, and Nidhi Singh, MAPAN 35 585-593 (2020)

Magnetic-order induced effects in nanocrystalline NiO probed by Raman spectroscopy, N. Bala, H.K. Singh, S. Verma, S. Rath, Physical Review B 102 024423 (2020)

Magnetic phase profile in La_0.7Ca_0.3MnO₃/Pr_0.58Ca_0.42MnO₃ superlattices: role of substrate inherent disorders, S. Chauhan, S. Kumari, P.K. Siwach, K.K. Maurya, V. Malik, and H.K. Singh, J. Magnetism and Magnetic Materials, 499, 166284 (2019)

Suppression of Spin Glass Behavior in Phase Separated La_0.22Pr_0.40Ca_0.38MnO₃ by Nanostructuring, S. Kumari, S. Chauhan, D.S. Raghav, P.K. Siwach, G.D. Varma and H.K. Singh, IEEE Transactions on Magnetics 55, 1-7 (2019)

Bilateral comparison of 1 Ω and 10 kΩ standards (ongoing BIPM key comparisons BIPM.EM-K13.a and 13.b) between the NPLI (India) and the BIPM, N. Fletcher, R. Goebel, M. Saleem, H.K. Singh, M. A. Ansari, U. Kiran and A. K. Saxena, Metrologia 56 01007 (2019)

Martensitic ferromagnetism and spin glass behaviour in Ni₄₇Mn₃₆Cr₄Sn₁₃ ribbons, Barsha Borgohain, P.K. Siwach, Nidhi Singh, V.P.S. Awana, and H.K. Singh, Intermetallics 111 106492 (2019)

Magnetostructural properties and electric transport in Mn_48+xCr_3-xNi₃₈Sn₁₁ (x= 0, 1) ribbons: Mn/Ni ratio versus Cr doping, Barsha Borgohain, P.K. Siwach, N. Singh, H.K. Singh, J Magnetism and Magnetic Materials 454 13 (2018)

Binary Multifunctional Ultrabroadband Self?Powered g-C₃N₄/Si Heterojunction High Performance Photodetector, N. Prakash, G. Kumar, M. Singh, A. Barvat, P. Pal, S.P. Singh, H.K. Singh and S.P. Khanna, Advanced Optical Materials 6 1800191 (2018)

Structure, magnetism, and electrical transport in epitaxial La_0.23Pr_0.41Ca_0.36MnO₃ thin films: Consequences of film thickness, S. Singh, P.K. Tyagi, and H.K. Singh, AIP Advances 8 095002 (2018)

Quantifying phase separation in terms of magnetoresistive hysteresis loops in strongly phase-separated manganite thin films, S. Singh, P.K. Tyagi, and H.K. Singh, Applied Physics A 123, 677 (2017)

Understanding thermomagnetic hysteresis in La_1-x-yPr_yCa_xMnO₃ thin films, A. Yadav, S. Singh, A. Vashist, G. Sharma, P.K.  Siwach, H.K. Singh, Materials Research Express 4 086507 (2017)

Charge transport mechanism of thermally reduced graphene oxide and their fabrication for high-performance shield against electromagnetic pollution, R. Kumar, S.K. Dhawan, H.K. Singh, and A. Kaur, Materials Chemistry and Physics 180 413-421 (2016)

Magnetic anisotropy and anisotropic magnetoresistance in strongly phase-separated manganite thin films, L.M. Kandpal, S. Singh, P. Kumar, P.K. Siwach, A. Gupta, V.P.S. Awana and H.K. Singh, J. Magnetism and Magnetic Materials 408 60 (2016).

Structure and properties of electrodeposited functional Ni–Fe/TiN nanocomposite coatings, M. K. Tripathi, V. B. Singh and H. K. Singh, Surface and Coatings Technologies 278 146 (2015).

Multiple magnetic transitions, dynamical magnetic liquid, and magnetic glass in La_1-x-yPr_yCa_xMnO₃ (x»0.42, y»0.40) thin films: influence of strain and its relaxation, Vasudha Agarwal, Lalit M. Kandpal, P. K. Siwach, V. P. S. Awana and H.K. Singh, J. Magnetism and Magnetic Materials 394 299 (2015).

Crossover from charge order to strain glass in phase-separated manganite thin films: Impact of thermal cycling and substrate-induced strain, Vasudha Agarwal, P. K. Siwach, V. P. S. Awana, and H. K. Singh, Solid State Communications, 202 43 (2015).

Supercooling transition in phase separated manganite thin films: An electrical transport study, Sandeep Singh, P. Kumar, P. K. Siwach, P. K. Tyagi, and H. K. Singh, Applied Physics Letters 104, 212403 (2014).

Impact of strain on metamagnetic transitions in Sm_0.5Sr_0.5MnO₃ thin films, M. K. Srivastava, A. Kaur, K. K. Maurya, V. P. S. Awana, and H. K. Singh, Appl. Phys. Lett. 102, 032402 (2013)

Enhancement in magnetic and dielectric properties of La and Pr co-substituted BiFeO₃, A. Srivastava, H.K. Singh, V.P.S. Awana, O.N. Srivastava, Journal of Alloys and Compounds 552, 336 (2013).

Carrier localization and out-of-plane anisotropic magnetoresistance in Nd_0.55-xSm_xSr_0.45MnO₃ thin films, M.K. Srivastava, A. Kaur and H.K. Singh, Appl. Phys. Lett. 100, 222408 .(2012)

Low field anisotropic colossal magnetoresistance in Sm_0.53Sr_0.47MnO₃ thin films, M.K. Srivastava, M.P. Singh, A. Kaur, F.S. Razavi, and H.K. Singh, J. Applied Physics 110, 123922 (2011)

Out-of-plane anisotropic magnetoresistance in Nd_0.51Sr_0.49MnO₃ thin films, P. Kumar, R. Prasad, R.K. Dwivedi and H.K. Singh, J. Magnetism and Magnetic Materials 323 2564 (2011)

Enhanced ferromagnetic and metal-insulator transition in Sm_0.55Sr_0.45MnO₃ thin films: role of oxygen vacancy induced quenched disorder, M.K. Srivastava, P.K. Siwach, A. Kaur, and H.K. Singh, Appl. Phys. Lett. 97, 182503 (2010).

Impact of size mismatch induced quenched disorder on phase fluctuation and low field magnetotransport in polycrystalline Nd_0.58-xGd_xSr_0.42MnO₃, M.K. Srivastava, R. Prasad, P.K. Siwach, M.P. Singh, and H.K. Singh, J. Appl. Phys. 107, 09D726 (2010).

Evidence of substrate-induced charge order quenching, insulator-metal transition, and colossal magnetoresistance in polycrystalline Pr_0.58Ca_0.42MnO₃ thin films, V. Agarwal, M.P. Singh, R. Prasad, P.K. Siwach, P. Fournier, and H.K. Singh, Appl. Phys. Lett. 96, 052512 (2010).

Impact of magnetic phase coexistence on magnetotransport in polycrystalline Nd_0.51Sr_0.49MnO₃ thin films, H.K. Singh, P. Kumar, R. Prasad, M.P. Singh, V. Agarwal, P.K. Siwach and P. Fournier, J. Phys. D: Applied Physics 42 105009 (2009).

Anamalous insulator-metal transition and weak ferromagnetism in Nd_0.37Sr_0.67MnO₃ thin films, R. Prasad, M.P. Singh, P.K. Siwach, P. Fournier and H.K. Singh, Euro. Phys. Lett. 84 27003 (2008).

Low field magnetotransport in manganites, P.K. Siwach, O.N. Srivastava and H.K. Singh, J. Phys.: Condens. Matter 20 273201 (2008).

Thickness-dependent transport properties of compressively strained La_0.88Sr_0.12MnO₃ultrathin  films, R. Prasad, M.P. Singh, P.K. Siwach, W. Prellier, A. Kaur and H.K. Singh, J. Applied Physics, 103 083906 (2008).

Anomalous ferromagnetism in spray pyrolysis deposited BiFeO₃ thin films, P.K. Siwach, H.K. Singh, J. Singh and O.N. Srivastava, Appl. Phys. Letts. 91 122503 (2007).

Effect of large compressive strain on low-field electrical transport in La_0.88Sr_0.12MnO₃ thin films, R. Prasad, Anurag Gaur, P.K. Siwach, G.D. Varma, A. Kaur and H.K. Singh, Journal of Physics D: Applied. Physics 40 2954 (2007).

Magneto-transport characteristics of La_1.4Ca_1.6Mn₂O₇ thin film deposited by spray pyrolysis, P.K. Siwach, H.K. Singh and O.N. Srivastava, Journal of Physics D: Applied. Physics 39 3731 (2006).

Influence of strain relaxation on magnetotransport properties of epitaxial La_0.7Ca_0.3MnO₃ films, P.K. Siwach, H.K. Singh, and O.N. Srivastava, Journal of Physics: Condensed. Matter 18 9783 (2006).

The effect of Ba doping on structure and magneto-transport properties of layered manganite La_1.4Ca_1.6-xBa_xMn₂O_7, H K Singh, A K Gupta, P K Siwach, O N Srivastava, Journal of Magnetism and Magnetic Materials 292 483 (2005)

Preparation and study of silver added La_0.67Ca_0.33MnO₃ film N. Khare, D.P. Singh, H.K. Singh, A.K. Gupta, P.K. Siwach, O.N. Srivastava, Journal of Physics and Chemistry of Solids 65 867 (2004).

Effect of substrate on magneto-transport properties of polycrystalline manganite films, P.K. Siwach, D.P. Singh, H.K. Singh, N. Khare, A.K. Singh and O.N. Srivastava, Journal of Physics D: Applied Physics 36 1361 (2003).

On The Synthesis and Characterization of a New Manganite Type CMR Material: La_0.7Hg_0.3MnO₃, P.K. Siwach, H.K. Singh, N. Khare, A.K. Singh and O.N. Srivastava, Journal of Alloys & Compounds 350 56 (2002).

Reduction in conduction Noise of La-Ca-Mn-O polycrystalline films due to ag addition, N. Khare, H.K. Singh, U P. Moharil, A.K. Gupta and O.N. Srivastava, Journal of Applied Physics 89 3532 (2001).

Low field magnetoresistance of spray pyrolyzed La_0.67Ca_0.33MnO₃ thin films, H.K. Singh, N. Khare, P.K. Siwach and O.N. Srivastava, Journal of Physics D: Applied. Physics 33 921 (2000).

Investigations on Tl-2223 thin films fabricated through ultrasonic spray pyrolysis under oxygen-deprived conditions, H.K. Singh and O.N. Srivastava, Bulletin Materials Science 23 475 (2000).

R-F SQUID Effect in Hg(Tl)-Ba-Ca-Cu-O High T_c Thin Film up to 121K, N. Khare, A.K. Gupta, H.K. Singh and O.N. Srivastava, Superconductor Science Technology 11 517 (1998).

Cadmium-induced growth of 2223 phase and T_c enhancement in TBCCO High T_c thin films, H.K. Singh and O.N. Srivastava, Physics Letters A 240 253 (1998).

Hg(Tl)-Ba-Ca-Cu-O High T_c Thin Film R-F SQUID Operating above 115K, N. Khare, A.K. Gupta, S. Khare, H.K. Singh, A.K. Saxena and O.N. Srivastava, Physica C 274 161 (1997).

The Effect of Ag Doping on the Transition Temperature and the Critical Current Density of Hg_1-xTl_xBa₂Ca₂Cu₃O_8+d Films Fabricated through Spray Pyrolysis, H.K. Singh, A.K. Saxena and O.N. Srivastava, Physica C 273 180 (1997).

The Formation and Characterization of Tl Doped Hg-Ba-Ca-Cu-O Superconducting Films Synthesized through Spray Pyrolysis, H.K. Singh, A.K. Saxena and O.N. Srivastava, Physica C 262 1 (1996).

The Synthesis of Tl-Ba-Ca-Cu-O (Ag_y) HTSC Films through Spray Pyrolysis and an Evaluation of the Effect of Silver on the Critical Current Density, H.K. Singh, A.K. Saxena and O.N. Srivastava, Superconductor Science Technology 8 448 (1995).

Quantum Redefinition of Mass: The State of the Art, B. Ehtesham, T. John, H. K. Singh, and Nidhi Singh, Handbook of Metrology and Applications, 189-218, Handbook of Metrology and Applications, Springer-Singapore (2023).

Electrical and Electronics Metrology: From Quantum Standard to Applications in Industry and Strategic Sectors, Atul S Somkuwar et al., Metrology for Inclusive Growth of India (Ed. D.K. Aswal) 457-521, Springer-Singapore (2020)

Structural-Microstructural Characteristics and its Correlation with Physical Properties in High Temperature Superconducting Thin Films and Tapes, H.K. Singh, A. Asthana and O. N. Srivastava, Studies of High-Temperature Superconductor 33 Nova Science Inc., New York.

Synthesis and Electron Microscopic Investigation of Hg and Tl/Pb Doped Hg HTSC Phases in Bulk and Thin Film Forms, A.K. Srivastava, H.K. Singh and O.N. Srivastava, Studies of High-Temperature Superconductor 24 129-163, Nova Science Inc., New York (1997)

Hg-Ba-Ca-Cu-O High T_c Thin Films and Supeonducting Quantum Interference Devices, N. Khare, A.K. Gupta, S. Khare, H.K. Singh and O.N. Srivastava, Studies of High-Temperature Superconductor 24 111-127, Nova Science Inc., New York (1997)

P-toluenesulfonate doped polypyrrole/carbon composite electrode and a process for the preparation thereof, A. Kumar, H.K. Singh, R.K. Singh, R. Singh, P. Srivastava, US Patent 10,074,453 (2018)